Pars 3 
Eoluidiidae. — Ophiocistia. 
9 
Family Eoluidiidae Gregory. 
Eoluidia Stiirtz (syn. Eopliiurites Stiirtz). Eospondylus Gregory. Mio 
spondylus Gregory. 
Family Aganasteridae Stiirtz. 
Aganaster Miller and Gurley (syn. Ophiopege Bohra). 
Family Cliolasteridae Worthen and Miller. 
Cholaster Worthen and Miller. 
Subclass Oplliuroidea Gray. 
Family Onychasteridae Miller. 
Onych aster Meek and Worthen. 
Incertae Sedis. 
Cribellites Tate. 
Order Ophiocistia Sollas. 
Family Eucladiidae Gregory. 
Eucladia Woodward. Euthemon Sollas. 
