432 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



on the fifth and sixth brachials. In indica, however, PI is much smaller than P 2 , as 

 is well shown in Smith's figure, while in spicata it may nearly equal its successor in 

 length, though it is far more slender. In tuberculata it is also short, though stiffer 

 than in the other two forms. 



Carpenter said that tuberculata approaches spicata in the character of P 3 , which 

 is composed of elongated segments like those of P 2 and not of numerous smaller seg- 

 ments as in indica. In some arms of spicata P 3 is smaller on the outer than on the 

 inner side of the arm that is, P 3 is smaller than P . But the component segments 

 of these large and stiff pinnules have not the extreme length that they reach in 

 tuberculata. He remarked that the characters of this Mergui example of spicata 

 confirm his separation of this species from tuberculata, for the latter has but 12 seg- 

 ments m a P 2 that reaches 15 mm. in length, while in spicata a pinnule of the same 

 length consists of 16 segments or more. In both alike, however, the division series 

 have marginal projections that seem to be absent in indica. But the cirri of tuber- 

 culata are stouter though with a somewhat smaller number of segments than occur in 

 spicata. The type specimen of spicata has no IVBr axillaries, but one occurs in the 

 Mergui specimen. 



The specimen recorded by Chadwick from Ceylon at station XXXIX was con- 

 siderably mutilated. It had 11 arms. In most cases P 2 agreed well with P 2 in the 

 type specimen of marginata, seeming to have been broken off by some accident and 

 incompletely repaired. 



Chadwick said that a small specimen from Welligam Bay (station XXXIV) may 

 possibly belong to this species (marginata). The number of arms can not be deter- 

 mined, but in one of the postradial series the outer face of the IIBr axillary bears 

 two IIIBr series. 



The specimen from Mabahiss station 10 has 20 arms 105 mm. long. The two 

 cirri remaining have 18 and 20 segments; the longest is 16 mm. long. P 3 may resemble 

 P 2 and be of the same size, though usually it is smaller, or it may be more or less 

 reduced and weak, resembling, or approximating in appearance, P.J. P 2 is composed 

 of 17 segments and is slender and delicate distally instead of stout and spinelike as 

 usual. This specimen is more or less intermediate between spicata and indica, though 

 more like the former. 



One of the specimens without locality (Berl. M., 5287) is large with 33 arms 100 

 mm. long. The cirri are XXXV, 18-25 (usually the latter), 15 to 25 mm. long, the 

 peripheral cirri being the longest. The first two segments are very short, and those 

 following gradually increase in length so that the fourth or fifth is about as long as 

 broad. Those succeeding are about as long as broad or slightly longer than broad, 

 after the middle of the cirrus gradually becoming shorter so that the segments in the 

 outer third are slightly broader than long. The short distal segments are strongly 

 compressed laterally and bear a faint median dorsal carination. There are no dorsal 

 spines. The opposing spine is prominent, subterminal, and directed obliquely forward. 

 The terminal claw is slightly longer than the penultimate segment and is stout and 

 rather strongly curved. The sides of the ossicles of the division series are ventro- 

 laterally produced into prominent flangelike borders, which, however, are com- 

 paratively narrow. P] is 10 mm. long, slender, and flagellate, composed of 20 segments, 

 of which the first is twice as broad as long, the third is about as long as broad, and 



