14 



1'2. Laganum depressum, Less. 

 A. Ag., Rev. Ech., p. 518. 



Localities.— Ylll; 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.— XXXIL, 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 ; 



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



shell ; and XLI., 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 Clypeaster 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. IJedford as Laganum sp., from Singapore and Malacca {P.Z.S. 

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

 of L. depressum. 



15. Lovenia subcarinata, Gray. 

 A. Ag., Rev. Ech., p. 377. 



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



