452 Bl U.ETIN 82, UNITED STATES NATIONAL MUSEUM 



(violet) colored than the remaining portion, and therefore very conspicuous. More- 

 n\ er, here and there cross hands that are broader than usual occur. 



The specimen from Singapore is large with 31 arms 100 mm. long and in general 

 resembles the one from the Tonga Islands. The cirri are XXVIII, 20-23, from 15 

 to 20 mm. long. The III Br scries are developed externally in 2,1,1,2 order. P, is 

 very slender, 12 or 13 mm. long, with 22-27 segments. P a is very stout and stiff, 

 15 mm. long, with 12 or 13 segments. P 3 is 7 mm. long, slightly stouter basally than 

 1',, rapidly tapering, with 12 segments. P 4 and the following pinnules are small and 

 weak, 4 mm. long, with 10 segments. 



The specimen from the Nicobar Islands has exactly 20 arms 105 mm. long, the 

 delicate and feathery distal portions of which are remarkably well preserved. The 

 cirri are XXI, 18-19, from 15 to 17 mm. long. The first segment is short, and those 

 following increase in length to the fourth, which is about as long as broad. The seg- 

 ments succeeding are at first about half again as long as broad, later decreasing in 

 length and becoming about as long as broad after the tenth. There are no dorsal 

 spines or tubercles. The opposing spine is small, terminally situated, and directed 

 obliquely forward. The terminal claw is longer than the penultimate segment and is 

 slender and moderately curved. The long earlier segments of the cirri are somewhat 

 constricted centrally. Pi is small, 7 mm. long with about 18 segments. P 2 is much 

 enlarged, stiff and spinelike, 12 mm. long, with 14 segments. P 3 is only 5 mm. long. 



The specimen from Port Blair, Andaman Islands, has 30 arms 90 mm. long. 

 P 2 is 12 mm. long, with 12 or 13 segments. 



The specimen from the Andaman Islands has 19 arms 70 mm. long. P 2 has 11 

 or 12 segments. 



Of the two specimens examined from Tuticorin, Madras, one is large, and the 

 other is a beautiful example with 30 arms 110 mm. long; P 2 is rather longer than usual, 

 and is composed of 15 or 16 segments. 



The five specimens from Investigator station 175 are all small. One has 13 

 arms 70 mm. long and P 2 10 mm. long, with 15 or 16 segments. Another is similar, 

 with 16 arms. The third has 20 arms 50 mm. long; P 2 has 14 or 15 segments. In 

 one Pi has 15 segments. 



Most of the 10 specimens from Ceylon that Reichensperger studied were large. 

 The smallest had 24 arms 75 mm. long. All the others had 27-30 arms 85 to 95 mm. 

 long. The cirri were XXX-XL, 20-27, agreeing with Hartlaub's description; there 

 were no traces of dorsal processes. The long and rigid P 2 , which is sometimes slightly 

 recurved distally, may reach a length of 17 mm., but generally it is not over 15 mm. 

 long; it is composed of 12-18 (usually 12-14) segments. The color in alcohol varies 

 from blackish or chocolate brown to light brown, and is often darker ventrally than 

 dorsally. Commonly the dorsal skeleton is light brownish with the articulations 

 dark brown. 



The specimen from Hulule, Male, Maldives, has 30 arms about 85 mm. long; 

 as is usual in specimens of species of this genus having 30 arms, all the IIIBr series are 

 externally developed. The cirri are XXIX, 22-23, 20 mm. long. P 2 is 14-16 mm. 

 long with 13-15 segments. P 3 is small and weak like P«, and is not more than half 

 as long as Pi. This specimen is very similar to the somewhat larger one from Tuti- 

 corin mentioned above. 



