4 BULLETIN 115, UNITED STATES NATIONAL MUSEUM. 



Basals 3, unequal, sometimes anchylosed — Continued. 

 Calyx very large; iBr in 3 to 7 ranges. 



Anal side may be slightly differentiated above the first 

 range. 



Dorsal cuji broad, low, and flattened. 

 Tegmen low convex. 



Base small, vnth shallow concavity involving 

 radials and covered by column; basals 

 almost eliminated by atrophy. 



Arms biserial, simple, heavy and few in 

 number — about 4 to the ray; iBr in 5 

 or more ranges. 



IBr 1 Haurocrinus. 



Dorsal cup broadly rounded. 



Base deeply concave, forming an inverted cone. 

 Arms biserial, simple, small and numerous — 

 16 or 17 to the ray; iBr in not exceeding 3 

 ranges; IBr 2, the second reduced and irreg- 

 ular in form Himerocrinus, new genus. 



The material used in the following descriptions and discussions 

 and in the illustrations, unless otherwise stated, is all in the author's 

 collection now in the United States National Museum. 



COMANTHOCRINUS, new genus. 



In addition to the la^rger characters for this genus previously 

 mentioned, the following observations are pertinent: 



Fig. 1.— Com.vnthocrixus. 



// = i Br WW = i II Br 



=;n= = interpinnulais p = pimiulars 



The greatly elevated tegmen, with its cons]3icuous bulging at the 

 posterior side, and the accompanying marked differentiation of the 

 anal series, produce a wide departure from the nearly pentamerous 

 symmetiy which prevails in most of the genera of this group. The 



