ACTINOGONIDIATE ECHINODERMS. 231 



XXV, Genus Astropyga. 



Immature forms, N. Male, 25/, coral masses, Polytrema, etc., and Mulaku, 30_/!, green and 

 dead weed, also from Minikoi lagoon, Q f. 



XXVI. Genus Asthenosoma. 



40. Asthenosoma urens. 



Cyanosoma urens, Sarasins, Zool. Anzeig. IX. (1886), p. 80. 



Asthenosoma urens, iid. Ergeh. Forschungen avf Ceylon, i. (1888), p. 86. 



A large number of specimens, Mulaku, 27 /., mud and sponges, also Haddumati, 40 /., mud 

 and weed, and Suvadiva, 43/., soft mud. 



XXVII. Genus Temnopleurus. 



Immature forms in 5 dredgings, 22 — 25/, sand, weed and generally rubble. 



41. Temnopleurus toreumaticus. 



Cidaris toreumatica, Leske, Addit. ad hist. p. 155. 



Temnopleurus toreumaticus, Agass. m Valentin's Avat. du gejire Echinus (1841), p. viii ; 

 Bell, P.Z.S. 1880, p. 428. 



Mulaku, 28 /., and Haddumati, 40 /., mud and weed. 



XXVIII. Genus Salmacis. 



42. Salmacis hicolor. 



Salmacis hicolor, Agass. op. cit. p. viii. ; Al. Ag. Rev. Ech. (1872), p. 156. 



Suvadiva, 30 /"., hard sand (?), and Haddumati, 32 and 40 /., dead coral masses, mud and 

 weed. The Suvadiva specimen had associated with it a similarly coloured Gastropod, which 

 was resting in an especial clearing among its spines. 



XXIX. Genus Tripneustes. 



43. Tripneustes angulosa. 



Cidaris angulosa, Leske, Addit. (1788), p. 92. 



Tripneustes angulosa. Bell, P.Z.S. (1879), p. 657. 



Occasionally found at Minikoi and the Maldives on the sand-flats, not uncommonly cast 

 up on the lagoon beaches. 



XXX. Genus Echinometra. 



44. Echinometra lucunter. 



Echinus lucunter, Linn. Syst. Nat. ed. X. (1758), p. 665. 



Echinometra lucunter, De Blainv. Actin. (1834), p. 225; Lov^n, Bih. Sv. Vet. Akad. Hdlgr. 

 13, IV. no. 5 (1887), p. 153. 



Wedged into hollows in the extreme seaward edges of all reefs, almost where the rollers 

 break. The animal varies rather in colour, the lighter forms occurring further out. 



G. 30 



