88 PBECT SLADEN TEUST EXPEDITION. 



Family FossaridsB. 



77. Fossarus lamellosus, Montrouz. 

 Log. Amirantes : S. Joseph I. 



Seychelles : Praslin Island. 

 At both stations found attached to oysters. 



Family CerithiidsB. 



78. Cerithium amirantiuni, Sm. 



Cerithium amirantium, E. A. Smith, Rep. Voy. H.M.S. ' Alert/ p. 501, pi. 44-. fi-. R (1884). 

 IjOC. Amirantes : Station E 11, 25-80 fathoms ; hard rough ground. 

 One dead example, not in good condition, but seemingly agreeing in configuration 

 with this endemic species. In fresh state it is of a pink colour. 



79. Cerithium. citrinum, Sowb. 

 Log. Coetivy I. 



Chagos Archipelago. 



80. Cerithium columnu, Sowb. 

 Log. Seychelles : Praslin I. 



Chagos Archipelago. 



81. Cerithium echinatum, Lam. 

 Log. Seychelles : Praslin I. 



Coetivy I. 



Amirantes : Station E 18, 280 fathoms (one specimen) on Lithothamnia-ruhhle 



bottom. 

 Chagos Archipelago. 

 Seemingly a very abundant species, as are cUrinum, columna, fasciatum, koGhi, and 

 morus. 



82. Cerithium lacteum, Kien. 

 Log. Coetivy I. 



83. Cerithium morus. Lam. 

 Log. Amirantes : S. Joseph Atoll. 



In very poor worn condition, small or broken examples. This most common and 

 variable species possesses a long synonymic list, the principal variety being C. varie- 

 galwm, Quoy, rightly, we think, incorporated with moras, Lam., by Mr. Edgar Smith 

 (Rep. Zool. Coll. H.M.S. ' Alert,' p. 63). 



84. Cerithium jjetrosum (Wood). 



Log. Chagos Archipelago : Diego Garcia, Barachois Maurice. 



Seychelles : PrasUu I. 

 Closely allied to the last species (C. morus, Lam.), and incorporated with it by some 

 authors. This is probably C. tubereulatum, L. 



