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.' 7 

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

 In the Lower Devonic, Bundenbach, Germany. 



Family EOLUIDIIME Gregory. 



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

 Eophiuridss 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. " Strep tophiuras with the ambulacra! ossicles 

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

 there are 310 buccal shields. (Dorsal arm plates present only in 

 the highest genus.) 



"Remarks. This family includes three Devonian genera, which 

 differ from the previous families 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 living Streptophiurse by the absence of buccal shields and 

 the simplicity of the oral armature." 

 Contains the genera: 

 Eoluidia Stiirtz. 

 Eospondylus Gregory. 

 Miospondylus Gregory. 



Genus EOLUIDIA Sturtz. 



Asterias asperula ROEMER (part), Palaeontographica, vol. 9, 1863, p. 146, pi. 24, 



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

 Eoluidia STURTZ, Palseontographica, 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. 

 EopMurites STURTZ, Verh. naturh. Ver. preuss. Rheinl., etc., vol. 56, 1900, p. 190. 



Diagnosis. "Disk rather large; the interbrachial outlines are 

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

 syngnath 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 

 adambulacral plates are triangular and each of them bears several 

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

 margin of the ventral arm shields. " (Gregory.) 



Genoholotype and only species. E. decheni Sturtz (citations as 

 above). Lower Devonic, Bundenbach, Germany. 



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



