Echinoidea and Asteroidea from Mergui Archipelago 21 



II. — Echinoidea and Asteroidea from the Mergui Archipelago and 

 Moskos Islands, Lower Burma. By R. N. Rudmose Brown, D.Sc. 



(Received 12th October 1909. Read 22nd November 1909.) 



The material which forms the subject of the present paper was collected by 

 Mr James J. Simpson and myself, during our investigation of the pearl-oyster 

 fisheries of the Mergui Archipelago on behalf of the Indian Government in 

 1907. 



Previous to this, the only published record of Echinoids and Asteroids 

 from the Mergui Archipelago was to be found in papers 1 by Prof. P. Martin 

 Duncan and Mr W. P. Sladen, founded on material obtained by Dr John 

 Anderson in 1882. From the Moskos Islands several species of Echinoderms 

 are recorded by Dr A. K. S. Anderson in the Surgeon Naturalists Report 

 for the season 1898-1899 (Eeport of the Marine Survey of India, 1899). 

 The present collections would have been larger if time and opportunity had 

 permitted, for the fauna of the Archipelago is clearly a rich one, but both 

 Mr Simpson and myself had to concentrate all our attention on the pearl 

 oysters and questions immediately relating to that subject : there was, in 

 consequence, all too little time for general collecting. Some of the largest 

 specimens, notably those of Pentaceros superbus, P. lincki, and P. gracilis, we 

 could never hope to have obtained in perfect condition with a dredge ; these 

 we owe to our divers, whom we instructed to bring up anything they could 

 find in addition to pearl and mother-of-pearl oysters. This is probably one 

 of the first expeditions in which a diver has been employed to make 

 zoological collections, and the success of the method, even more in other 

 groups than in Echinoderms, should commend it to others. 



My acknowledgments are due to Prof. F. Jeffrey Bell for his valuable 



opinion on certain species ; to Prof. J. Arthur Thomson, who kindly 



gave me accommodation in his laboratory at Marischal College, Aberdeen ; 



and to Dr W. S. Bruce, who was of great assistance to me in obtaining 



literature. 



ECHINOIDEA. 



The present collection contains fifteen species, none of which are new. 

 Dr Anderson, in 1882, collected six species, two of which, Temnopleurus 

 toreumaticus (Klein), Agass., and Arachnoides placenta (Linn.), Agass., are not 

 represented in this collection. The total number of species of Echinoids 

 known from the Mergui Archipelago is, therefore, seventeen. 



1 "Echinoidea of the Mergui Archipelago," by P. M. Duncan and W. P. Sladen, Jour. 

 Linn. Soc. London Zool., xxi. (1889), pp. 316-319. "Asteroidea," by W. P. Sladen, loc. cit., 

 pp. 319-331. 



