MONOGRAPH OF JAPANESE OPHIUBOIDEA. 



383 



AnthopJdura, Aspidophiiwa, Ophiopyrgus^ &c. of the Ophiomastince, 

 Ophiomusiiun of the Ophlolepidlnce and Ophiotrochus of the Ophio- 

 leucldce, apparently resemble one another in some characters ; bnt 

 these resemblances have in my opinion no significance for the 

 phylogeny. 



The interrelationsliips of the Chilophmrida may be shown as 

 follows. 



Ophioleucidae 



■with very rudimentary 



dorsal arm i^lates 



Ophioleucidse 

 with well developed 

 dorsal arm plates 



Ophiomastinse 



Ophiolepidinse 

 with only a 

 few tentacles 



Opliiolepidiuse 



with well developed 

 masticatory apparatus 



Ophiolepidinse pars 



OpliiopsilinsB 



Opliiocomins9 



Ophiodermatinae 



Ophiochitoninae 



Ophiaraclminae 



Ophiacanthidsö 



with only horizontally 

 flexible arms 



