CLASSIFICATION. 



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Two genital fissures in each interbrachial space. 

 B. Disk membranous and naked. 



OpMomyxa. 



Ophioblenna. 



Ophioscolex. 



Ophiopsila. 



Ophiothrix. 



Ophiurella. 



Prot aster. 



2nd. Family AsTEROPHYDiiE. 



Characters. 



A. Arms simple. 



B. Arms ramified and divided. 



Asteronyx. 



Asterochema. 



Asteroporpa. 



Trichaster. 

 I Asterophyton. 



( 



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