Echinoidea and Asteroidea from Mergui Archipelago. 35 



In its somewhat irregularly arranged plates and unequal arms these 

 recall the specimens from the Red Sea mentioned by Perrier. 



Eecorded from the Eed Sea, Ceylon, Madagascar, and Mauritius to the 

 Loo Choo Islands, the Moluccas, New Caledonia, Samoa, and the Fiji Islands. 



18. Retaster cribrosus (von Mart.). 

 Sladen, "Challenger" Reports, xxx. p. 482, pi. lxxvi. figs. 3 and 4 ; and lxxvii. figs. 11, 12. 



Localities. — II., Iron Island, 10 to 25 fathoms, stones and mud ; XXIII., Five 

 Islands, 12 fathoms, rock and sand ; XXIL, Hastings Harbour, St Luke's 

 Island, 15 to 20 fathoms, sand and shell. 

 Several specimens, including a young one, in which 11=18 and r = 7. 

 Known from Zanzibar and Mozanibicpae to Ceylon, Singapore, the 

 Philippines, and Samoa. 



19. Echinaster purpureus (Gray), Bell. 

 Echinaster fall ax, M. & T., Perrier, loc. cit., iv. p. 370. 

 Localities. — IX., Courts to Bentinck Islands, 12 to 26 fathoms, coral and 

 sand ; XVI., Alligator Rock, 8 to 18 fathoms, rock and sand ; XVII., 

 Malcolm to Charlotte Islands, 18 fathoms, coarse sand ; XVI II., Off 

 Paway Island, 10 to 21 fathoms, sand and shell; and XXIL, Hastings 

 Harbour, St Luke's Island, 15 to 20 fathoms, sand and shell. 

 Nine specimens, varying in size from a very young one in which .K =13 

 to a large one in which E = 82 and r = 6. 



Throughout the Indian Ocean and South-Western Pacific. 



(Issued separately, \lth February 1910.) 



