REVISION OF PALEOZOIC STELLEROIDEA. 191 



Ambulacralia small, adambulacralia larger, both very numerous 

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

 are no inframarginals. 



Oral armature of Cryptozonia construction and very much as hi 

 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 



\ 



R 



FIG. ll.-*-THE PLATES OF THE DISK OF CALLIASTERELLA MIRA. SCHEMATIC. AFTER SCH&NDORF. 1, CEN- 

 TRODORSAL; 2, BASAL RADIALIA; 3, SECOND RADIALIA; 4, THIRD RADIALIA; 5, BASAL INFRAMARGINALS; 6, 

 PAIRED INFRAMARGINALS; a, POSSIBLE POSITION OF ANUS; mdp, PROBABLE POSITION OF MADREPORITE. 



the Upper 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 primitive construction, and although 

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

 the older Phanerozonia. 



COMPSASTERIM;, new family. 



Specialized Cryptozonia with decidedly spicular abactinal skele- 

 ton, recalling that of Asterias. Ambulacra opposite or slightly 



50601 Bull. 8815 - 13 



