A. H. CLARK : THE CRINOIDS OF THE INDIAN OCEAN. 203 



Description. — This new form is most nearly related to Th. magnicirra aud 

 to Th. rustica ; while of the same arm length or even somewhat larger tiian the 

 latter (150 mm. to 160 mm. arm length) it is more slender, the arms are fewer in 

 number (twelve to sixteen), the cirri are shorter and less stout, with fewer seg- 

 ments (XX, 59-62, 50 mm. long), and the brachials after the proximal third of 

 the arm bear long overlapping spines which are more or less flattened dorso- 

 ventrally and rounded or truncated at the tip. 



The colour in spirits is light yellowish brown. 



LoCAiATY.—Laccadive Islands (10° 47' 45" N. lat., 72° 40' 20" E. long.; 

 Station No. 124); 703 fathoms; large water worn jragments of reef coral. — Two 

 badly broken specimens. 



THALASSOMETRA INFELIX. 

 Crotalometra infelix 1911. A. H. Clark, Proc. U. S. Nat. Mus., vol. 39, p. 550. 

 Habitat. — Philippine Islands. 

 Depth. — 230 fathoms. 



THALASSOMETRA GIGANTEA. 



Thalassometra gigantea 1908. A. H. Clark, Proc. U. S. Nat. Mus., vol. 34, 

 p. 222. 



Habitat. — Hawaiian Islands. 

 Depth.— 430-477 fathoms. 



THALASSOMETRA HAWAIIENSIS. 



Antedon hawaiiensis 1907. A. H. Clark, Proc. U. S. Nat. Mus., vol. 33, p. 152. 

 Thalassometra hawaiiensis 1907. A. H. Clark, Smiths. Miscell. Coll. (Quarterly 



Issue), vol. 50, part 3, p. 360. 



Habitat.— Hawaiian Islands. 



Depth. — 298-351 fathoms. 



THALASSOMETRA VILLOSA. 



Antedon villosa 1907. A. H. Clark, Proc. U. S. Nat. Mus., vol. 33, p. 138. 

 Thalassometra villosa 1907. A. H. Clark, Smiths. Miscell. Coll. (Quarterly Issue), 



vol. 50, part 3, p. 360. 



Habitat. — Western Aleutian Islands, Territory of Alaska. 



Depth. — 1046 fathoms. 



THALASSOMETRA AGASSIZII. 



Antedon agassizii 1895. Hartlaub, Bull. Mus. Comp. ZooL, vol. 28, No. 4, 

 p. 131, pi. i, figs. 4, 7, 8; pi. ii, figs. 16, 18, 19; pi. iii, fig. 23. 



