650 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The specimen from Bock's station 63 was determined by GisleYi as Comanthus 

 parvicirra a comasteripinna. As described by him the centrodorsal is 1.9 mm. in 

 diameter, the free dorsal pole being 1.6 mm. across. There is a single row of 17 cirrus 

 sockets. 



The cirri are absent. 



The radials are narrow bands, almost concealed in the middle. The IBri are 

 three times as broad as long, and are free laterally. The IBr 2 (axillaries) are twice 

 as broad as long, pentagonal, 1.3 mm. in width. The 4 IIBr series present are 4 (3 + 4). 

 The first ossicles following each axillary are basally united interiorly. The IIBr] are 

 five times as broad as long. The IIBr 2 and the second brachials are distally and 

 dorsolaterally broader. 



The 14 arms are 20 mm. in length. The brachials beyond the fourth are distally 

 everted, the eversions being armed with small spines. There are 20 brachials for each 

 10 mm. of arm length, or 16 if the syzygial pairs be counted as units. 



Syzygies occur between brachials 3 + 4, 10+11, etc., and distally at intervals of 

 3 or 4 muscular articulations. 



PI bears a comb composed of 8-10 large teeth; the tip of the pinnule is not 

 smooth. P 2 is similar, somewhat shorter, 3 mm. long. P 3 is about 3 mm. long with 

 12 segments, and is a little swollen basally (?by a gonad). The proximal pinnules are 

 weakly carinate. The distal pinnules are 3.5 mm. long with 12-14 segments which 

 are stout and short, distally bearing dorsal hooks. 



The disk is 5 mm. in diameter. The dorsal perisome is visible in the inter- 

 spaces, about 0.5 mm. in width, between the division series. The anal tube is central. 



The color is yellow brown. 



Gisl^n remarked that this specimen is most probably referable to Comanthus 

 parvicirra y vaniipinna, represented in Mortensen's collection from Sagami Bay. 



The specimen from Mortensen's station 1 was described by Gisle'n under the 

 name of Comanthus parvicirra 7 vaniipinna. The diameter of the centrodorsal is 

 3.2 mm. 



The cirri are XVIII, 15-16, from 8 to 10 mm. long. 



The radials are concealed. The IBr t are short and broad. The IBr, (axillaries) 

 are twice as broad as long, with the distal angle produced. The IIBr and IIIBr 

 series are 4 (3+4). The width of the IIBri is 1.7 mm.; these ossicles are interiorly 

 almost free from each other. The division series lie very close together. 



The 21 arms are 45 mm. in length and are rather stout. There are 16 brachials 

 to each 10 mm., or 13 if the syzygial pairs are counted as units. 



The distal intersyzygial interval is 4 muscular articulations. 



P D is 11 mm. in length. The comb, which extends to the extreme tip of the 

 pinnule, is composed of 12-13 double teeth. P, is 9 mm. long and bears a comb 

 consisting of 9 teeth. P 2 is 6 mm. long; its comb has 7 teeth. P 3 bears a gonad, and 

 is sometimes without a comb. P 4 and P 6 bear combs. P 6 and the following pinnules 

 are without combs. The proximal portion of the distal profile of the earlier pinnules 

 is serrate, as a result of the development of distal prominences on the segments. 

 The gonads are large. 



