MOLLUSCA. 1 63 



reflected hairs, and, from its motion, appears to be destined 

 exclusively for deglutition. The gullet is a simple mem- 

 branaceous tube, terminating in a stomach, which presents on 

 the interior a few longitudinal folds. It is furnished with a 

 small caecum, the extremity of which receives the bile from 

 the liver. The stomach likewise receives the secretion of 

 another gland, which is not connected with the liver, in the 

 form of a small bag, the inner surface of which is covered 

 with numerous papillae. The intestine is lodged in a groove 

 on the surface of the liver, and proceeds directly to the 

 anus. The liver itself is divided into two lobes, and gives 

 rise to numerous biliary ducts, which proceed to the sto- 

 mach. But it likewise gives rise to a duct which proceeds 

 to a small bag plaited on the inside, and afterwards opens 

 on the surface at a small hole near the anus. It yet remains 

 to be determined, whether the fluid carried off by this con- 

 duit be excrementitious matter, separated by the liver, or 

 whether the gland which produces it be distinct from that 

 organ? but so interwoven therewith as to elude the obser- 

 vation of the anatomist. 



It is obvious, from the structure of the digestive organs, 

 that the species subsist on soft food, requiring neither cut- 

 ting nor grinding, and in this respect, differ remarkably 

 from the species of the genus Tritonia, which were formerly 

 arranged along with them. 



The organs of generation differ little from the other her 

 maphrodite gasteropoda. The vesicle furnishes two canals, 

 one of which goes to the testicle, the other to the penis. 

 There is likewise a minute bag connected with the canal of 

 the latter. The spawn is deposited on sea-weeds and stones. 

 It is gelatinous, of a white colour, and in appearance resem- 

 bles the sponge denominated Grantia compressa. 



