FIVE NEW SPECIES OF RECENT UNSTALKED CRINOIDS. 



By Austin Hobakt Clark, 



ColIaborut(jr, Dirision of Marine Jiircrfchratcn, U. 8. National Museum. 



From time to time crinoids have been received at the U. S. National 

 Museum Avhich were evident!}^ neAV species, but which have been left 

 undescribed because of the absence of rehited species with which to 

 make comparisons. One by one these missing species have come to 

 hand and the relationships of previously obscure forms have been 

 cleared up. In the present paper five sj^ecies are described, the affini- 

 ties of which have been brought out through the study of material 

 recently received. 



Family COMASTEEIDyE. 



Genus COMANTHUS A. H. Clark. 



Subgenus COMANTHUS A. H. Clark. 



Group BENNETTIA A. H. Clark. 



COMANTHUS (COMANTHUS) PINGUIS, new species. 



Centro-dorsal large and hemispherical, with a concave polar area, 

 as in C. {€.) hennetti^ 10 mm. to 12 mm. in diameter. 



Cirri large and stout as in C. (C.) henneUl, usually XXXV-XLV, 

 28-34, 30 mm. to 40 mm. long, the joints in the proximal half squarish 

 or slightly longer than broad, in the distal becoming about twice as 

 broad as long; at about the twelfth the distal dorsal edge of the joints 

 begins to project, and later the dorsal surface becomes carinate, so 

 that in lateral view the cirri appear to have well-developed dorsal 

 spines. 



Division series all 4 (3+4), IIBr and IIIBr regularly, IVBr 

 rarely, present, very broad and massive, the IIBr series nearly in 

 apposition laterally. 



Usually thirty-five to forty arms 100 nnn. to 140 mm. long, the 

 brachials slightly overlapping. 



Proceedings U. S. National Museum, Vol. 37— No. 1697. 



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