OF 



FAMILIES OF MOLLUSKS. 



[Adopted provisionally by the Smithsonian Institution.] 

 U". B,— The Fossil Families are in Italics, 



Class A.— CEPHALOPODA. 



Order L— DIBRANCHIATA. 



Sub-Order Octopoda. 

 {0. littorales.) 



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



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



[0. pelagici.) 



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



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



Sub-Order Sepiophora. 

 [Oigopsidae.) 



( Cranchiidae, Ad. I, 26. 



5. Cranchiidae \ t- ^. -i * i t orr 



( Loligopsidae, Ad. I, 27. 



G. Chiroteuthidae = Chiroteuthidae, Ad. I, 28. 



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



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



so 



