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. 
Class. 
MOLLUSCA.. 
I. Cephalopoda 
II. Pteropoda 
III. Gasteropoda 
IY. Acephala 
V. Brachiopoda 
YI. ClRRHOPODA 
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. 
II. Nautilus 
Subgenus. Example of Species. 
•• Octopus Zam PoO Sepia octopodia; L . 
lypiiSj Aristotle • « J 
Eledone, Arist Octopus moschatus, Lam. 
2. Argonauta, Lin... / Nautilus & Porapilus of the 
(. ancients 
3. Bellerophon (Fossil) .B. vasulites, Montf. 
4. Loligo, Lam Sepia loligo, Lin. Calamary 
5. Onykia, Lesueur . . . . On. caribcea, Lesueur 
G. Sepiola, Cuv Sepia sepiola, Lin. 
7. Chondrosepia,£ e a-| choni loligiformiS) Leukard 
j8. Sepia, prop. Lam. { Se P“ " fflci " alis * Lin ‘ Commm 
1. Spirula, Lam N. spirula, L. Rams-horn 
2. Nautilus, prop. Cuv. -f N. pompiiius, L. Great cham- 
r r I. berea nautilus 
