On the Animals and Teeth of some Gasteropodous Mollusca. 99 



and with a slender filiforai appendage near the tip. Operculum 

 none. 



Fam. Tritoniad^. 



The animals of this family are intermediate in character between 

 the ProboscidifercR and the Rostriferce. The proboscis is larger and 

 thicker than in the other families of the Prohoseidiferce, is not so 

 much retracted, and is contained in a more free sheath, and the end 

 of the retracted tnink is often jjartly exposed beyond the margin of 

 the sheath, ginng the animal somewhat the external appearance of 

 the Rosti-ifei'tx, and explaining why some of the French figures of 

 the animals of Tfito7i, Ranella, &c. are represented as if they be- 

 longed to that di^'ision of the Gasteropods. 



Ranella celata. 



Tentacles lateral, separated by a short, rather broad, truncated 

 tubular veil; eyes on the outer side rather above the base; proboscis 

 short, very large and thick, retracted to the edge of the veil, leaAang 

 the two rounded pale processes of its apex exposed, forming with the 

 veil a rostrum-like projection, very unlike the elongate, slender, 

 cylindrical retracted proboscis of Mvrex, Purpura, &c. ; lingual 

 membrane narrow, elongate ; teeth in seven series, 3 • 1 • 3, close 

 together, rather crowded, the central rather narrow, with a central 

 prominent denticle, ha^'ing a smaller one on each side of the base ; 

 the lateral teeth subulate, curved. 



SCTJTIBRANCHIATA RhIPIDOGLOSSA. 



Fam. TuRBiNiD^. 

 Imperator, n. s. 1 Panama. 



Eye-pedicel thick ; tentacles elongate, slender ; frontal lappets trun- 

 cated, broad at the base, about \ the width of the forehead ; foot 

 folded longitudinally Ijehind and transversely in front ; lateral fringe 

 of the right side most distinct; muzzle produced, annulated ; lingual 

 membrane elongate, rather narrow, linear, dark brown ; central teeth 

 5" 1 "o, the middle one broad, the side ones narrower, square, all with 

 a recurved tip ; the lateral teeth numerous, hairlike, the inner one 

 wider. 



Callopoma saxosum. Panama. 



Foot folded across in the middle ; back with a hoodlike process 

 covering the front part of the operculum, and depositing the external 

 callosity of it ; eyes on short thick pedicels ; tentacles linear, at the 

 upper edge of the eye-pedicel ; frontal lappet truncated, narrow at 

 the base, at the inner side of the base of the tentacles ; lateral fringe 

 on each side, with three beards on the middle of the edge ; lingual 

 membrane broad, elongate ; central series 5 • 1 • 5 ; the central broad, 

 with a recurved tip, the lateral one more narrow, equal ; the lateral 

 teeth numerous, hairhke. 



7* 



