OF MERGUI AND ITS ARCIIIPELAGO. 



173 



Dlue. Eixed on shells, stones, &c. ; encrusting the rocks below 

 nigh- and low-water levels. 



Elphinstone Island Bay, and on sand below mangrove-trees. 

 Widely distributed in the Indian seas. Red Sea, Mozambique, 

 Ceylon, Siam, Sumatra, Timor, Moluccas, Philippines. 



01. st re a mttiloides, Lam., Humph. Amboin. Rariteit- 

 Kamer, pi. 46. fig. O ; Reeve, Conch. Icon, xviii. pi. ii. fig. 3. 



Of oblong flat shape. Ordinarily fixed on wood. 



Elphinstone Island Bay, on stems of mangrove-trees. Ceylon, 

 Moluccas. 



62. Ostrea negromarginata, Sowerby, Reeve, I. c. xviii. pi. 33. 

 fig. 85. 



Very flat and thin, inside white in the centre, dark violet 

 at the periphery. 



Elphinstone Island Bay, on the trunks of mangrove-trees. 

 AraJcan. 



63. Ostrea echinata, Quoy and Gaimard, Voy. 'Astrolabe, 

 Zool. iii. p. 155, pi. 76. figs. 13, 14. 



Ostrea spinosa (by mistake from the French name " epineuse" in the 

 volume cited above), Reeve, Conch. Icon, xviii. pi. xxx. fig. 79. 



Small, rather flat, beset with blunt blackish spines. 



Elphinstone Island Bay, with the preceding on mangrove- 

 trunks. Amboina. 



64. Ostrea (Alectryoeta) folium, L., Rumph. Amboinsche 

 Rariteit-Kamer, pi. 47. fig. A ; Chemnitz, Conch.-Cab. vol. viii. 

 figs. 662-666 ; Lamarck, Hist. Nat. Anim. s. Vert. ed. 2, vii. p. 232 ; 

 Reeve, Conch. Icon, xviii. pi. xviii. fig. 40. 



Elongated, sharply plaited, yellowish brown or reddish ; one 

 valve fixed by peculiar brackets to mangrove-branches. 

 King Island Bay. Moluccas. 



LlJCINIM. 



65. Lucina (Anodontia) edentula, L. (Venus), Rhilippi, 

 Zeitschr. f. Malak. 1845, p. 180 ; Abbildungen, vol. ii. Lucina, 

 pi. 1. fig. 1. 



? Lucina Philippiana, Reeve, Conch. Icon. vol. vi. pi. v. fig. 23 (not good). 

 Shell thin, convex, rounded before and behind, with unequal 

 strong lines of growth ; in fresh state covered with a distinct 

 pale grey-brown periostracum ; hinge-line rather thin. No 

 distinct impression at the hinder area. 



15* 



