2 22

4. SCUTUS CORRUGATUS, Reeve. Parrnophorus corrugatus, Reeve, Proc. Zool. SOC. 1842 ; Conch.

Hub. -? Mus. Cuming.

5. SCUTUS TUMIDUS, Quoy et Gaimard. Parmophorus turnidus, Quop et Gaim. Voy. de l'Astro1. pl. 69. f. G.

-Parm. gibbosus, Anton.-? Parm. breviculus, Blainv. Bull. des Sci. 1817 ; Sowerby's Gen. (Emarg.) fig. 2.

Hub. Madagascar. Mus. Cuming.

G. SCUTUS IMBRICATUS, Quoy et Gaimard.

Syst. pl. 139. f. 1 .

Parinophorus imbricatus, Quoy ct Gaim. Voy. de l'Astrol. pl. 69.

Hab. Island of Burias. Mus. Cuniing. f. 17, 18.

7. SCUTUS ANGUSTATUS, A . Adam. S. testd elongatd, subqua- drangulari, luteribus angustatis, coarctatis; dorso plano, con- centrice striato, vertice subcentrali, postice declinato ; extremi- f a t e anticd sinuatd, posticd excurvatd, subelevatd.

H u b . Eastern Seas. Rlus. Cuming.

5 . A MONOGRAPH OF THE GENUS MONOPTYGMA OF LEA. BY ARTHUR ADAMS, R.N., F.L.S. ETC.

Genus MONOPTYGMA, J. Lea. (1 Menestho, Mull.) Animal unknown. Shell subulately turreted, transversely striated, apex simple, acute ;

aperture oval, longer than wide, rounded and entire in front ; colu- mella with a single oblique fold.

This genus differs from Actaox in being elongated, and in having an oblique fold, instead of a transverse plait on the columella.

1 . MONOPTKGMA STRIATA, Gray. M. testd turrito-subulutd, so- lidd, olivaceif, uizfractibus plunk, transversim sulcatis, subcis profundis, distaiitibus ; aperturd oblongd, intus albd.

This species, which is typical, is a very thick and strong shell, with a somewhat convex lateral outline, and strongly transversely grooved across the flattened whorls. Mus. Cuming.

2. MONOPTYGMA FULVA, A. Adams. M. testd turrito-subulatd, graciliori, solidd, fulvd, anfractibus planis, fransaersim sulcatis, sulcis profundis, distantibus ; aperturd oblongd, intus fused.

This elegantly-formed shell is more slender than M. striata, and of a different colour; the transverse grooves are also much closer together, and their edges are rounded ; the twist of the columella is not so distinct, and the aperture is brown internally. Mus. Cuming.

M . fcstd ovato-tur- ritd, nfbd, solid$, anfrcictibus plattiitscit f is, gradatis, longif i d ' -

3. MONOPTYGMA GRANULATA, A. Adams.

223

naliter eorrugato-plicatis, transversim sulcatis, sulcis profundis, valde distantibus ; interstitiis lcevibus ; aperturd oblongd, C O I I L - ntelld plicd subproductd.

This is a rather short and obtuse white and solid species, very strongly grooved transversely, and with the whorls longitudinally corrugately plicated. Mus. Cuming.

M. testd turrito-subulatd, albitlci, tenui, subpellucidd, anfractibus planiusculis, longitudi- naliter eleganter striatis, transversim sulcatis, sulcis distanti- bus, interstitiis crenulatis ; aperturd oblongd, columelld obliqud et curvatd.

A very beautifnlly-sculptured species, dredged from 10 fathoms, at Bolinao, by Mr. Cuming ; the outline is subulated, and the whorls rather flattened and longitudinally striated.

5. MONOPTYGMA AMCENA, A. Adams. M. testd ovato-acuminafd, tenui, subpellucidd, albidi, longitudinaliter substriatd, anfrac- tibus convexiusculis, transversim sulcatis, sulcis valdi. distanti- bus, interstitiis eleganter punctatis ; aperturil oblongd, antzce dilatatil, colunzelld recta.

This is a most exquisite species, both in form and sculpture ; the whorls are rounded and punctate-striate, and the shell is nearly pel- lucid ; it is from Bolinao, 10 fathoms water.

6. MONOPTYGMA CASTA, A. Adams. M. testd ovato-turritd, alM, tenui, sernipellucidd, anfractibus convexiusculis, transversim sul- catis, sulcis subconfertis, interstitiis pulcherrirnb striatis ; aper- turd oblongd, antice productd, columelld obliqud, subtortuosri.

