262 BULLETIN 88, UNITED STATES NATIONAL MUSEUM. 



broad, and somewhat lanceolate in shape. Ambulacral ossicles 

 narrow, the lateral wings resting on the whole body of the ossicle." 

 Genoholotype and only species. — P. zitteli (Stiirtz) (citations as above) . 

 In the Lower Devonic, Bundenbfich, Germany. 



Family EOLUIDIID^ Gregory. 



Eoluidiidx Gregory, Proc. Zool. Soc. London for 1896, 1897, p. 1038. 

 Eophiuridx Sturtz, Verh. naturh. Ver. preuss. Rheinl., etc., vol. 56, 1900, 



p. 203. — ScHONDORF, Jahrb. nassauisch. Ver. Naturk., Wiesbaden, vol. 63, 



1910, p. 235. 



Original diagnosis. — " Streptophiuras with the ambulacral ossicles 

 united to form vertebral ossicles. Ventral arm plates present, but 

 there are no buccal shields. (Dorsal arm plates present only in 

 the highest genus.) 



"RemarJcs. — This family includes three Devonian genera, which 

 differ from the previous famihes of this order by the presence of 

 ventral arm plates and by having vertebral ossicles, which articulate 

 ( ? always) by simple rounded pits and processes. The family differs 

 from Uving Strep tophiurge by the absence of buccal shields and 

 the simphcity of the oral armature." 

 Contains the genera: 

 Eoluidia Sturtz. 

 Eospondylus Gregory. 

 Miosjpondylus Gregory. 



Genus EOLUIDIA StUrtz. 



Asterias asperula Roemer (part), PalaeontograpMca, vol. 9, 1863, p. 146, pi. 24, 



figs. 1-5; pi. 26, fig. 6; pi. 27. 

 Eoluidia Sturtz, Palaeontographica, vol. 32, 1886, p. 89, pi. 11, figs. 1, 2; vol. 36, 



1890, p. 211, pi. 26, figs. 10, 11.— Gregory, Proc. Zool. Soc. London for 



1896, 1897, p. 1038.— SoLLAS and Sollas, Philos. Trans. Roy. Soc. London, 



ser. B, vol. 202, 1912, p. 226, fig. 4E. 

 Eophiurites Stijrtz, Verh. naturh. Ver. preuss. Rheinl., etc., vol. 56, 1900, p. 190. 



Diagnosis. — ''Disk rather large; the interbrachial outlines are 

 deeply concave. [Rays very long, slender, and fragile.] Each 

 s}mgnath consists of pairs of mouth frames and jaws; a jaw plate 

 is present. The vertebral ossicles are small and the union of the 

 two lateral elements incomplete; the lateral wings are thin. The 

 ad ambulacral plates are triangular and each of them bears several 

 spines. The pores for the podia occur at the middle of the lateral 

 margui of the ventral arm sliields. " (Gregoiy.) 



Genoliolotype and only species. — E. decTieni Sturtz (citations as 

 above). Lower Devonic, Bundenbach, Germany. 



Cat. No. 35116, U.S.N.M. 



