INVERTEBRATA. 



DIVISION II.— MOLLUSCA. 



The animals of this second grand division of the animal kingdom 

 are either naked or testaceous. 



They are divided into six classes. 



Division. 



MOLLUSCA.. 



Class. 



I. Cephalopoda 

 . Pteropoda 

 Gasteropoda 

 IV. Acephala 

 V. Brachiopoda 

 VI. Cirrhopoda 



)in. 



CLASS I.— CEPHALOPODA. 



This class, named from the long prehensile arms which surround 

 the head, includes but one order, designated by the same name, 

 divided into six genera. 



Genus. 



I. Sepia. 



IL Nautilus . . . 



Subgenus. Example of Species. 



Octopus, Lam. Po-l g j^ octopodia, L. 



lyTpus, Aristotle .. ) 

 Eledone, Arist Octopus moschaUis, Lam. 



Argoiiauta,Zi«... 1^^"'""^^' Pompilus of the 



° (. ancients 



Bellerophon (Fossil) .B. vasulites, Montf. 



Loligo, Lam Sepia loligo, Lin. Calamary 



Onykia, Lesueur , . . . On. caribcea, Lesueur 



Sepiola, Cuv Sepia sepiola, Lin. 



Cliondrosepia,ieK-| cjj^^_ loligiformis, Leukard 



„ ■ T r Sepia officinalis, Lin. Commou 



Sepia, prop. Za»«. | ^^^^^^^ 



Spirula, Lam.. .... t"^, spiiula, L. Rams-horn 



XT ,., ^ f N. ponipilius, L. Great cham- 



Nautilus.piop. Cuv. ■{ / / .., 

 "^ '■ ( bered naxUUus 



