2 6o 



li second brachial n«>t appreciably longer than th<- first 



proxima] portion of the arms broad, very rugged, and with the articular 



tubercles very strongl) i Hawaiian Islands) rugosus 



proxima] portion of the arms only very slightly enlarged, smooth, 

 without any ti articular tubercles (Meangis Islands and 

 Moluccas naresi 



i. Thaumatocrinus naresi (P. II. Carpenti 



1'. II. CARPENTER, Proc. Roy. Soc, vol. 28, p. ; v s ? [Promachocrinus naresi). 



■Challenger" Reports. The Comatulac p. 352, pi. 69, figs. 8 — \o (Promachocrinus naresi . 



Stat. 122. 1 s8'.5 N., r25°o'.sE. Sangi Islands, northeast of Celebes. 1264 — 1165 Metres. 

 1 mutilated Ex. 



The > i-ntrodorsal is very low hemispherical with a strongly flattened dorsal pole, and 

 measures 6 mm. in diameter. !t bears XXXVcirrus sockets in three closely crowded alternating rows. 



The ten radials are in mutual apposition all around the calyx, being 

 only slightly separated at the distal angles; they are short, projecting beyond 

 the centrodorsal for a distance equal to trom one third to one half the length 

 of the first brachial. 



H of lhc The first brachials are approximately oblong-, averaging twice as broad 



as long: the second brachials are similar, of about the same size or 

 slightly shorter. 



The arms from the distal edgfe of the radials to the distal edije of the 



of the rt ö 



fourth brachial (the first syzygy) mcasure 6 mm. 



Thaumatocrinus óorea/is, which I recently combined with Th. naresi as a synonym, 

 is in reality a perfectly good species. It is readily distinguished from the allied species by the 

 small size of the t:rst and the large size of the second brachials, the latter being nearly or 

 quite twice as large as the former. In 77/. naresi the first three brachials are all of about the 

 same size. 77/. dorealis is larger and more rinjfs/ed and robust than 77/. naresi. 



Pentametrocrinus A. H. Clark. 



Key to the Species of the Genus Pentametrocrinus. 



\ pinnule on the second brachial; cirri greatly elongated, straight for mosl 

 of the length, gently recurved at the tip, tapering to a point, composed of 

 18- 22 segments; all the cirrus segments iexcept the basal) greatly elongated; 

 terminal claw minute, conical (Baj of Bengal to the East Indies, the 



Philippine Islands and southern Japan varians 



first pinnule on the fourth brachial 



greatly elongated, itraighl for most of the length, gently recurved at 

 tip, tapering to a point, composed of 25 30 segments; all the cirrus 



