INTRODUCTION. 59 



Super-family Palseosolasteracea, Schuchert. 



Family Palseosolasteridse, Schuchert. Genera : Palasosolaster, Stiirtz, Echinasterias, Stiirtz, 

 Echinodiscites, Schuchert (syn. Echinodiscus, Stiirtz), Echinostella, Stiirtz, Medusasfer, 

 Stiirtz. 



Sub-class Auluroidea, SchiJudorf. 



Order Lysophiur^, Gregory. 



Family Protasteridse, Miller. Genera: Teeniaster, Billings (syn. Tasniura, Gregory), 

 EopJiiura, Jaekel, Bohemura, Jaekel, Palseura, Jaekel, Protaster, Forbes, Alepidaster, 

 Meek (syn. Protasterina, Ulrich), Gregoriura, Chapman, Bundenhachia, Stiirtz, Palse- 

 ophiomyxa, Stiirtz. 



Family Pala^ophiuridse, Gregory. Genera : Palseophiura, Stiirtz, Stilrtzura, Gregory, Engas- 

 ierella, Schuchert (syn. Eugaster, Hall), Ptilonaster, Hall. 



Family Encrinasteridse, Schuchert. Genus: Eucrinaster, Haeckel (syn. Aspidosoma, 

 Goldfuss). 



Order Steeptophiur^, Bell. 



Family Ophiurinidse, Gregory. Genera: Ophiurina, Stiirtz, Tremataster, Worthen and 



Miller. 

 Family Lapworthuridse, Gregory. Genera : Squamaster, Kiugueberg, Lapworthura, Gregory, 



Stiirtzaster, Etheridge (syn. PaJmocoma, Salter), Bdtllacoma, Salter, Bhopalocoma, Salter, 



Hallaster, Stiirtz, Sympterura, Bather, Furcaster, Stiirtz, Palastropeden, Stiirtz (syn. 



Palfespondylns, Stiirtz). 

 Family Eoluidiidse, Gregory. Genera: Eoluidia, Stiirtz (syn. Eop)hiurites, Stiirtz), Eospon- 



dylus, Gregory, Miospondylus, Gregory. 

 Family Aganiisteridse, Stiirtz. Genus : Aganaster, Miller and Gurley (syn. Opliiopege, 



Bohm). 

 Family Cholasteridse, Worthen and Miller. Genus : Cholaster, Woi'then and Miller. 



Sub-class Ophiuroidea, Gray. 

 Family Ouychasteridse, Miller. Genus : Onycliaster, Meek and Worthen. 



Incertae Sedis. 



Genus Crihellites, Tate. 



Order Ophiocistia, SoUas. 

 Family Eucladiidse, Gi'egory. Genera : Eucladia, Woodward, Euthemon, Sollas. 



It sliould be noted that Schuchert does not use the term Cryptozonia in the 

 same sense as Sladen. He himself states that " as the inframarginals are 

 seemingly or actually lost independently^ in a number of phyla the term is here 

 used as expressive of this condition, and not necessarily of relationship." 



