1912^ Distribution of Bivalves of Beaufort, K. C. 79 



Living animals are occasionally found. Systematic search 

 would probably reveal a moderate number. It is found attached 

 to suitable objects in the water. 



FAMILY OSTREID^. 



Genus Ostrea (Linnaeus) Lamarck. 



Ostrea virginica Gmelin. 



Ostrea virginica Gmelin, Syst. Nat., p. 3336, 1792; Dall, Trans. Wagner 

 Inst. Sci., vol. 3, pt, 4, p. 687, 1898. 



This abundant species needs only inclusion in this list. 



FAMILY PECTINIDiS: 

 Genus Pecten Miiller. 



Pecten (Plagioctenium) gibbus (Linnaeus). 



Ostrea gibba Linnaeus, Syst. Nat., Ed. 10, No. 172, p. 698, 1758. 

 Pecten dislocatus Say, Journ. Acad. Nat. Sci. Phila., vol. 2, p. 260, 1822. 

 Pecten (Plagioctenium) gibbus, Dall, Trans. Wagner Inst. Sci., vol. 3, 

 pt. 4, p. 745, 1898. 



This species is found in sufficient quantities to form a local 

 food supply of considerable value. The adult form is free- 

 swimming and may be found at various times in different local- 

 ities. Some observations on the habits of the varietal form 

 Pecten dislocatus Say have been published by Grave, B. H., 

 Biol. Bull., vol. 16, No. 5, April, 1909. 



FAMILY ANOMIIDiE. 



Genus Anomia (Linnaeus) Miiller. 



Anomia simplex Orbigny. 



Anomia simplex Orbigny, Moll. Cubana, vol. 2, p. 367, pi. 38, figs. 31-33, 

 (1845 Spanish edition), 1853; Dall, Bull. 37, U. S. Nat. Mus., p. 32, pi. 53, 

 figs. 1-2, 1889; Dall, Trans. Wagner Inst. Sci., vol. 3, pt. 4, p. 784, 1898. 



The animal is common in the vicinity. One collecting 

 ground is the shoals west of the laboratory. It is found attached 

 to other shells, as Ostrea, Tagelus, Macrocallista. 



