INDEX. 



SYSTEMATICALLY ARRANGED. 



SECOND GREAT DIVISION OF THE ANIMAL KINDGOM. 

 ANIMALIA MOLLUSCA. 



General Characters of the Division, 1 . 

 Division of Mollusca into Classes, 4. 



CLASSES. 



I. CEPHALOPODA. 

 II. PTEROPODA. 

 III. GASTEROPODA. 



IV. ACEPHALA. 

 V. BRACHIOPODA. 



VI. ClRRHOPODA. 



ORDERS, GENERA, AND OTHER DIVISIONS. 



CLASS I. CEPHALOPODA. 



Sepia, 7 



Octopus, 7 



Polypus of Aristotle, 9 

 Eledon of Aristotle, 10 

 Argonauta, 10 . 

 Bellerophon, 11 

 Loligo, 11 



Loligopsis, 12 

 Loligo proper, 12 

 Onychotheuthis, 1 1 

 Sepiola, 12 

 Choudrosepia, 12 

 Sepia proper, 12 

 Nautilus, 13 



Spirula, 13 

 Nautilus proper, 14 

 Lituus, 14 

 Belemnites, 15 

 Actinocamax, 15 

 VOL. HI. b 



