ONISCIA.— Pl.vtf I. 



eiicirded throughout with papillary tubercles, with 

 ati obscure ridge interveiiiug, eolumellar lip broadly 

 expanded, gramdcs very irregular, outer lip thickly 

 reflected, furnished with short dentiform ridges ; 

 whitish, sparingly dotted, and, behind the lip, three- 

 spotted with orange-brown, lips light pm-ple-pink, 

 apex red. 



Adams and Beeve, Zool. Voy. Samarang, Moll. pi. 5. 

 fig 3, a and h. 



Hab. Sooloo Archipelago (outside a coral reef near the 

 city of Sooloo, in sandy mud at the depth of from 

 sixteen to twenty fathoms) ; Belcher. 



The surface of this very characteristic species, collected 

 by Captain Sir Edward Belcher during the voyage of the 

 Samarang, is covered with papillary tubercles in rows of 

 about ten, the same number longitudinally as transversely. 

 The eolumellar and outer Ups are delicately enamelled of a 

 livid purplish pink colour. 



Species 4. (Mus. Cuming.) 



Oniscia cancellata. Otiisc. testa oUongo-ovatd, had 

 attemiatd, plus minusve pyriformi, spird eleoatittsctdd, 

 acuta, anfractitms superne rotundatis, longitudinaliter 

 compresse plicatk, costis nnmerom angustis crenulatis 

 tramveisim cancellatis, costis ad juncturas squamatk, 

 labro columdlari fortiter granulato, externo fortiter 

 dentato ; albidd aiitfuscescente-alid,fuscotrifasciatd. 



The cancellated Oniscia. Shell oblong-ovate, atten- 

 uated at the base, more or less pear-shaped, spire 

 rather elevated, sharp, whorls rounded at the upper 

 part, longitudinally eompressly plicated, cancellated 

 transversly with numerous narrow crenulated ribs, 

 ribs squaniate at the crossing, eolumellar lip strongly 

 granulated, outer Up strongly toothed ; whitish or 

 brownish white, encircled with three brown bands. 



SowERBY, Genera of Shells, Onkcia, f. 1 to 3. 



Cassidaria cancellata, Kiener (not of Lamarck). 



liab. China Seas. 



According to the testimony of M. Deshayes, the fossil 

 Camdaria cancellata of Lamarck is a difl'erent species from 

 this, with which it has been usually identified. 



Species 5. (Fig. a and A, Mus. Cuming.) 

 Oniscia tuberculosa. Onisc. testa cylindraceo-oblongd. 



crassd, spird nunc convexd, nunc depresso-pland, apice 

 acnte mueronatd, aufractilius quinquecostatis, costis sub- 

 distantibus, tuberculatis, interstitiis subtiliter liralis 



labro coltimellari exiliter granidato, externo medio 

 coarctato, intus dentictdalo ; intense nigra, irregu- 

 lariter albipunctaid, apertures Jance alba, interdum 

 vivide croced. 

 The tubercled Oniscia. Shell cylindrically oblong, 

 thick, spire sometimes convex, sometimes depressly 

 flattened, pointed at the apex, whorls five-ribbed, 

 ribs rather distant, tuberculated, interstices finely 

 ridged, eolumellar lip faintly gi-anulated, outer lip 

 contracted in the middle, denticulated within ; deep 

 black, dotted irregularly with white, interior of the 

 aperture white, sometimes bright saffron. 

 Sowerby, Genera of Shells, Oniscia, p. 3. Reeve, Conch. 



Syst. vol. ii. p. 211, pi. 253, f. 2 to 4. 

 Sab. Kg. a. Gallapagos Island (in clefts of rocks at low 

 water) ; Cuming. Fig. 2 b. Gulf of California. 

 Of the two specimens here figiu-ed from Mr. Cuming's 

 collection, that represented at Fig. 5 a is but indistinctly 

 granulated, the spire is depressly flattened, and the aper- 

 ture is of bright safii-on colour. In the specimen repre- 

 sented at Fig. 5 b, the spire is eonvexly raised, and there 

 is no indication of colour in the apertm'e. The granules 

 are numerous, but extremely superficial. 



Species 6. (Mus. Dennison.) 

 Oniscia Dennisoni. Onisc. testa trigono-ovatd, spird 

 acuta, anfractibtis superne angulatis, longitndinaliter 

 compresse plicatis, costis numerosis angitstis cancellatis, 

 costis ad juncturas squamatis, labro coltimellari late 

 expan-so, minute granulato, externo liris subirregularibus 

 dentictdalo ; albidd, fusco subobscure tri-qtiadrifasciatd, 

 labro columellari intense sangidneo-rutilo, granulis 

 albidis, labro externo rufescente, liris, albidis. 

 Dennison's Oniscia. Shell triangularly ovate, spire 

 sharp, whorls angled round the upper part, longitudi- 

 nally eompressly plicated, cancellated with numerous 

 narrow ribs, which are squamate at the crossing, 

 eolumellar lip broadly expanded, minutely granulated, 

 outer lip denticulated with somewhat iiregular ridges; 

 whitish, rather obscurely three- or four-banded, eolu- 

 mellar lip very deep blood-red, granules whitish, 

 outer lip light red, with the ridges whitish. 

 Reeve, Pro. Zool. Soe., 1842. p. 21. Conch. Syst. vol. ii. 



p. 211. pi. 253. f. 5 and 15. 

 Hab. — ? 



This species approaches very closely in form and detail 

 of sculpture to the 0. cancellata, but is especially remark- 

 able on account of the intensely red colouring of the 

 columella. 



