642 PROCEEniNG^ OF THE NATIONAL MUSEUM. vol. xxxvi. 



joint; terminal claw slightly longer than the penultimate joint, mod- 

 erately slender, and moderately curved, rather more proximally 

 than distally. 



Radials projecting very slightly beyond the centro-dorsal, slightly 

 separated distally ; IBr^ oblong or slightly trapezoidal, four times as 

 broad as long; IBr^ (axillary) broadly pentagonal, tAvice as broad 

 as long; synarthrial tubercles moderately developed. 



Arms 10, about 80 mm. long, resembling those of C. studeri; dis- 

 tal ends of the brachials very slightly, if at all, produced. 



Pa absent; P^ 4.5 mm. long, small and slender, Avith about 1-t joints, 

 the first short, the second slightly longer, the third squarish, those 

 in the distal portion being half again as long as broad; P^ 8 mm. 

 long, stouter and still'er than P^, though not especially enlarged, with 

 15 to 17 joints, the first short, the second and third squarish, the re- 

 mainder one-third to one-half again as long as l)road, becoming again 

 somewhat shorter at the extreme tip; the joints in the distal half have 

 slightly enlarged distal ends; P^ G nun. long, less stout than P., but 

 similar to it, with 1-1 joints; P^ 5 nun. long, slightly less stout than P.5, 

 but similar, with 12 joints; P^ and following pinnules 4 mm. long, 

 about as stout as P^, but not stiffened, with 12 joints, the third squar- 

 ish, the remainder longer than broad, becoming half again as long as 

 broad in the distal half; the distal ends of the component joints are 

 slightly everted and spinous ; distal pinnules slender, 7 mm. long, the 

 joints smooth. 



Type-specimen. — Cat. No. ■^\*^, Indian Museum; off" Colombo 

 Light House, Ceylon; 2C| fathoms. 



Cotype.—Ciit. No. 25483, U.8.N.M. ; from the same locality. 



Family THALASSOMETRIDiE. 



Siibfainily TIIA.1L, ASSOlMEa^RIISr^S;. 

 Genus CROTALOMETRA A. H. Clark. 



CROTALOMETRA ANNANDALEI, new species. 



Centro-dorsal columnar, the tip truncated conical as in Af^tero- 

 metra., 5 mm. long by about 5 mm. broad at the base ; cirrus sockets 

 arranged in ten columns of usually three each, the columns of adja- 

 cent radial areas being closely crowded and more or less alternating, 

 the two columns of each radial area being separated by a slightly con- 

 cave median area of about half their width; polar area Avith five 

 more or less marked interradial ridges which terminate in five small 

 tubercles about the apex. 



Cirri comparatively slender, XXX, 62-79, 65 mm. long; first three 

 joints approximately equal, short, about twice as broad as long, the 

 following gradually increasing in length, becoming squarish on the 

 fifth or sixth and half again or nearly tAvice as broad as long on the 



