I\T KM) DICTION. 45 



Stlrtz, 1898. Gkegory, 189G. 



Onijchasier JiexiUs, Meek and Wortlien. Oni/rJui.^ttr Jle.r!Iis, Meek and Worllien. 



5. Family Eucladiiclae, 1896. 



Streptopluurae, with contorted branching arms, 

 rive pairs of large plates round the centre of the 

 si^e exposed in the fossil have been regarded 

 either as jaws or radial shields. Madreporite on 

 the same side as the plates. Arms have no external 

 arm-jilates, but a granular integument. 



Eucladia johnsoni, H. Woodward. Eiccladia Johnson i, H. Woodward. 



Helianthaxfpr rhenaniis, Eoemer emend. Not investigated. 



Stiirtz. 



Classificafio)). of the Ophiaroidcd tircurtJiir/ to Stiirt::, 1891>. 



Sub-order Ophiuke.*:. 



1. Family Ophio-Encrinasterise (characters as in 1893), including Protin^ter scdijwiclil, Forbes, 



P. forbesi. Hall, P. biforis, Gregory, Sturtztira brisingoides, GrregoiT, S. Jeptosoma, Salter 

 sp., Palti'ophiura simplex, Stiirtz, Tft'jn'as/er cyliiidrirus, Billings, T. sjnnosiis, Billings, Eiigof'fcr 

 logani, Hall, ? Ptilonaster princeps. Hall. 



2. Family Protophiurese (characters as in 1893, excejit that Stiirtz remarks that when the opposing 



halves of the vertebrae are fused they are more or less of a streptophiuran type). 



1. Sub-family Ophiurinidse, including Opliiiirina lijmunni, Stiirtz. 



2. Sub-family Palseospondylidse, including Ptr/<'eo.?/yoH(/^/;/s (^Optdura) zlfttli, Stiirtz. 



3. Sub-family Palseophiomyxidse, including Paln'opliiomyxa {Binidtnhacli'ia) fjrandis, 



Stiirtz. 



4. Sub-family Ouychasteridse, including Onycliaster flexilis. Meek and Worthen. 



5. Sub-family Lapworthuridse, including Lapworthiira (Protaster) miltonl, Salter sp. 



6. Sub-family Furcasteridse, including Furcaster pahvozoicus, Stiirtz. 



7. Siib-family Eophiuridae, including EopJihn-ites (OpJiiiira) declieni, Stiirtz, Eospondyhis 



(Opliiura) primhjenins, Stiirtz sp., Miospondyliis {O^ihlura) rhenaniis, Stiirtz sp. 



8. Sub-family Aganasteridae, including Afjanaster (Protasfer, Opiliiopege) rjregariiis, 



Worthen and Meek sp., ? ChoJasfer, Worthen and Miller. 

 Primitive streptospondylous forms of doubtful affinity (Protophiurese or Palae-Euryalidae), including 

 Helianthaster rhenaniis, F. Roemer, Eucladia johnsoni, Woodward. 



(b) The Classip'catioii of the AsteroiiJea. — Stiirtz, following Broun, divided tlie 

 forms whicli he regarded as Asteroidea into the two snl)-orders, Encrinasteria? 

 and Eaasteroidea. These sub-orders were again subdivided into Phanerozonia 

 and Cryptozonia. Four main groups were thus obtained : 



1. Encrinasteri^-Phaneeozonia, including Aspidosoma tischbeinianum, Roemer em. Stiirtz, A. 

 arnoldi, J. Miiller, A. arnoldi, Goldfuss, A. petaloides, Simonow, A. sp., Stiirtz, Stenaster (Pala'aster) 

 rutliveni, Forbes, S. hirudo, Forbes, 8. piilcJiellus, Billings, S. coronella, Salter, Vrasterella (Stenaster) 

 salteri, Billings, Urasterelta (Uraster) ohtiisa, Forbes, Hiidsonaster (Palasterina) rugosum, Billings, 

 Pala'aster (nvdiiy species). Hall, Billings, Salter, Archasterias rhenana, J. Miiller, Pahvostella solidii. 



