396 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.43. 



Family STEPHANOMETRID^E. 



STEPHANOMETRA TUBERCULATA (P. H. Carpenter). 

 [For the synonymy, see The Crinoids of the Indian Ocean.] 



1. New Guinea; Cat. No. 5347. — One specimen with 15 arms 

 about 60 mm. long; one IIIBr series is developed (externally); P^ is 

 9 mm. long with 10 greatly elongated segments; Pg is similar to it, 

 but smaller, 6 mm. long, with 8 segments; P^ has 8 segments of 

 which the outer resemble those of the preceding pinnules; it is 4 mm. 

 long and slightly stiffened; P, and P3 are comparatively slender, 

 possibly because of the small size of the animal. 



2. No locality; Cat. No. 5287. — One large specimen with 33 arms 

 100 mm. long. 



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

 (the latter the length of the peripheral cirri); the first two segments 

 are very short, the following gradually increasing in length so that 

 the fourth or fifth is about as long as broad; the following are about 

 as long as broad or slightly 1-onger 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; tlie opposing spine is promi- 

 nent, subterminal, directed obliquely forward; the terminal claw is 

 slightly longer than the penultimate segment, stout, rather strongly 

 curved. , 



The sides of the ossicles of the division series and of the first two 

 brachials are produced into prominent flangelike borders which, how- 

 ever, are comparatively narrow. 



Pi is 10 mm. long, slender and flagellate, with 20 segments of which 

 the first is twice as broad as long, the third about as long as broad, 

 and the following gradual!}" increase in length so that the distal are 

 three times as long as broad; Pg is stout and very stiff, 13.5 mm. 

 long with 14 segments of which the first is twice as broad as long, the 

 third somewhat longer than broad, the fourth half again as long as 

 broad, the fifth twice as long as broad, and the remainder nearly three 

 times as long as broad; P3 is 9 mm. long Avith 10 segments, similar to 

 Pj, but with the segments proportionately more elongated; P4 is 

 small, slender and weak, 4.5 mm. long with 11 segments. 



3. No locahty; Cat. No. 5288. — One specimen. 



The centrodorsal is low hemispherical, about 5 mm. in diameter at 

 the base, the dorsal pole 1.5 mm. in diameter, approximately flat, 

 studded with small deep pits representing obsolete cirrus sockets. 



The cirri are XXVII, 21-22, 20 to 25 mm. long, arranged in two 

 and a partial third closely crowded alternating marginal rows; the 



