CLASSIFICATION. 



139 



Two genital fissures in each interbrachial space. 

 B. Disk membranous and naked. 



Ophiomyxa. 



Ophioblenna. 



Ophioscolex. 



Ophiopsila. 



Ophiothrix. 



Ophiurella. 



Prot aster. 



2nd. Family Asterophydi^. 

 Characters. 



A. Arms simple. 



B. Arms ramified and divided. 



{Asteronyx. 

 Asterochema. 

 Asteroporpa. 



f Trichaster, 

 "j^ Asterophyton. 



19 



