l::"IGrUE 217.-'Tag;elns gibbns, (p. 673;) natural size.218.-'ragelus divisus, (p. 67G;) natural size.219.-Callista convextlJ, (p. 681;) natural size.220.-"'.rottenia genlma, (p. 682;) enlarged.2Z1.-Cumingia tellinoides, (p. 67J;) natnTal size.222.-:~rfacomafragilis, var. fusca, (p. 676;) natural ~iz~~.

223.-Angulus tener, (p. 677;) natural size.224.-Angulus tenelluA, (p. 677 ;) natural size.225.-Tellina tenta, (p. 678;) natural size.226.-Kellia planulata, (p. 688;) enlarged.227.-Argina pexata, (p. 692;) natural size.228.-Scapharca transversa, (p. 691;) natural size.229.-Nucula delphinodonta, (p. 691 ;) enlarged.230.-Nucula proxilna, (p. 691;) natural size.231.-Yoldia sapotilla, (p. 6~9 ;) natural size.232.-Y oIdia IimatllIa, (p. 689;) natural size.

Fig. 225.~

Fig. 223.

Fig. 221

Fig. 2~iO.

Plate XXX.

Fig. 231.

Fig. 218.

Fig. 220.

Fig. 232.

Fig. 222.

Fig. 224.

Fig. 229.

Fig. 227.

Fig. 219.

Fig 217.

Fig. 228.

FIGrUE 233.-Crenella glandula, (p. 695.)234.-Mytilus edulis, (p. 692.)235.-Modiolaria corrugata, (p. 694.)236.-Modiolaria nigra, (p. 694.)237.-Modiola modiolus, (p. 69:3.)238.-l\fodiola plicatula, (p. 693.)

(All the fignres are of natural size, an!l froln Billlley'~ Gould, .Ira \\'U by 1~. S. Morse.)

J.;'Inrn)~ 2:J9.-A.llonlia acnleata, (p. G97 ;) lo,ver side, llfitllral size.240.-orhe saIne, upper side.~40a.-rrbeSallle, portions of the n ppel' sitle luagnified.241.-Anomia glahra, (p. 696;) profile vie,Y, natural size.242.-rrhe same, (p. 696 ;) lower side.~42a.-The sanIe, (p. 696;) S'oung, natural size.243.-Peeten irradiuns, (p. 695;) natural size.244.-Siliqua costata, (p. 675;) natural size.245.-Ensatel1a Americana, (p. 674 ;) natural size.

(The figures are frorn ninTl(>Y'~ nonlt1. dra'wn h.y I~. S. -.:\forsf'.)

Fig. 239. • Fig. 240.

Pl~~~XXII.

Fig. 244.

~'ig. 241.

:Fig. 242.

Fig. 242a.

Fig. 245.

EXPLAN-,-,,-TION OF PLl-\TE XXXIII.

FIGUHE 246.-Cynthia partita, variety stellifera, (p. 701;) natural size.247.-Cynthia carnea, (p. 701;) natural size.24A.-The same, (p. 701;) younger specimens, natural size.249.-Eugyra pilularis, (p. 700 ;) natural size.250.-Molgula Manhattensis, (p. 699 ;) smooth variety, natural size.251.-~Iolgulaarenata, (p. 699;) natural size.252.-Botryllus Gouldii, (p. 702;) colony incrusting the stem of Tubnlaria,

somewhat enlarged.253.-The same; one of the zooids, enlarged ten diameters; a, anal tube and ori­

fice; 8, somach; g, groove and vessels along the edge of the branchialsac, inside; 0, left ovary; b, bud, attached by a slender stolon.

254.-Salpa Cabotti, (p. 706;) solitary individual, from the dorsal side, enlarged;h, heart; 8, small chain of salpre budding within the old one.

255.-The same; one of the individuals from a mature chain, three-quarterview enlarged; a, posterior or anal opening; b, anterior or branchialopening; 0, processes by which the individuals of the chain wereunited; h, heart; n, nervous ganglion; 0, nucleus; r, gill.

2G6.-Escharella variabilis, (p. 71~) ;) few of the cells., much enlarged.

(Figure 256 waR drawn by A... II.yatt; 234 and 255 were copied fro:n A. AgassIz; the others weredrawn by A. E. Verrill.)

