REVISION OF PALEOZOIC STELLEROIDEA. 



223 



Genus BOHEMURA Jaekel. 

 Text fig. 21 . 

 Bohemura Jaekel, Zeits. geol. GeselL, vol. 55, 1903, Protokol, p. ]8 (111), fig. 6. 



This genus, like tlie foregoing, is not defined in the regulation way. 

 Jaekel's fine drawing shows that it is closely related to EopMura, 

 differing mainly in that the rays do not end hluntly, but have slowly 

 tapermg whip-like terminations. These ends are of coui-se ontoge- 

 netically young and reveal the progressive ray development. Here 



FiQ. 20.— Oral skeleton of Eophiura bohemica, after Jaekel. a, ambitlacralia; ad, adambu- 

 lacralia; Ma, madreporite among the scale plates. 



the rays are made up of overlapping and alternating adambulacrals 

 that distally have no ambulacral grooves. Gradually an ambulacral 

 groove is developed and it becomes rapidly wider as one examines 

 the rays more and more proximally, and the adambulacrals turn 

 over and flatten out, finally making the great open ambulacral 

 furrows. The illustration here reproduced, figure 21 on page 224, 

 will show the generic characters as drawn by Jaekel. 



GenoJiolotype and only species. — B. jalini Jaekel. Ordovicic (D4) 

 at Zahorzan, Bohemia. 



Genus PAL^^URA Jaekel. 

 Text fig. 22. 

 PaZajwra Jaekel, Zeits. geol. Gesell., vol. 55, 1903,Protokol,p. 16(109 )-17(110), fig. 5. 



Genoholotype. — Palxura, species not named. No species is again 

 mentioned, nor is it stated that the generic name is new. To give 

 the name standing, the form figured is here named P. neglecta, new 

 genus, new species. It occurs in the Ordovicic (DJ of Bohemia; 

 the exact locality is not given, but may be Osek. 



50601°— Bull. 88—15 15 



