PLEUROTOMA. 



Plate XXIX. 



(All magnified to twice their natural size.) 



Species 256. (Mus. Cuming.) 



Pleurotoma pseudo-carixata. Pleur. testa ovatd, sub- 

 pgramidali, aufractilms saperne concavis, subindistincte 

 carinatis, infra cotifertim. plicato-costatis, transversim 

 crebrisulcaUs ; basi trnncatd ; fiavescente. 



The false-keeled Pleurotoma. Shell ovate, some- 

 what pyramidal, whorls concave round the upper part, 

 somewhat indistinctly keeled, closely plicately ribbed 

 beneath, transversely closely grooved ; base truncated; 

 yellowish. 



Eeeve, Pro. Zool. Soc, 1845. 



Eab. ? 



The plicated ribs are rather oblique. 



Species 257. (Mus. nost.) 



Pleurotoma languida. Pleur. testa gracili-fusiformi, 

 longitudinaliter noduloso-costata, transversim elevato- 

 slriata, costis striisque subdistantibus ; sinu amplo; alba, 

 rufescente-fusco tinctd. 



The feeble Pleurotoma. Shell slenderly fusiform, 

 longitudinally nodulously ribbed, transversely ele- 

 vately striated, ribs and stria? rather distant ; sinus 

 large ; white, stained with reddish-brown. 



Peeve, Pro. Zool. Soc, 1S15. 



An elegantly formed slender shell. 



Species 258. (Mus. Metcalfe.) 



Pleurotoma puncticixcta. Pleur. testa ovatd, spird 



brmusrulii, /uuiji/udiua/iter sububscure p/iratd, iulur- 



stitiis iuiuu/issi,ui strialis ; siuu subamphj ; albidd, cin- 



guld loiicd punctata' xpiroliter urnatd. 

 The dot-encircled Pleurotoma. Shell ovate, spire 



rather short, longitudinally rather obscurely plicated, 



interstices very minutely striated ; sinus rather large ; 



whitish, spirally ornamented with a single belt of 



dots. 

 Reeve, Pro. Zool. Soc, 1845. 

 Hab. ? 



Encircled by a belt formed of a single dot in each lon- 

 gitudinal interstice. 



Species 259. (Mus. Gray.) 



Pleurotoma Nassoides. Pleur. testa ovato-turrita, 

 tenui, quasi pellucidd, anfractibm subrotundatis, confer- 

 tim obtuse costatis ; labro incrassato, intus denticulato, 

 sum subamplo ; corneo-alh'uld, anfractibus supra et 

 infra rufo-fuscofasciatis. 



The Nassa-like Pleurotoma. Shell ovately turreted, 

 thin, as though pellucid, whorls somewhat rounded, 

 closely obtusely ribbed ; lip thickened, denticulated 

 within, sinus rather large ; horny white, whorls banded 

 with reddish-brown above and below. 



Gray, MSS. (private cabinet.) 



Eab. - ? 



A semi-transparent horny looking shell, banded next the 

 sutures with reddish brown. 



Species 260. (Mus. nost.) 



Pleurotoma pyramidula. Pleur. testa subpyramidali- 

 elongatd, liris minutis lonyitudinalibus et transversis 

 ereberriml clathratd, suturis unicarinatis ; apertura 

 parvd, xniu amplo ; basi truncatd; albidd, 



The minaret Pleurotoma. Shell somewhat pyramidally 

 elongated, very closely latticed with minute longitu- 

 dinal and transverse ridges, sutures one-keeled ; aper- 

 ture small, sinus large ; base truncated ; whitish. 



Peeve, Pro. Zool. Soc, 1815. 



Eab. ? 



Solid, and tapering with peculiar symmetry to the apes 



Species 261. (Mus. nost.) 



I'l i I EtOTOMA SB0GIXOSA. I'leitr. testa acuiniuatii-turrild, 

 anfractibus longitudinaliter subobsolete plicato-a 

 interstitiis minutissinie impresso-striatis ,• albidd, suturis 

 livido-viridescentibus, anfractiis ultimi parte inferiori 

 Iwido-viridescente, punctis nigricantibus marginatd. 

 apice rufescente-fusco. 



December 1S-15. 