Fig. 246.

~~~~~1~

lfig.254.

Fig. 247.

Fig. 249.

X XXIII.Plate .....

Fig. 248.

Fig. 251.

750

Fig. 255.

7:"H

Eugyra749

I!"ig. 253.

Fig. 252.

Fig. 256.

So. 7f};~

EXPL.L~NAr-r-'rON OF PLATE XXXI\T.

}~IGURE 257.-Alcyonidium l'al1l0SUlll, (p. 703;) a ~young unbranched specimen, enlargedt,,,"o diameters.

258.-Bngula turrita, (p. 712;) extremity of a branch, enlarged.259.-The same; a branchlet more highly magnified.259a.-The salue; a lJranchlet bearing ovicells.260.-Crisia eburnea, (p. 707;) a cluster of branches, enlarged.261.-'rhe same; a branch bearing an o,icell, more higbly magnified.262.-Meinbranipora pilosa, (p. 712 j) a fe\v of the cells, seen froln above,

magnified.262a.-The same; a single cell, seen in profile.263.-'rhe same; one of the zooids expanded.264.-~loI1iahyalina, (p. 713 ;) one of the zooids in expansion, highly nlaguified.

(Figures 257,259, 259a were drawn by A. E. \errill; the rest were furnished by A. Hyatt.)

Plate XXXIV.

Fig. 25ft

No. 766

Fig. 263.

Fig. 259. Fig. 25Ha.

I

Fig. 201.

No. 772

Fig. 260

No. 769 No. 77)

Fig. 2;>7.

754

Fig. 262.

No, 768

~"ig. 2fl2a.Eig.264.

No. 773

EXPLANATION OF PL.ATE XXXV.

FIGURE 265.-Leptosynapta Girardii, (p. 716;) anterior part of the body, enlarged one­balf.

266.-The same; perforated plates from the skin, and the "anchors," highlymagnified. .

267.-Echinarachnius parma, (p. 717 ;) upper surface with the spines partlyremoved, natural size; a, ambulacral zones; b, interambulacralzones.

268.-Strongylocentrot1l8 Drobachiensis, (p. 716;) side view, natural size.269.-Asterias arenicola, (p. 718;) dorsal view, somewhat reduced.270.-0phiopholis aculeata, (p. 719;) dorsal view" about one-half natural size

(Fi~llres 265, 266 were draWD by A... E. Verrill; 267, 269 were copied from A. Agassiz; 268, 270 weredrdwn by E. S. Morse.)

Fig. 207. Fig. 270.

617

Fig. 269.

R~~].6C,:;"!. ~

lJ.~~"'fff':::s,~./J'-!li.~~~,{,-,lJ~'

~~i3ff~~\)f)/j.'j/J+~;::,~:g1fI,t(}i:~(Il,,~·i;lcf{::r$ \.~~if!.ft!~'! \i'l~{))l;c.

~, 'jg~({", ..~{/g,f" (~1')~,W'f:~~__" ~,,,,, .3"'" ~>~~$~i'~~'~£'!l',"~'" ~~'Ii.gg3·::~ ,,,~:JJ:~""~.'~~;1~~:~~~".g~~~~~\J,\~.i ~'.~g,~ ,'.\;%'i~.r;.1i~?~.~,~.;.~.f#!.~fJ~.<,4,~~~~.",~W*&!~Ji#~"'i.q,'P;>~"(>~<'(~;";'~~'9~%~i%~jf~~~~~i~~~t~li~~~'

IHV",'JJI~IL".;i' r'./,0q.;'jx:?R:;''f:.......if..~ .....''.....•

"l;2~l IN'':''~'''''"'''. J( '(\1':,;;<~\~\~\~,,~~\,\~~\\

Fig'. 265.

Gl.6

Fig'.2fi6.

EXPLANATION OF PLATE XXXV"I.

FIGURE 271.-Aurelia flavidula, (p. 72:3;) upper side, about one-fourth the naturalsize.

272.-Dactylometra quinquecirra, (p. 724;) lateral view, one-fourth the naturalsize.

273.-Corymorpha pendula, (p. 736;) natural size.274.-Parypha crocea, (p. 736;) natural size.

(Fignre 272 was copied from A. Agassiz, Catalogue Acalephs j the others were copied from L. Agassiz,Contributions to Natural History of United StateR.)

Fig:. 271.

Fig. 272.

1\0. 0140

Plate XXXVI.

Fig. 273.

No. 608

Fig. 274.

-=------.:::::No. 607

FIGL'RE 275.-Zygodactyla Gr(l~nlandica, (p. 729;) profile vie","', one-half natural size,276.-Bou~ainvilliasuperciliaris, (p. 733;) a branch, llluch enlarged.277.-Pennaria tiarella, (p. 735;) a branch, natural size.278.-Tbe saIne; one of the hydroids, with medusro, buds developing at the

base of the proboscis.279.-Sertularia pumila, (p. 732;) part of a colony on a frond of sea-weed

natural size.280.-Sertularia argentea, (p. 732;) a branch bearing reproductive capsules

(gonothecre,) with the soft parts removed, much enlarged.281.-0belia commissuralis, (p. 728;) a branch bearing h~Tdroids and one

female gonotheca, much enlarged.

(Fi~nreA 27;> and 279 were copied from A. Agassiz; 276 and ~81 frolll T.J ...A.gassiz; 278 from J. I ..eidy ;77 and 280 'were dr~.l\vn by A. E. Verrill.)

Plate XXXVII.

Fig. 2.f'.

No. 606

No. 610

Fia;.277.

611

No.6U4

Fig. 278.

Fig. 280.

No. 612

Fig. 279.

No. 603

Fig. 281.

EXPI~AN-1~TION OF PLATE XXXVIII.

FIGURE 282.-H~ylJoCO<l0l1prolifer, (p. 736 ;) natural size, the head seen from the backside.

283.-Alcyonium carneuill, (p. 737;) three of the polyps ful1y_ expanded, muchenlarged.

284.-Sagartia leucolena, (p. 738;) natural size, in expansion, but the tentacles. are not fully extended; the '* indicates the long odd tentacle.

28r>.-Halocampa producta, (p. 7:38;) natural size, ,veIl expanded, but the bodymay be much more elongated.

286.-Epizoanthus Anlericanus, (p. 740;) a colony which. hac1 completely cov­ered and absorbed a shell occupied by a hermit-crab, (Eupagnruspubescens,) which still lived ,vithin the cavity; the pol~rps are notexpanded, natural size.

287.-The same; one of the polyps in full expansion, natural size.

(Figure 282 was copied from L. AgRssiz; 286 :8 fron) tbe A.meI'ican Naturalist, drawn by E. S. Morse;the rest 'were drawn by A. E. VeITH1.)

Fig. 283.

:No. 598

Fig:. ~84.

.Fig. 2~7.

}i"ip;.286.

Plate XXXVIII.

Fig. 282.

Fig. 285.

No. 600