254 Lamarck's Genera of Shells. 



whorls always round. Aperture entire, round, not disturbed 

 by the penultimate whorl ; lips disunited at the upper part, 

 columella arched, flattened, not truncated at the base. An 

 operculum. 



The axis of the shell is generally more inclined than that of 

 the trochus. 



Type. Turbo marmoratus* . (Idem. Linn.^ 



Shell subovate, very ventricose, imperforate, smooth, marbled, 

 or subfasicated with green, white and brown ; last whorl trans- 

 versely nodular, in three directions ; upper nodules largest ; 

 base of the lip expanded, caudate ; mouth silvery. Indian 

 Ocean. PI. VIII. Fig. 168. 34 Species. 

 6. Planaxist. 



Shell oval-conical, solid. Aperture oval, sublongitudinal- 

 Columella flattened, truncated at the base, separated from 

 the right lip by a narrow sinus. Interior face of the right lip 

 furrowed or striped, with a callus running under its summit. !' 



The planaxis is distinguished from phasianella by the trun- 

 cation of the columella ; it is transversely furrowed externally, 

 and generally of small size. 



Type. Planaxis sulcata^. 



Shell ovate-conical, imperforate, transversely sulcated, white, 

 spotted with black; spots subquadrate ; margin of the lip 

 crenate ; internally striated. Antilles. PI. VIII. Fig. 169. 

 2 Species. 



7. Phasianella§. 



Shell oval or conical, solid ; the last whorl much larger 

 {han any of the others. Aperture entire, oval, longitudinal, 

 inchned obliquely towards the base of the columella, round at 

 the lower part, and contracted at the upper; lips disunited at 

 the upper part ; right margin acute, not reflected. Columella 

 smooth, compressed, attenuated at the base. Operculum cal- 

 careous or horny. 



Generally smooth, brilliant shells, without any epidermis, 

 and ornamented with various lively colours. 



* Marbled. + Flattened axis '! i Furrowed. 



} Dim. from Pluisianus, a pheasant. 



