CONCEIFERA. 
127 
Fam. Aviculidce. 
Pinna, Linn. 
*P. perimla, Chemnitz.— I obtained only one specimen of this 
large shell, which had been washed ashore on the beach at Lemon 
Valley. It did not contain an occupant. 
Avicula, Lam. 
* A. hirundo, Linn.— This shell, which is known on the English 
and the Mediterranean coasts, is also found on the sea-beach at St. 
Helena. 
Fam. Mytilidrs. 
Mytilus, Linn. 
*M. edulis, Linn. — The Mussel, which is common on the English 
and Mediterranean coasts, is found alive adhering to the long pieces 
of seaweed which drift on shore at Sandy Bay beach. 
*M. crenatus, Lam. — A yellowish-brown bivalve, found with 
the other species on the floating seaweed. 
Lithodomus, Cuv. 
"L. lithophagus, Linn. — This perforator or stone-borer is to be 
found embedded in its holes in the specimens of Lithotliamnion, which 
are washed up on the sea-beach at Lot’s Wife Ponds and other places 
on the Windward Coast. 
Fam. Arcidce. 
Area, Linn. 
*A. domingensis, Lam. — A whitish shell, about half an inch 
in length, found in the pools on the sea-shore, and in such a condi- 
tion as to warrant the belief that it exists there in a living state. 
Fam. lucmida;. 
Lucina, Bruguiere. 
*li. n _ S p — A flat white shell, about half an inch in diameter, 
found under the same circumstances as the last, and in good 
preservation. 
Fam. Chatnida. 
Cliama, Linn. 
*C. gryplioides, Linn. 
