198 ECHINODERMA OF THE INDIAN MuSEUM, PART VII. 



sharply rounded dorsally, and in the outer half very narrow and very sharply 

 rounded dorsally, though not really carinate ; after the basal third of the arms 

 the brachials develop slightly projecting and finely spinous distal edges. The 

 dorsal (but not the dorsolateral) side of the fourth and following brachials is 

 covered with fine short spines which gradually become coarser after the proximal 

 third of the arm and tend to arrange themselves in longitudinal lines ; segments 

 of the division series and arm bases with strongly denticulate borders. Syzygies 

 occur between the third and fourth brachials, again between the twenty-fifth and 

 twenty-sixth to thirty-fifth and thirty-sixth (usually in the vicinity of the 

 twenty-ninth), and distally at intervals of from five to seventeen (usually seven 

 to ten) oblique muscular articulations. 



Pd 12 mm. long, moderately stout in the proximal half but becoming slender 

 distally, with about twenty segments, all of which are approximately as long as 

 broad and the basal two-thirds of which are strongly carinate ; P, 10 mm. long, 

 similar to Pd , but less stout basally; P.^ 6 mm. long, much more slender than 

 Pp tapering evenly from the base to the tip, with fifteen segments, the proximal 

 four or five squarish, then becoming longer than broad and about twice as 

 long as broad terminally. Pg similar, 6 mm. long ; P^ and following pinnules 

 5 mm. long with about thu-teen segments, less slender distally than the preced- 

 ing ; the segments have slight overlapping spines developed on the distal edge 

 along the dorsal crest; distal pinnules 10 mm. long, rather slender, with about 

 twenty segments, the first short and crescentic, the second trapezoidal, about as 

 broad distally as its median length, the following half again as long as broad, 

 the terminal four or five disproportionately small ; the dorsal crest is sharp and 

 somewhat spinous. 



The colour in spirits is brownish white ; living specimens are bright yellow. 



Locality. — Malay Archipelago; 30 fathoms. — Two specimens. 



Other Records. — Phihppine Islands. 



Depth. — 180 to 279 fathoms. 



THALASSOMETRA MAGNICIRRA. 



Antedon magnicirra 1905. Bell, Marine Investigations in South Africa, vol. 3, 

 p. 141, pi. iv. 

 Habitat. — South Africa. 

 Depth.— 300-450 fathoms. 



THALASSOMETRA RUSTICA. 

 Crotalometmrnstka^90Q. A. H. Clark, Proc. Biol. Soc. Washington, vol. 22, 



p. 80. 



Description.— Ccntrodorsal apparently as in T. )iiagnkirm, with the cirrus 

 sockets arranged in ten columns, two in each radial area. 



