258 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Investigator station 175; off the northeast coast of Ceylon (lat. 8° 51' 30" N., 

 long. 81° 11' 52" E.); 51 meters; sand, shells, and stones; April 20, 1894 [A. H. Clark, 

 1912] (1, I. M.). PI. 65, fig. 185. 



Remarks. — Among the specimens recorded under the name of Actinometra 

 parvicirra from Ceylon in 1904 by Mr. Herbert C. Chadwick was a 10-armed indi- 

 vidual. He noted that in the form and disposition of the elements of the IBr series 

 this differed markedly from the other specimens in the collection and also from those 

 fis;ured by Carpenter. Of this specimen he gave a figure of the dorsal aspect and 

 another of the disk. 



I recognized this specimen as in reality representing a species of Comissia, and 

 referred it to that genus in 1911. 



A similar specimen was found in the Investigator collection, and this I described 

 in 1912 under the name of Comissia chadmcJci. 



COMISSIA HISPIDA A. H. Clark 



Plate 29, Figure 83 

 Comissia hispida A. H. Clahk, Proc. U. S. Nat. Mus., vol. 39, 1911, p. 531 (description; Albatross 

 station 5431); Ann. and Mag. Nat. Hist., ser. 8, vol. 7, 1911, p. 645 (listed, with habitat); 

 Proc. Biol. Soc. Washington, vol. 25, 1912, p. 19 (compared with C. parvula); p. 20 (brachials 

 compared with those of C. spinosissima) ; Crinoids of the Indian Ocean, 1912, p. 77 (synonymy; 

 locality); Unstalked Crinoids of the Siboga Exped., 1918, p. 19 (in key; range); p. 20 (descrip- 

 tion; station 260); p. 275 (listed). 



Diagnostic features. — The cirri are XXII, 9-10, 8 mm. long; the longest cirrus 

 segment is about four times as long as broad, and the distal segments are about as 

 long as broad. The arms are probably about 60 mm. long. The IBri are from six 

 to eight times as broad as long, but the axillaries are not greatly broader than long. 

 Pi is from 12 to 14 mm. long and bears a comb composed of 15-17 long curved teeth 

 which are basally very close together. Combs occur to and tncludiug Pj. 



Description. — The centrodorsal is thin discoidal with the dorsal pole flat, 3.5 

 mm. in diameter. The cirrus sockets are arranged in a single fairly regular mar- 

 ginal row. 



The cirri are XXII, 9-10, 8 mm. long. The first segment is very short, the second 

 is about twice as broad as long, and the third is the longest, about four times as long 

 as the proximal width, and is a transition segment. The foUowmg segment is about 

 twice as long as broad, and the remainder are about as long as broad. The second 

 segment has both ends somewhat expanded. The third has the distal end somewhat 

 expanded, but this feature dies away on the succeeding segments. The segments as 

 far as the third are well rounded in cross section, but those following are laterally 

 flattened, so that they appear considerably broader in lateral view. The fourth and 

 foUowing have small subterminal dorsal tubercles. 



The mouth is subcentral and the anal tube submarginal. 



The ends of the basal rays are visible as small tubercles in the interradial angles 

 of the calyx. 



The radials are concealed by the centrodorsal in the median line, but are visible 

 interradially as broad low tubercles. The IBri are exceedingly short, from six to 

 eight times as broad as long. The IBrj (axillaries) are triangular, not greatly broader 

 than long, with the anterior angle acute and somewhat produced. 



