44 



BRITISH PALEOZOIC ASTEROZOA. 



StQrtz, 1898. 

 Paheophinra simplex, Stiirtz. 

 Tasniaster cylindricus, Billinfj;s. 

 Tieniasfer sjjinosui!, Billings. 

 Eugash'v logani, Hall. 

 Species not recognised. 

 ? ? Biindenhachia qraiulh, Stiirtz. 



Gregory, 1896. 

 Pdlieophhira simijlex, Stiirtz. 

 T;rnii(ra cylindricns, Billings. 

 Species not recognised. 

 Eurjaster logani, Hall. 

 Ptilonaster princeps. Hall. 

 Not investigated. 



2. Family Prolopliiurse, 1886. 



Ophiurids without mouth, dorsal and radial 

 shields, partly with, partly without, ventral shields. 

 Two halves of vertebrae united more or less as in 

 Recent Ophiurids. 



1. Group of the Protophiur^?;, 1893. 



Ophiurids without ventral shields, halves of 

 vertebrae imperfectly united. Vertebral halves 

 seen from the dorsal side as bar-shaped bodies. 



Op>lHuriiia hjmani, Stiirtz. 



Not investigated. 



2. Order STREPT0PH1UR.E. 

 Defined as bv Bell. 



1. Family Ophiuroidie, 1896. 



Streptoj^hiura; without ventral arm-plates and 

 with separate ainbulacral ossicles. 



Opliiurliia lymani, Stiirtz. 



Tremataster difficilis, Wovthen and Mill. 



? Prof aster decJieni, Dewalque. 



2. Group of the Protophiur^, 1893. 



Separate halves of the vertebrae united with 

 each other. No mouth, ventral or dorsal shields. 



Protaster miltoni, Salter. 

 Ftircaster p)alxozoicus, Stiirtz. 

 OpTiiura zitteli, Stiirtz. 

 Not investigated. 



2. Family Lapworthuridae, 1896. 



Streptophiurte without ventral arm-plates or 

 buccal shields. Ambulacral ossicles fused, but 

 their articulatory surfaces plain. 



Lapivorthura miltoni, Salter. 



Furcaster palxozoicns, Stiii'tz. 



Palastropeden zitteli, Stiirtz. 



Protaster daoidasensis, Davy. 



Aganaster, pars. Miller and Gurley. 



3. Grou}) of the Protophiur.e, 1893. 



As iu imperfectly developed Recent Ophiurse, 

 with ventral shields, but without buccal and 

 dorsal shields. Halves of vertebrae united. 



Opkiura decheni, Stiirtz. 

 Ophiura primigenia, Stiirtz. 

 Ophiura rhenana, Stiirtz. 

 Not investigated. 



3. Family Eoluidite, 1896. 



Streptophiurae, with ambulacral ossicles united 

 to form vertebral ossicles. Ventral arm-plates 

 present, but neither buccal shields nor dorsal 

 arm -plates. 



Eoluidia decheni, Stiirtz. 



Eospondijlus p)')'iniigenia, Stiirtz. 



Miospondylus rhenana, Stiirtz. 



Aganaster gregarius, Worthen and Miller. 



Cholasfer, Worthen and Miller. 



Sub- order Euryal^. 

 As Recent Euryalae, except that they are with 

 out buccal shields and have marginal arm-spines 

 (Stiirtz, 1893). 



4. Family Onychasteridae.Bell, 1892; Gregory, 1896. 

 Streptophiurae, with Avell-developed vertebral 

 ossicles and very flexible unbranched arms. 

 No external arm -plates, the integument only con- 

 taining granules. 



