1042 DR. J. W. GREGORY ON THE CLASaiPICATIOS [DeC. 15, 



Synoj>sis of Classification. 



Class STELLEEOIDA. 



Subclass OPIIIUE,OIDEA. 



Oi-der I. Lysophiurae. — Aml)ulacral ossicles alternate, free. No 

 ventral arm-plates. 



Pam. 1. PeotasteeidjB. Boot-shaped ambulacral ossicles. 

 Genera. — Protaster, Porbes. 



Bxindenhaclna, Stiirtz. 



Pam. 2. PAiiiEOPiiniRiDJE. Long bar-shaped ambulacral 

 ossicles. 

 Genera. — Sturtzura, Greg. 



Palaiopldura, Stiirtz. 

 Tceniara, Greg. 

 Eufjasier, Hall. 

 Ptilonaster, Hall. 



Order II. StreptopMurae. Vertebral ossicles present, with more or 

 less Streptospondyline articulations 



Fam. 1. OniiUKiNiDvE. Ambulacral ossicles slightly 

 united and no ventral arm-- 

 plates. 

 Genera. — Ophiurina, Stiirtz. 



frematastei; Worth. & Mill. 



Pam. 2. LAr\voRTiiURiDJ3. Ambulacral ossicles fused. 

 No ventral arin-plat«s. 

 Madreporite dorsal. 

 Genera. — Lapivorthura, Greg. 

 Fnrcaster, Stiirtz. 

 Palastropeeien, Stiirtz. 



Pam. 3. EoLuiDiDiE. Vertebral ossicles. Ventral arm- 

 plates, but no buccal shields. 

 Genera. — Eohddia, Stiirtz. 



Eosimuhjlas, Greg. 

 Miospondylus, Grog. 

 Afjanaster, Mill. & Gurl. 

 Cholaster, Worth. & Mill. 



Pam. 4. OntohastbeidjE. Contorted unbranched arms. 

 Integument granular. 

 Genus. — Onyelmster, Meek & Worth. 



Pam. 5. EucladiidjE. Contorted branciied arms. In- 

 tegument granular. 

 Genus. — Eacladia, II. Woodw. 



