REVISION OF PALEOZOIC STELLEROIDEA. 235 



PAL^OPHIOMYXA GRANDIS (StUrtz). 



Bundenbachia grandin Sturtz, Palaeontographica, vol. 32, 1886, p. 84, pi. 9, figs. 



2, 2a, 3, 3a. 

 Palxopkiomyxa grandis Sturtz, Verh. naturh. Ver. preusa. Rheinl., etc., vol. 56, 



1900, pp. 196, 202. 



Formation and locality. — Lower Devonic rooriiig slates of Bun- 

 denbacli, Germany. 



Cat. No. 59388, U.S.N.M. 



Family PALiEOPHIURID^E Gregory. 



Palseophiuridx Gregory, Proc. Zool. Sec. London for 1896, 1897, p. 1034; Treat. 



Zool., vol. 3, Ecliinoderma, 1900, p. 274. — Schondorf, Jahrb. nassauisch. 



Ver. Naturk., Wiesbaden, vol. 63, 1910, p. 237. 



" Lysophiiirae in which the [alternate] ambiilaeral ossicles consist 



of a bar-shaped or subqiiadrate 'body' without wings." (Gregory, 



1900.) 



Remarlcs. — This family differs from the Protasteridse in ''having 

 the ambulacral ossicles longer than wide, and never divided trans- 

 versely by muscular depressions. The ambulacral ossicles are either 

 bar-shaped or thickened to a subquadrate form. They are never 

 boot-shaped." (Gregory, 1897.) 



Schondorf states that Gregory established the families Protas- 

 terida? and PalreophiuridsB on the form of the ambulacralia. He 

 says: "Tlie fii-st family has boot-shaped, and the second family 

 bar-shuped or subquadrate ambulacrals. The form of the latter is 

 nothing more than a poor development of the boot-shaped type of 

 ambulacrals. Accordingly the second family has no value and is 

 to be withdrawn." In addition the forms of Sturtzura have boot- 

 shaped ambulacrals, and these "are so little alternate in arrangement 

 that their alternation appears to me more than questionable." 

 (Schondorf, 1910.) 

 Contains the following genera: 

 Palseo'phiura Sturtz. 

 Sturtzura Gregory. 

 Eugasterella, new name. 

 Ptilonaster Hall. 



Genus PAL^^SOPHIURA Sturtz. 



Palseophiura Sturtz, Palaeontographlca, vol. 36, 1890, p. 233. — Gregory, Proc. 

 Zool. Soc. London for 1896, 1897, p. 1034. 



" Palaeophiuridae with the disk surrounded by rod-shaped marguial 

 ossicles. The ambulacral ossicles are rods lymg parallel to the arm. " 

 (Gregory.) 



Genoholotype and only species. — P. simplex Sturtz (citations as 

 above). Lower Devonic, Bundonbach, Germany. 



