zv(;oriiiURAE 495 



Order II. Zygophiurae. 



This group iucludes all tlie common and better-known British 



Fic. 217.— Aboral view of Ophiixjhipha {Ophiura) bullata. x i. (From Wyville Thomson.) 



forms. They are divided into five families, all of which are 

 represented in lUitish waters. 



Fam. 1, Ophiolepididae.^ — Arm inserted in a definite cleft 



1 Ilamann, Bronns Tlikr-lleich, Bd. ii. Abt. 3, Ophiuroidea, 1900, p. 910 f., 

 discriiuiiiates a family Opliioderniatidae, but gives no character by which it can 



be distinguished from Ophiolepididae. 



