CONCHOLOGY. 33 



8. Genus Pollicipes. PI. V. 



Jlnitnal. Body covered by a shell, and supported on a tabular, 

 tendinous, scaly peduncle ; with many tentacular arms. 



Shell. Compressed at the sides, multivalve, contiguous, unequal 

 in number, with numerous small valves situated at the base ; 

 peduncle covered with embricated scales, lower ones rounded and 

 turned upward. Inhabits the European seas. Five species. 

 Pollicipes cornucopia. Pollicipes mitella. 



P. scalpellum. P. peronii. 



P. homii. 



9. Genus Cineras. PI. V. 



Animal. Body pedunculated, and encased in a membranous 

 tunic, which is swollen above, with an opening below the summit, 

 from which protrude many ciliated articulated arms. 



Shell, composed of five testaceous oblong valves, two at the 

 sides of the aperture and three on the back, not covering the 

 whole of the body ; supported by a peduncle of a greenish color, 

 with several longitudinal stripes. Inhabits the British coast, 

 One species. 



Cineras vittata. 



10. Genus Otion. PI. V. 



Ani?nnl. Body pedunculated, enveloped in a membranous 

 tunic, which is ventricose above ; two horn-like tubes, directed 

 backwards, truncated, and open at their points, and situated in the 

 apex of the tunic ; having a lateral opening, with many articulated 

 and ciliated arms. 



Shell. Composed of two testaceous valves, attached near the 

 lateral opening, the centre aperture admitting the animal's tenta- 

 culse, the singular form of which prevents its being blended with the 

 genus cineras without a further examination of its structure. In- 

 habits the North seas. Two species. 



Otion Cuvieri. Otion Blainvitlii, 



