Echinoidea and Asteroidea from Mergui Archipelago. 23 



It is noticeable that at Iron Island this species flourishes in rock pools, 

 away from any coral reefs, contrary to its usual habit. 

 Known from the Atlantic, Indian, and Pacific Oceans. 



3. Echinothrix turcarum, Ret. 

 A. Ag., Rev. Ech., p. 416. 

 Locality. — VIII., Port Maria, Elphinstone Island, 3 fathoms, fine sand. 



The spines of this species are but slightly hollow as a rule : in this 

 specimen, however, they are hollow throughout and very nearly approach 

 the spines of E. calamaris. The ambulacral areas are markedly gibbous 

 near the abactinal area. 



Height, 27 mm. ; diameter, 55 mm. ; longest spine, 56 mm. 

 Distributed in the Indian Ocean and Pacific to Japan and Fiji. 



4. Astropyga radiata, Gray. 

 A. Ag., Rev. Ech., p. 420. 



Locality. — XXXIL, Bentinck Island, 29 fathoms, soft mud. 

 A single small specimen, almost bare of spines. 

 Known from Zanzibar and Mozambique to the Philippines. 



5. Asthenosoma Grubei, A. Ag. 

 A. Ag., Proc. Amer. Acad., xiv. p. 200 (1879). 



Locality. — XIV., Bushby Island, 15 fathoms, rock and sand. 



A single dry specimen in perfect condition, agreeing with the "Challenger " 

 specimen as described and figured by Sladen (" Challenger " Reports, iii. 

 p. 82, and pis. xv., xvi., xvii., etc.). It may be identical with Asthenosoma 

 varium from the China and Java Seas, but Grube's description of that species 

 is too vague and general to be of much value to systematists. 



Not previously known from the Indian Ocean, and apparently only 

 recorded from the Philippines and Dutch East Indies. 



6. Echinometra lucunter, de Blainv. 

 A. Ag., Eev. Ech., p. 431. 

 Locality. — VIII., Port Maria, Elphinstone Island, 3 fathoms, fine sand. 



Two small specimens in perfect condition. The spines are light-green and 

 olive-green respectively (in alcohol), and are tipped with straw colour ; a few 

 narrow abruptly towards their extremities. 



Distributed in the Indian and Pacific Oceans. 



