478 PHILOSOPHY OF ZOOLOGY. 



each side. The superior feelers are situate on the neck. 

 In front of each of these is a small black point or eye. 



The branchiae are situate underneath the dorsal plate, 

 on the right side, and exhibit a complicated plumose ridge, 

 capable of expansion beyond the edge of the plate. The 

 anus is situate immediately behind the branchiae, and be- 

 fore these is the orifice of generation, from which proceeds 

 a groove along the neck to the inferior base of the fore 

 feeler, on the right side, where there is an opening for the 

 penis. 



Within the longitudinal lips there are two smooth, corne- 

 ous plates, the substitutes for jaws ; the tongue is rough, as 

 in many of the other gasteropoda. The gullet is short, and 

 suddenly expands into a large subspiral crop, with mem- 

 branaceous walls. To this, a gizzard with muscular walls 

 succeeds, the interior of which is armed with numerous py- 

 ramidal teeth, with irregular summits, of a cartilaginous 

 nature. The connection between these teeth and the inte- 

 guments is so slender, that they are displaced by the appli- 

 cation of the smallest force. They, however, project so far 

 into the cavity, as to offer resistance to the progress of 

 the food. There is yet another stomach, armed on the one 

 side with deflected, pointed, cartilaginous teeth. At the 

 pyloric extremity are two membranaceous ridges, between 

 which are biliary orifices, and the opening into a long nar- 

 row coecum, with simple walls, which is contained within 

 the liver. The intestine is simple, and after two turns ends 

 in a rectum. 



The salivary glands are very long, and, as usual, empty 

 their contents into the pharynx. The liver is divided into 

 three portions by the folds of the intestine, each of which 

 consists of several lobes. The biliary vessels are very 

 large, and open at the mouth of the coecum into the last 



