314 ECHINODERMA OF THE TNDIAN MuSEUM, PART VII. 



3'5 mm. in diameter slightly excavated in the centre; cirrus sockets arranged in 

 a single irregular marginal row. 



Cirri XXIV, 12-14, 10 ram. long; tlic fourth and fifth cirrus segments are 

 the longest, two to two and one half times as long as broad proximally : tlie 

 sixth and following segments bear minute subterminal dorsal spines. 



The radials are concealed by the centrodorsal : the TBr series are very widely 

 separated laterally. 



The ten arms are about oO mm. long, and resemble those of Comissia hispidd, 

 but are a trifle more slender. 



The terminal combs on the lower pinnules appear to have twenty-six or 

 twenty-eight teeth. 



Locality.— 0_;^ the northeast coast of Ceylon (8° 51' 30" N. lat., Sl° 11' 32" E. 

 long.) ; 28 fathoms. — One specimen. 



Remarks.^ — Chadwick's specimen was dredged south of Galle, about 12 miles 

 from land, in about 100 fathoms; judging from his figure the cirrus segments 

 seem to number 13. 



This species is most closely related to C. hispida from the Pliilippine Islands, 

 agreeing with that form in the .shape and proportionate size of tlie centrodorsal. 

 It has, however, a greater number of cirrus segments. 



COMISSIA HARTMEYERI, sp. nov. 



Description. — Centrodorsal thin-discoidal. the dorsal pole flat, about 1 mm. 

 in diameter. 



Cirri VIII-XIV (usually about X), 10-13 (usually 12 or 13), 4-5 mm. to 

 6 mm. (usually about 5 mm.) long. The first segment is short, the second about 

 as long as broad, the third from two to three times as long as its median dia- 

 meter ; the fourth segment is the longest, three and one half to four times as long 

 as the median diameter; the fifth is not quite so long; the following segments 

 rapidly decrease in length, so that the ninth and following are about as long as 

 broad ; the fifth is a transition segment : the longer proximal segments are oval 

 in cross section and are strongly ' ' dice-box shaped,"' but the outer short segments 

 have straight sides and are strongly compressed laterally, therefore appearing 

 broad in lateral view. The transition and following segments have the distal 

 dorsal edge everted, forming a minute sharp tubercle in lateral view, at first 

 subterminal but becoming median on the antepenultimate : the opposing spine 

 is represented by a minute median tubercle only slightly larger than the tubercle 

 on the preceding segment : the terminal claw is sUghtly longer than the penulti- 

 mate segment, rather stout, and strongly curved, more so basally than distallj'. 



The radials are even with the edge of the centrodorsal in the median line, 

 but extend up interradiaUy and entirely separate the bases of the IBr^ ; the IBr 

 series are widely separated, their sides making nearly a right angle with the sides 

 of the adjacent TBr series. Tiie union of the elements of the TBr series is veiy 

 close, appearing almost like a syzygy in external view. 



