REVISION OF PALEOZOIC STELLEROIDEA. 235 



PAL^OPHIOMYXA GRANDIS (Sttirtz). 



Bundenbachia grandis STURTZ, Palaeontographica, vol. 32, 1886, p. 84, pi. 9, figs. 



2, 2a, 3, 3a. 

 Palseophiomyxa grandis STURTZ, Verh. naturh. Ver. preuss. Rhei.nl., etc., vol. 56, 



1900, pp. 196, 202. 



Formation and locality. Lower Devonic roofing slates of Bun- 

 denbach, Germany. 



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



Family PAL^OPHIURID^E Gregory. 



Palseophiuridx GREGORY, Proc. Zool. Soc. London for 1896, 1897, p. 1034; Treat. 

 Zool., vol. 3, Echinoderma, 1900, p. 274. SCHONDORF, Jahrb. nassauisch. 

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



"Lysophiuras in which the [alternate] ambulacral ossicles consist 

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

 1900.) 



Remarks. 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- 

 terida6 and Palaeophiuridae on the form of the ambulacralia. He 

 says: "The first family has boot-shaped, and the second family 

 bar-shaped 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 to be withdrawn."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: 

 Pal&ophiura Stiirtz. 

 Sturtzura Gregory. 

 Eugasterella, new name. 

 Ptilonaster Hall. 



Genus PAL^EOPHIURA Stlirtz. 



Palxophiura STURTZ, Palseontographica, vol. 36, 1890, p. 233. GREGORY, Proc. 

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



" Palaeophiuridse with the disk surrounded by rod-shaped marginal 

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

 (Gregory.) 



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

 above). Lower Devonic, Bundenbach, Germany. 



