EEVISION OF PALEOZOIC STELLEKOIDEA. 



191 



Ambulacralia small, adambulacralia larger, both very numerous 

 ill each column and in their disposition opposite one another. There 

 are no inframarginals. 



Oral armature of Cryj^tozonia construction and very much as in 

 living Asterias glacialis. 



Ocular plates probably not present. 



Genoholotype and only species. — C. mirus (Trautschold) (cita- 

 tions as above). The holotype and three other fragments are from 



Fig. 11.— The pl.vtes of the wsk of Cali.iasterella mira. Schematic. After Scii5ndorf. 1. cen- 

 trodorsal; 2, basal radl\lia; 3, second radulia; 4, THrao radlvlia; 5, basai, inframarginals; G, 

 PAIRED i.nkramarginals; a, possible position of anus; mip, probable position of madreporite. 



the U])i)er Carboniferous (Moscovian), at Mjatschkowa, near Moscow. 

 The holotype is in the University of Petrograd. 



Remarks. — There is no other Paleozoic asterid worked out in such 

 detail as is Calliasterella. Not only is the gross skeleton known, but the 

 detailed construction of all of the essential ossicles and spines as 

 well. Quarto pages of text and two plates are devoted to the skeleton. 



The dorsal skeleton retains j)rimitive construction, and although 

 the ossicles are much modified, their general orientation is that of 

 the older Phanerozonia. 



COMPSASTERID.E, new family. 



Specialized Cryptozonia with decidedly spicular abactinal skele- 

 ton, recalling that of Asterias. Ambidacra opposite or shghtly 



50001°— Bull. 88— IS- 



IS 



