A MONOGRAPH OF THE EXISTING CRINOIDS 221 



the second both distally and proximally well beyond the end of the segment; the 

 following: segments are small and slender. The following pinnules are somewhat 

 stouter and taper evenly from the base to the tip, the first 2 segments not being 

 appreciably different from the others. The pinnules in the middle of the arm are 

 12 mm. long. 



The disk is about 25 mm. in maximum diameter and is without visible calcareous 

 deposits. The mouth is marginal and radial. 



A second specimen taken with the type and included with it in the original 

 description has 23 arms, which, according to Mr. Springer, originally measured 

 about 130 mm. in length. All of the IIBr series are 4 (3+4). Of the three IIIBr 

 series present, two are 3 (2 + 3) and one consists of a single axillary ossicle. 



Notes. As a postscript to his discussion of the comasterids of the Fimbriata 

 group, Dr. P. H. Carpenter mentioned a very remarkable specimen which was 

 dredged by the Blake in the Caribbean Sea, just where he does not state. He says 

 that at first sight it greatly resembles a large example of Nemaster lineata, to which 

 it is very closely allied, but the IIIBr series are represented by single axillary 

 ossicles, and the IVBr series may be of the same character, or they may be 2 (1+2). 

 On the outer arms of each ray the first syzygy is generally between brachials 2 + 3, 

 and this is sometimes the case also on the inner arms; but the other arms generally 

 have the first syzygy between brachials 1+2. 



The specimen from Dominica has the centrodorsal rather large, discoidal, with 

 the dorsal pole flat; there is a single marginal row of cirrus sockets. The cirri are 

 about XV, 14, 10 mm. long, with the earlier segments elongated and the distal short 

 and compressed. The radials are just visible. The IBr series are short and broad, 

 but well separated laterally. The IIBr series are 4 (3 + 4). The IIIBr series usually 

 consist of a single axillary ossicle, but are rarely 2 (1 +2). The 40 arms are about 

 100 mm. long. In arms arising from a IIIBr 1 series the first syzygy is between 

 brachials 1+2; in arms arising from a IIIBr 2 (1+2) series the first syzygy is 

 between brachials 2 + 3. 



In the specimen from the Engineers' Pier, Bridgetown, Barbados, the centro- 

 dorsal is very thin, discoidal, with the flat dorsal pole 5 mm. in diameter, having a 

 slightly depressed circular area 2 mm. in diameter in the center. The cirri, which 

 are arranged in a single very irregular marginal row, are XXII, 13-15, 13 or 14 mm. 

 long. The 43 arms are about 90 mm. long. 



In the specimen apparently from Blake station 155-156 as described by Hart- 

 laub the centrodorsal is broad, thin discoidal. The cirrus sockets are arranged in 

 2 rows. 



The cirri are XXXVII. The mature cirri are all broken; an immature cirrus has 

 12 segments. In the stumps of the mature cirri only the basal segment is short, 

 the second being elongated, and the third, fourth, and fifth the longest; from this 

 point the length rapidly decreases, so that the eighth is about as long as broad. The 

 proximal-segments as far as the seventh are constricted centrally, and those follow- 

 ing are laterally compressed. The distal segments bear slight dorsal spines. The 

 opposing spine is very small, but in contrast to this the terminal claw is large. 



