146 S. STILLMAN BERRY. 



accompanying table, that of Naef being slightly modified from 

 his printed synopsis in order better to serve the purposes of the 

 moment. 



STANDARD SYNOPSIS OF THE CLASS CEPHALOPODA. 

 Phylum MOLLUSCA. 

 Class CEPHALOPODA. 



Order I. Tetrabranchiata. 



Suborder i. Nautiloidea. 

 Order II. Dibranchiata. 

 Suborder i. Decapoda. 



Division A. CEgopsida. 

 Division B. Myopsida. 

 Suborder 2. Octopoda. 

 Division A. Pteroti. 

 Division B. Apteri. 



SYNOPSIS OF THE CLASS CEPHALOPODA ACCORDING TO NAEF. 



Phyltim MOLLUSCA. 

 Class CEPHALOPODA. 



Sub-class I. Tetrabranchiata. 



Order i. Nautiloidea. 

 Sub-class II. Dibranchiata. 

 Order I. Decapoda. 



Suborder A. Teuthoidea. 



(a) Teuthoidea myopsida. 



(b) Teuthoidea cegopsida. 

 Suborder B. Sepioidea. 



Order 2. Octopoda. 



Suborder A. Pteroti. 

 Suborder B. Apteri. 



In number of families and genera now living, the CEgopsida 

 easily preponderate, but the tremendous modern development 

 of the genera Polypus, Sepia and LoUgo throws the preponder- 

 ance in species over to the side of the Myopsids (+ Sepioids) 

 and Octopods. For instance, among recent Cephalopoda are 

 to be recognized some 32 families, and in round figures about 

 1 20 genera and 600 species. 1 Of these the (Egopsid Decapods 

 claim 16 families (one half the total), 66 genera (slightly over 

 one half), and around 175 species (nearly one third). The 

 Myopsid (+ Sepioid) Decapods account for but 7 families 

 (nearly one quarter), and 27 genera (nearly one quarter), but 



1 More critical figures compiled from the author's card register will be found 

 in Tables I., II. and III. to follow. 



