62 



Family MYIDM, Gray. 



Penny Cycl. xiv, 1839. 



Genus MYA, Linn?eus. 



Westg. Res. 187, 1740. 



Laternula, Bolten. 



1. M. arenaria, Linn., Syst. Nat. 1112, 1767. 



M. acuta, Say, Jour. Acad. Nat. Sci. Philad. ii, 313, 1822. 

 31. mereenaria^ Say, Jour. Acad. Nat. Sci. Philad. ii, 313, 

 1822. N. Europe — United States. 



2. M. praecisa, Gould, Bost. Proc. iii, 215, 1850. 



Moll. Wilkes' Exped. 385, f. 498. Puget's Sound. 



3. M. truncata, Linn., Syst. Nat. 1112, 1767. 



M. ovalis, Turton, Conch. Dyth. 33, t. 3, f. 1, 2, 1822. 



JV. Europe — California. 



Genus PLATYODON, Conrad. 

 Jour. Acad. Nat. Sciences, vii, 235, 1837. 



1. P. cancellata, Conrad, Jour. Philad. Acad, vii, 235, 1837. 



California. 



Genus TTTGONIA, Gray. 

 Syn. Brit. Mus. 91, 1842. 



1. T. anatina {Mya\ Gmel., Syst. Nat. 3221, 1790. 

 Anatina globulosa, Lamarck, Anim. s. Vert, v, 464, 1818. 



Reeve, Monog. sp. 1, 1863. W. coast Africa. 



2. T. compressa, Reeve, Monog. sp. 3, 1863. West Africa. 



3. T. divaricata, Reeve, Monog. sp. 2, 1863. Ceylon. 



4. T. uobilis, A. Adams, Reeve Monog. sp. 5, 1863. 



W. Africa. 



6. T. semisulcata, A. Adams, Reeve, Monog. sp. 4, 1863. 



W. Africa. 



6. T. siphonata, Reeve, Monog. sp. 6, 1863. W. Africa. 



