PLEUROTOMA 



Plate XXXI. 



(All magnified to twice their natural length.) 



Species 276. (Mus. Cuming.) 

 Pleurotoma scrota. Pleur. testa oblongo-ovatd, tenui- 

 culd, subventricosd, spirts suturis profundi*, striis im- 

 pressis longitudinalibus et transveris undique decussatd; 

 aperturd subelongaid, ampld; albicante. 

 The sickly Pleurotoma. Shell oblong-ovate, rather 

 thin, a little ventricose, sutures of the spire deep, de- 

 cussated throughout with longitudinal and transverse 

 strife ; aperture rather elongated, large ; whitish. 

 Reeve, Pro. Zool. Soc, 1845. 



Bab. Singapore (found among fine sand at the depth 

 of seven fathoms) ; Cuming. 



Intermediate in form betweenMr.Hind's genus DapAneUa 

 and Pleurotoma true. 



Species 277. Mus. Taylor.) 



Pleurotoma scalaris. Pleur. testa ovatd, tenui, spird 

 breviusculd, concentrice sii/iplicatd, columella lem'ter 

 plano-excavatd, labro tenui, simplici; sordide albd. 



The ladder-step Pleurotoma. Shell ovate, thin, spire 

 rather short, concentrically subplicated, columella 

 slightly flatly excavated, Up thin, simple ; dirty white. 

 Defrancia scalaris, Vahl. 



Ha b. Greenland. 



A small concentrically plicated shell, with a dark tinged 



flattened columella. 



Defrancia reticulata, Vahl. 

 Hab. Greenland. 



Differing from the preceding species by its rather more 

 attenuated form, and reticulated style of sculpture. 



Pig. 279. 



Pleurotoma nitida, Sowerby. Pro. Zool. Soc., 1833. 

 As this shell proves to be a rather worn specimen of the. 

 Pleurotoma variculosa of the same author, I take the op- 

 portunity of describing a species very like it in form, but 

 merely very closely concentrically ribbed, with simple 

 sutures. 



Species 279. 



Pleurotoma concentricostata. Pleur. testa gracili- 

 fusiformi, spird acuminata, anfractibus creberrime twi- 

 ce,,/ rice costatis, suturis simplicibus ; iucarnato-fusces- 

 cente. 



The concentric-ribbed Pleurotoma. Shell slenderly 

 fusiform, spire acuminated, whorls very closely con- 

 centrically ribbed, sutures simple ; flesh-tinged brown. 



Reeve, Pro. Zool. Soc, 1845. 



Hab. ? 



Fig. 280. — Pleurotoma hyalina (ante pi. xxx. fig. 269), a 

 smaller but adult specimen. 

 For species 280 see pi. xxxix. 



Species 278. Mus. Taylor. 

 Pleurotoma leucostoma. Pleur. testa ovatd, tenui, 

 ventricosd, spird breviusculd, suluris subimpressU ; an- 

 frarti/jHs superne depressis, longitudinaliter creberrime 

 plicatis, transversa,!, striis reticulatis ; columella subex- 

 cavatd, labro tenui simplici; sordide alba, columella 

 el aperture fauce eburneis. 

 The white-mouth Pleurotoma. Shell ovate, thin, 

 ventricose, spire rather short, sutures somewhat im- 

 pressed ; whorls depressed round the upper part, lon- 

 gitudinally very closely plicated, transversely reticu- 

 lated with striae; columella slightly excavated, lip 

 thin, simple ; dirty white, columella and interior of 

 the aperture ivory white. 



Species 2S0. (Mus. Cuming.) 



Pleurotoma lirata. Pleur. testa subfusiformi, basi con- 

 tractu, transrersim undique lirata, columella excavatd, 

 callosilate superne munitd, labro sulefuso, leviier in- 

 crassato, sinu lato amplo, canali paululum elongato . 

 albidd, labri margine inlus rufescente. 



The eidged Pleurotoma. Shell somewhat fusiform, 

 contracted at the base, transversely ridged through- 

 out, columella excavated, furnished with a eallositj a1 

 the upper part, lip somewhat effused, slightly thick- 

 ened, sinus broad, large ; canal a little elongated ; 

 whitish, edge of the lip stained with red. 



Reeve, Pro. Zool. Soc, 1845. 



December 1845. 



