Ill 



CLASS IX. MOLLUSCA. 



Remarks. I include the whole grand division, 

 Mollusca, in one class ; though Cuvier subdivides 

 it into the classes, Cephalopodia, head-footed 

 Pteropodia, wing-footed Gasteropodia, trunk- 

 footed Jlcephala, headless Bracniopodia, arm- 

 footed Cirrhopodia, fibre-footed. As this classi- 

 fication is founded upon the anatomical structure 

 of the fleshy interior of the animals, it is manifest 

 that they cannot be classified by their shells ac- 

 cording to this system. As our investigations are 

 mostly confined to the shells, I have adopted the 

 Linnean sections for orders ; and prefixed an or- 

 der for naked molluscous animals, which are not 

 of the radiated division. Could we always ob- 

 tain the molluscous interior, the classification of 

 Cuvier would be preferable, 



ORDER 1. NUDATA. 



Soft animals destitute of shells. 



SEPIA, (cuttle-fish,) body fleshy, receiving the 

 breast in a sheath, with a tubular aperture at its 

 base ; arms 8, beset with numerous warts or suck- 

 ers, and in most cases 2 peduncled tentaculae ; 

 head short ; eyes large ; mouth resembling a par- 

 rot's beak. In sea. This is the animal called 

 the polypusby the. ancients ; but that name Is very 

 differently applied by modern naturalists. 



CLIO, body oblong, nayant, generally sheathed, 

 and furnished with 2 dilated membranaceous 

 arms or wing-like processes ; tentaculae 3, besides 

 2 in the mouth. In sea. 



