MOLLUSCA. 803 



Sp. Melania buccinoidea OLIV., JBuccinum prcerosum L., OLIV., Voyage, PI. 

 17, fig. 8, EEEVE Conchyl. Syst. n. Tab. 195, fig. 2, &c. Comp. on the 

 species of this sub-genus FERUSSAC Monogr. des esptces vivantes et fossiles 

 du genre Melanopside, Mem. de la Soc. d'Hist. nat. de Paris, I. 1823, pp. 

 132164, PI. 7, 8. 



Phalanx III. Ceryco'idea (Buccinoidea Cuv.). Cochlea spiral, 

 with aperture emarginate or canaliculate towards the columella, a 

 canal receiving the tube of mantle. 



CeritJiium ADANS., BRUG., LAM. Shell turrite. Aperture 

 oval, oblique, terminated by a short canal truncated or recurved. 

 Animal with two tentacles acuminate, furnished with an oculiferous 

 tubercle towards the base. 



Sp. CeritJiium palustre LAM., Strombus palustris L., RUMPH. Amb. Rariteitk. 

 Tab. 30, fig. Q; BLAINV. Malacol. PL 20, fig. 4; Cerith. telescopium, 

 Trochus telescopium L., EUMPH. Amb. RarUeitTc. Tab. 21, fig. 12, D'ARGENV. 

 Conchyl. Tab. n, fig. 2, BLAINV. Malac. PI. 32 bis, fig. 2, &c. A very 

 numerous genus of which the species live in great part in the sea, partly 

 in brackish water or at the mouths of rivers. The fossil species which are 

 still more numerous (more than 300 according to DESHAYES), are almost 

 all limited to the tertiary formations. Amongst these CeritJiium giganteum 

 deserves to be noticed, a species found in France near Grignon. 



The sub-genus Potamides (Ann. du Mus. xv. pp. 367 370) is usually 

 not accepted by later writers. 



Fastigiella REEVE. 



Sp. Fastig. carinata REEVE, Ann. of Nat. Hist., second series, n. 1848, p. 66. 

 (Habitus of Turritella, characters almost of Cerithium.) 



Pleurotoma LAM. Aperture produced into an elongated straight 

 canal. Shell turrite or fusiform. Columella smooth. Lip cloven 

 or emarginate by a sinus. Two conical tentacles ; eyes at the base 

 of tentacles externally. Operculum horny. 



Sp. Pleurotoma babylonia LAM., Murex babylonius L., RUMPH. Amb. Rari- 

 teitL Tab. 29, fig. L, BLAINV. Malacol. PI. 15, fig. 3, Cuv. R.Ani., 6d.ilL, 

 Moll. PI. 60, fig. 2, &c. A numerous genus, of which also several fossil 

 species are known. 



Fusus BRUG. (in part), LAM. Shell destitute of spines; aper- 

 ture produced into a long straight canal. Columella smooth. 

 Labrum entire. Operculum horny. 



Fusus LAM. Shell fusiform, spire elongate, ventricose in the 

 middle. 



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