MELVILL— MARINE MOLLUSCA. 121 



Order O P I S T H O E 11 A N C li I A T A. 



Suborder i. TECTIBRANCHIATA. 



Family ScapliaiidridaB. 



362. Aii/s [AliciiUt) vijllibdflca (llelb.). 



Loc. Seychelles : Station F 8, oi lathoiati, saud, shell, and weed yrouiul. 



Family BullidsB. 



363. Bulla australis, Quoy & Gaim. 



Loc. Amirantes : Station E 21, 30 fathoms, on Halimeda- and Lithothamiiia-vuhhlG,. 



Chagos Archipelago. 

 From the first-named station only young shells. 



Family Siplioiiariidse. 



36i. Siphonaria atra, Quoy. 

 Loc. Amirantes : S. Joseph I. 



Class PELECYPODA. 

 Order FILIBR ANCHI ATA. 



Suborder i. ARCACEA. 



Family Arcadse. 



365. Area imhricata, Brug. 



Var. mutabilis, Sovvb. 

 Loc. Seychelles : Praslin I. 



Chagos Archipelago : Salomon, Lagoon and Peros Banhos, Diamant, 16 fathoms. 



366. Area uavicularis, Brug. 



Loc. Saya de Malha Banks : Station C 15, 55 fathoms, on bank of loose Lithothamnia- 

 rubble. 

 Amirantes : Station E 2, 29 fathoms, similar ground. 



367. Area [Barbatia) deeussata, Sowb. 



Loc. Cargados Carajos : Station B 9, 30 fathoms, among broken coral. 



Amirantes : Stations E 13, 20-25 fathoms, rubble ; E 16, 39 fathoms, among 



Lithothamnia. 

 Chagos Archipelago : Salomon Lagoon and Peros Banhos, Diamant, 16 fathoms. 



SECOND SERIES. — ZOOLOGY, VOL. XIII. 16 



