OF 



FAMILIES OF MOLLUSKS. 



[Adopted provisionally by the Smithsonian Institution.] 

 N. B. The Fossil Families are in Italics. 



CLASS A. CEPHALOPODA. 



ORDER L DIBRANCHIATA. 



SUB-ORDER OCTOPODA. 

 (0. littorales.} 



1. Cirrhoteuthidae < Octopodidae, Ad. I, 18. 



2. Octopodidae < Octopodidae, Ad. I 7 18. 



(0. pelagid.) 



3. Philonexidae = Philonexidae, Ad. I, 21. 



4. Argonautidae = Argonautidae, Ad. I, 23. 



SUB-ORDER SEPIOPHORA. 



(Oigopsidae.) 



( Cranchiidae, Ad. I, 26. 



5. Cranchiidae K _ ,. ., , _ orr 



( Loligopsidae, Ad. I, 27. 



6. Chiroteuthidae = Chiroteuthidae, Ad. I, 28. 



7. Onychoteuthidae < Onychoteuthidae, Ad. I, 30. 



8. Ommastrephidae < Onychoteuthidae, Ad. I, 30. 



