20 Clark — Seventeen New East Indian Crinoids. 



long as the diameter of the proximal end, the fourth is slightly longer, 

 and the fifth is about as long as the third; the sixth is about twice as long- 

 as the diameter of the distal end; the seventh is slightly shorter; the 

 antepenultimate is half again as long as broad, and the penultimate is 

 about as long as broad. The longer earlier segments are slightly con- 

 stricted centrally with expanded ends as is usual in the genus. The 

 dorsal processes on the outer segments are almost obsolete. 



The ten arms resemble those of C. parrula. 



Type locality.— ■" Siboga " Station No. 2t>7. 



Comissia spinosissima sp. no v. 



The centrodorsal is large, thin discoidal, the dorsal pole Hat, regularly 

 pentagonal, 2 mm. in diameter. 



The cirri are xxx, 10-11, 8 mm. long, small and slender, with rather 

 strongly produced distal edges on the shorter outer segments; the first 

 segment is very short, the second twice as long as the expanded ends, the 

 third the longest, about four times as long as the median diameter; the 

 fourth is nearly as long as the third, hut the distal end is more expanded ; 

 the fifth is twice as long as the expanded distal end ; the following gradu- 

 ally decrease in length so that the antepenultimate is about as long as 

 broad ; the second and third segments have both the proximal and distal 

 ends considerably eidarged, and are slender and broadly oval in cross 

 section ; the fourth has the proximal end only very slightly enlarged, but 

 gradually expands from the middle to the distal edge, which is produced 

 and overlaps the base of the succeeding segment; the following segments 

 gradually increase in lateral diameter, the enlargement of the distal ends 

 gradually decreasing in extent; the fifth and following segments have 

 slight snbterminal tubercles; the opposing spine is terminal, minute, but 

 larger than the tubercle on the preceding segment; the terminal claw is 

 nearly twice as long as the penultimate segment, and is strongly curved. 



The radials are concealed in the median line, but are slightly visible in 

 the angles of the calyx; the i Bn is very short, oblong, five or six times 

 as broad as long, very closely united with the succeeding axillary which 

 is triangular, twice as broad as long. 



The ten arms are 45 mm. long; the brachials resemble those of 

 C. hispida. The ossicles of the division series and the brachials have 

 their distal borders armed with very long fine spines; the pinnulars are 

 exceedingly spinous, and the third has a slight, very spinous, carina- 

 tion. 



Type locality.— "Siboga" Station No. 305. 



Comatula tenuicirra sp. nov. 



This form is closely related to C. purpurea from which it differs in 

 possessing longer and more slender cirri. 



In the type the cirri are x (in interradial pairs), 14-15, 13 mm. to 

 15 mm. long; the first segment is short, the second nearly as long as 



