284 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



P] is 15 mm. long, moderately stout in the proximal half, becoming slender 

 in the distal half. It is composed of 25 segments of which the first is half again as 

 broad as long, the second is twice as broad as long, the third is half again as broad as 

 long, and those following gradually increase in length, becoming about as long as 

 broad in the middle of the pinnule, and twice as long as broad terminally. The 

 pinnule is strongly prismatic, and when viewed from the side toward the arm tip 

 shows a well marked, though low, longitudinal crest. P 2 is of about the same length as 

 PI and is composed of 25 segments. It resembles PI but tapers more gradually so that 

 it appears somewhat stouter in the distal half. P 3 is 15 mm. long with 26 segments, 

 slightly stouter than P 2 with a somewhat more prominent dorsal crest and with the 

 distal ends of the segments on the side toward the arm base slightly produced. It 

 bears a long fusiform gonad extending to the sixteenth segment. The next three or 

 four pinnules are similar, and those following very slowly decrease in length, the 

 twentieth being 9 mm. long with 23 segments. The distal pinnules are exceedingly 

 slender and hairlike, about 20 mm. long with 57 segments. 



The disk is 25 mm. in diameter and is not incised. The five ambulacral grooves 

 running from the mouth usually fork about halfway between the mouth and the 

 periphery of the disk, though sometimes nearer the latter. In two specimens the 

 individual arms of the anterior and right anterior pairs are supplied with grooves 

 arising directly from the peristome, so that seven groove trunks radiate from the 

 mouth, three forking and four remaining undivided. 



The color in alcohol is purplish brown, with the arms in the outer half or two- 

 thirds narrowly and abundantly banded with dull orange-yellow. 



Notes. The preceding description is based upon five specimens from near 

 Mandapam. 



In the specimen from Pamban Beach the cirri are XXV, 26; the cirrus segments 

 are subequal, usually about half again as broad as long, but hi some cirri nearly or 

 quite twice as broad as long. 



In one of the specimens from Madras, station 5 (No. 14), the cirri are XXV, 26, 

 from 25 to 27 mm. long. All the cirrus segments are subequal, all being about twice 

 as broad as long. The lower brachials have a narrow but well developed median 

 carination which rises rapidly from the proximal to the distal end so that in lateral 

 view the dorsal profile of the arms is very strongly serrate. After the proximal 

 quarter of the arms this gradually dies away, becoming obsolete and almost completely 

 disappearing in the outermost portions of the arms, though very faint suggestions of 

 it remain. The color is light purplish brown finely mottled with dull yellowish, most 

 abundantly on the division series and proximal fourth of the arms. The cirri are 

 dull yellowish, becoming more or less brownish ventrally. 



In another specimen from Madras, station 5 (No. 33), the cirri are XXV, 23-24, 

 from 20 to 22 mm. in length. The cirrus segments are subequal, half again as broad 

 as long, or twice as broad as long, or the earlier segments are from half again to twice 

 as broad as long and the distal portion of the cirri is slightly broadened in lateral view, 

 with the segments shorter, up to two and one-half times as broad as long. The color 

 is light dull yellowish, the arms mottled with purplish brown for the first 20-25 mm., 

 then narrowly banded, the bands involving two or three brachials and being separated 

 by four or five. 



