26 Proceedings of the Eoyal Physical Society. 



12. Laganum depressum, Less. 

 A. Ag., Eev. Ech., p. 518. 



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

 XXXII., Bentinck Island, 29 fathoms, soft mud. 



The edges of the larger specimens have decided re-entrant angles, 

 especially posteriorly. A young specimen (22 - 5 mm. long) has the angular 

 outline of the adult, but the edges are straight. 



Known from Zanzibar and Mozambique to the Philippines and Australia ; 

 and collected by Dr Anderson at King Island, Mergui Archipelago. 



13. Laganum decagonale, de Blainv. 



Peronella decagonalis, A. Ag., Rev. Ech., p. 520. 



Localities. — XXXII., Bentinck Island, 29 fathoms, soft mud; XIII,, Maria 



Island, shore pools ; XVIII., Off Paway Island, 10 to 21 fathoms, sand 



and shell ; XXV., Gregory Group, 4 to 14 fathoms, sand and shell ; 



XXIL, Hastings Harbour, St Luke's Island, 15 to 20 fathoms, sand and 



shell ; and XLL, Moskos Islands, 12 to 15 fathoms, sand and rock. 



The largest specimen has a longitudinal diameter of 108 mm. 



The youngest specimens have an almost circular outline with a bare 



suggestion of the angles. A young denuded test (31 mm. diameter) from 



Hastings Harbour recalls Clyjyeaster humilis, but, I think, is referable to this 



species. 



Distributed in the Bay of Bengal and the Western Pacific. Also recorded 

 from Mozambique. 



14. Laganum sp. 



Locality. — XVIII, Off Paway Island, 10 to 21 fathoms, sand and shell. 



Five small dead and denuded tests were found in the dredge; the largest 

 has a longitudinal diameter of 17 mm. The test is orbicular and somewhat 

 swollen ; there are four genital pores. 



These specimens seem to be identical with those described and figured 

 by F. P. Bedford as Laganum sp., from Singapore and Malacca {P.Z.S. 

 (1900), p. 285, pi. xxiii. fig. 7, a and b). They may or may not be the young 

 of Ij. depressum. 



15. Lovenia subcarinata, Gray. 

 A. Ag., Rev. Ech., p. 577. 



Locality. — I., Tavoy Island, 10 fathoms, sand and shell. 



