Lamarck's Genera of Shells. 257 



straight canal, more or less elongated. A fissure or sinus in 

 the upper part of the right lip. Operculum oblong, horny. 

 Type. Pleurotoma Bahylonica* . (Murex Babylonius. Linn.) 

 Shell fusiform, turrited, transversely carinated, and banded, 

 white ; bands spotted with black, spots quadrangular ; whorls 

 convex ; base rather long. 



Indian Ocean. PI. VIII. Fig. 174. 25 recent species, and 30 

 fossil. 



3. Turbinellaf. 

 Shell turbinate, or subfusiform, channelled at the base ; from 

 three to five compressed, transverse folds on the columella. 



Distinguished from volula, by the canal at the base of the 

 aperture ; from murex by having no varices, and from fascio- 

 laria by the direction of the folds on the columella. 



Type. Turbinella cornigeraX. (Voluta turbinellus. Linre.) 

 Shell ovate-turbinated, subtriangular, transversely sulcated, 

 with white turbercles on every side ; interstices of the tubercles 

 black ; upper part of the last whorl surmounted by thick elon- 

 gated tubercles, trifurcate posteriorly, and near the base, muri- 

 cated with other simple tubercles ; spire very short, acuminated ; 

 columella quadriplicate. 



Indian Ocean. PI. VIII. Fig. 175. 23 Species. 



4. Cancellaria §. 

 Shell oval or turrited. Aperture sub-canaliculate at the base ; 

 canal very short or scarcely perceptible. Columella plaited ; 

 folds numerous or few, generally transverse ; right lip sulcated 

 internally. 



Type. Cancellaria reticulata \\. (Voluta reticulata, Linn.) 

 Shell ovate, ventricose, perforate, thick, transversely rugose, 

 reticulated with oblique longitudinal strise, slightly marked with 

 yellowish white, and red zones; whorls convex; sutures com- 

 pressed ; upper part of the columella smooth, lower portion 

 triplicate. 



South Atlantic Ocean. PI. VIII. Fig. 176. 12 recent species, 

 and 7 fossil. 



" Bahylonmn. Lamarck's 17th species. His type is P. impcrialis. 



t Dim. of Turbo. 



i Homed. Lamarck's 7th species ; his type is T. scolymus. 



? i'rom canceUi, latices '! II Reticulated. 



S 2 