This pure white ovate form is from the China Seas, being collected The whorls

4. MONOPTYGMA LAUTA, A. Adams.

Mus. Cuming.

Mus. Cuming.

by the writer during the Voyage of H.M.S. Samarang. are grooved, with the interstices striated. Mus. Cuming.

7. MONOPTYGMA SPEciosA, A. Adams. 111. testrl turritil, subw latd, albidd, tenui, semipellucidrl, anfractibus octo, convexius- culis, suturd profundil, cinyillis transversis elevatis, interstitiis concinnb cancellatis, ornatd; aperturd oblongo-ovali, columelld subrectii, superni. plicd obliqud subobsoletd instructd.

Hab. Baclayon ; Philippines. An elegant semipellucid species, resembling an elongated Actaori,

with the whorls encircled with elevated cingilli, aiid the interstices cancellated.

M. testd turritd, albd, epidermide fusco tectil, anfractibus octo, planiusculis, gradatis, suturil canaliculatd? plicis longitudinalibus, angustis, confertis, e t sulcis transversis decussatim ornatd; aperturd oblongd, labio plicd unicil obliqud instructo.

Mus. Cuming.

8. MONOPTYGMA sPiRATA, A. Adams.

Hab. Camaguin ; Philippines. d small turreted species, covered, in the living state, with a light

brown epidermis, and with the surface regularly and beautifully de- cussated with raised lines.

Mus. Cuming.

224

(3. MONOPTVGMA TENELLA, A. Adams. M. testd ovato-turritci’, albd, subpellucidd, anfractibus quatuor, convexiuseubis, trans- versim teriuiter striatri; aperturd ovali, labio subre$exo, plicil obsoletci instructo ; labro dilatato, margine jlexuoso incrassato e f subrej!exo.

Hub. Philippine Islands. Mus. Cuming. A small Rissoa-like shell, with only a faint indication of a plait on

the columellar lip ; the aperture dilated, and the outer lip expanded and slightly thickened anteriorly.

M. testci‘ subulatci, in medio incrussato, a h & subpellucidd, anfrac tibus 9-1 2, planius- culis, transversim tenuiter sulcatii, longitudinaliter substriatd ; aperturi oblongd, labio suqerne plicd obliqud instructo ; labro, in medio, subrecto.

10. MONOPTYGMA STYLINA, A. Adams.

H u b . Catanuan ; Philippines. A remarkable white subulate shell, with the middle whorls, espe-

cially those near the apex, enlarged.

1 1 . MONOPTYGMA SUTURALIS, 9. Adams. AT. testd subulnto- turritti, suburnbilicatd, albii, nitidd, subdiaphand, anfractibus septein planis, suttcrci canalieulntil, transversim sulcatd, au- fractu ziltiino subsohito, fasciis a n p s t is, albo articulatis, or- nato ; aperticrd oblongo-ovali, labio plied evauidd instructo.

Mus. Cuming.

IIa6. Philippine Islands. Mus. Cuming. A small white species, with the last whorl nearly free, and having

the suture deeply channeled.

6. DESCRIPTIONS OF NEW SHELLS, FROM THE CUMINGIAN COL- LECTION ; WITH A NOTE ON THE GENUS NEMATURA.

BY ARTHUR ADAMS, R.N., F.L.S. ETC.

PYRAMIDELLA METULA, A. Adams. P. testd subulatd, turritif, upice obtusiusculo, albidii anfractibus decem planulatis, Iongi- tudinaliter costati, costis coufertis aquantibus, interstitiis lineis trausaersis elevatis ornatd; aperturn” oaali, labio incras- sato, in medio plicii unicii instructo; labro margine subin- crassato.

Hub. Mizamis, Cagayan. Mus. Cuming. A small elongated species, somewhat resesembling a Rissoina, with

the intervals between the ribs finely cancellated, and the whorls very numerous.

P. t e s t i subulatd albd nitidd, anfractibus octo planiusculis bongitudinaliter plicatri’, plicis aqirulibus subcorfertis, interstitiis Iavibus; aperturn” semiovatd, labio subincrassato pliccl unicd munito ; labro subdilatato.

PYRAMIDELLA ACLIS, A. Adams.

Hub. Philippines. Mus. Cuming. This is a slender subulate species, likewise resembling in appear-

ance a Rissoina.