PLEUEOTOMA.— Plate XXXVII. 



Species 34-1. (Mus. Cuming.) 

 (Magnified to three times its length.) 



Pleurotoma cornea. Pleur. testa, ovatd, spird acumi- 

 nata, corned, suhpellucidd, concentrice tenuicostatd ; 

 fuscescente, zona angusta pallida cingulatd. 



The horny Pleurotoma. Shell ovate, spire acuminated, 

 horny, semi-transparent, concentrically finely ribbed ; 

 light brown, encircled by a narrow pale zone. 



Eeeve, Pro. Zool. Soc, 1846. 



Bab. ? 



Ribs of a very delicate character, flowing concentrically. 



Species 342. (Mus. Metcalfe.) 

 (Magnified to three times its length.) 



Pleurotoma foveolata. Flew, testa ovatd, liris forti- 



bus elevatis nndique reticulatis, liris ad decussationem 



granosis ; alba. 

 The pitted Pleurotoma. Shell ovate, reticulated 



throughout with strong elevated ridges, granose at 



the point of crossing ; white. 

 Reeve, Pro. Zool. Soc., 1846. 

 Hob. ? 



The interstices between the reticulations are peculiarly 

 deeply pitted. 



Species 343. (Mus. Taylor.) 

 (Magnified to two and a half times its length.) 



Pleurotoma Greenlandica. Pleur. testa tenui, ovatd, 

 transversim creberrime elevato-striatd, striis subirregu- 

 laribus, spirm suturd subprofundd ; sordide albd aid 

 fuscesceide. 



The Greenland Pleurotoma. Shell thin, ovate, trans- 

 versely very closely elevately striated, striae somewhat 

 irregular, suture of the spire rather deep ; dirty white 

 or brownish. 



Defrancia suturalis, Moller. 



Hah. Greenland. 



Another of the little group which has been distinguished 

 by a new generic title in compliment to M. Defiance. 



Species 344. (Mus. Cuming.) 

 (Magnified to twice its length.) 



Pleurotoma pagoda. Pleur. testa pyramidali-acumii 

 anfractibus longitudinaliter crassicosiatis, transve 

 subtilissime liratis, aperfurd brevi ; olivaceo-fuscd. 



The pagoda Pleurotoma. Shell pyramidally aciunmi 

 whorls longitudinally stoutly ribbed, transversely 

 finely ridged, aperture short ; olive brown. 



Eeeve, Pro. Zool, Soc., 1846. 



Hob. ? 



This little species has a peculiar pagoda-like form, J 



the strong; ribs eontmuins; one under the other. 



Species 345. (Mus. Taylor.) 

 (Magnified to three times its length.) 

 Pleurotoma rugulatus. Pleur. testa ovatd, anfrac 

 supeme angulatis, concentrice tenuicostatis, inters, 

 subtilissime elevato-si riatis ; sordide albd. 

 The wrinkled Pleurotoma. Shell ovate, whorls 

 gidated round the upper part, concentrically fi 

 ribbed, interstices veiy finely elevately striated ; 

 white. 

 Defrancia rugulatus, Moller. 

 Hab. Greenland. 



Another interesting species of the Defrancia group. 



Species 346. (Mus. Cuming.) 



(Magnified to twice its length.) 



Pleurotoma semigranosa. Pleur. testa acuminato- 

 ritd, anfractibus superue concavis, medio nodoso-cost 

 infra granosis, aperturd parvd ; albidd, fascia auri 

 inferne cingulatd. 



The half-graixed Pleurotoma. Shell acumin; 

 turret ed, whorls concave round the upper part, 

 dosely ribbed in the middle, granulated bene 

 aperture small ; whitish, encircled round the lc 

 part with an orange band. 



Eeeve, Pro. Zool. Soc, 1846. 



Hab. ? 



The variety of sculpture above described is very cha 

 teiistic. 



