Clark — Seventeen New East tndian Crinoids. 23 



becomes subterminal, remaining as a narrow serrate ridge which may be 

 more or less raised in the center; on the fifth after the transition segment 

 a small low tubercle appears midway between this ridge and the proxi- 

 mal end of the segment which on the outer segments becomes pointed so 

 that in lateral view the dorsal surface of the segment is hidentate as in 

 Oligometra adeona ; the longer proximal segments are slightly constricted 

 centrally with prominent ends; proximal to the transition segment the 

 cirri are brownish yellow, distal to it white and highly polished. 



The arms are forty in number, 95 mm. long; all the 11 Br series are 4 

 (.".4-4) and all the m Br series are2; there is no division beyond the in Br 

 series. The division series are moderately broad ami well rounded dor- 

 sally, moderately separated; the dorsal interradial perisome contains 

 small scattered inconspicuous plates; the brachials are moderately over- 

 lapping. 



Type locality. — "Siboga" Station No. 49a. 



Comantheria rotula sp. nov. 



This form is intermediate between C. briareus and ('. weberi ; it exhibits 

 the post-radial structure of the latter, hut possesses the centrodorsal and 

 cirri of the former. 



The centrodorsal is greatly reduced, usually with a few weak cirri, 

 though there may he none. 



The arms are forty in number, in the type 150 nun. long; the II Br 

 series are 4 (."> + 4) and the m Br series L' ; there is no further division. 

 The dorsal surface of the animal is smooth, with comparatively little 

 overlap to the brachials, and the rugged appearance characteristic of 

 brian us i- entirely absent. 



Type locality. — "Siboga" Station No. 273. 



Comanthus crassicirra sp. nov. 



This species is related to C. japonica, and is the first member of the 

 -mall group to which C. japonica belongs to he hrought to light south, of 

 Japan. 



The centrodorsal is flattened hemispherical, the small dorsal pole fiat, 

 •_' luni. in diameter; the cirrus sockets are arranged in one and a partial 

 second irregular marginal row. 



The cirri are xvn, 22-24, 24 mm. long; the first segment is short, the 

 following gradually increasing in length so that the fourth is nearly or 

 tpiite as long as broad and the fifth and sixth or sixth and seventh, which 

 are the longest, nearly or quite half again as long as broad ; the following 

 segments gradually decrease in length so that the terminal eight or ten 

 are slightly broader than long; the twelfth or thirteenth and following 

 have small subterminal dorsal tubercles; the shorter distal segments are 

 slightly compressed laterally and have a highly polished surface, though 

 this begins gradually so that there is no marked transition segment; the 

 opposing spine is small, low and broad, median or subterminal. As a 

 whole the cirri are large, long and stout, resembling those of C. japonica. 



