A MONOGRAPH OF THE EXISTING CRINOIDS 267 



P 3 and the pinnules succeeding have swollen pinnule bases. The distal pinnules are 

 from 4 mm. to 5 mm. in length and have 13-15 segments, which are twice as long as 

 broad, with expanded articulations. 



The disk is 3.5 mm. in diameter. 



In the second specimen from Bock's station 35 the centrodorsal is 1.8 mm. in 

 diameter. 



The cirri are about XX, 9, 4 mm. long; only a single cirrus remains. The 

 antepenultimate segment is half again as long as broad. 



The radials are concealed. The IBi^ are only visible at the margin of the centro- 

 dorsal. The IBr 2 (axillaries) are from three to four times as broad as long, with 

 strongly concave distal sides. 



The 10 arms were probably about 15 mm. long. The arms are rather smooth. 



The intersyzygial interval is 3 muscular articulations. 



P: is 4 mm. long with 26 segments of which 9 bear teeth. P 2 is 3 mm. long with 

 about 22 segments, of which 7 or 8 bear teeth. Only P t and P 2 bear combs. P 3 is 

 2.5 mm. long with 10-12 segments. 



The disk is 2.5 mm. in diameter. 



Localities. Siboga station 266; near the Kei Islands (lat. 5 56' 30" S., long. 

 132 47' 42" E.); 595 meters; gray mud with coral and stones; December 19, 1899 

 [A. H. Clark, 1918] (6, U.S.N.M., E. 409; Amsterdam Mus.). 



Siboga station 267; near the Kei Islands (lat. 5 54' 00" S., long. 132 56' 42" 

 E.) ; 984 meters; gray mud with a brown upper layer; December 20, 1899 [A. H. Clark, 

 1912, 1918] (2, Amsterdam Mus.). PI. 28, figs. 75, 76. 



Dr. Sixten Bock's station 35; off Okinose, Sagami Bay, Japan; 731 meters; 

 June 28, 1914 [Gisle'n, 1922]. 



Geographical range. From the Kei Islands northward to southern Japan. 



Bathymetrical range. From 595 to 984 meters. 



Remarks. After a detailed study of material from southern Japan, Gisle'n came 

 to the conclusion that although C. gracilipes is rather closely related to C. pan-ula 

 it can scarcely turn out to be a young form of the latter. One of his specimens of 

 C. gracilipes was mature, with well-developed genital glands, and in this the centro- 

 dorsal conceals more of the IBr series than is the case in C. parvula. 



He noted that the specimens of C. gracilipes are of more slender habit than those 

 of C. parvula and have more spiny distal pinnules. 



History. This species was originally described in 1912 from a specimen from 

 Siboga station 267. It was redescribed and figured, and recorded from station 266 

 in 1918. In 1922 Dr. Torsten Gisle'n recorded and described 2 specimens which had 

 been dredged by Dr. Sixten Bock in Sagami Bay, Japan. 



COMISSIA HARTMEYERI A. H. Clark 



Plate 28, Figures 78, 79; Plate 29, Figures 80-82 



Comanthus (Iparvicirra) A. H. CLARK, Proc. U. S. Nat. Mus., vol. 40, 1911, p. 8 (possibly occurs 

 on the northeast coast of Africa; refers in reality to Comissia harlmeyeri). 



fComanthus (Validia) parvicirra A. H. CLARK, Proc. U. S. Nat. Mus., vol. 40, 1911, pp. 18, 19 

 (specimens from the Red Sea possibly this species); vol. 43, 1912, p. 385 (these identified as 

 Comissia hartmeyeri) . 



