PELECYPODA. 63 



Cryptodon insignis Verrill and Bush, Proc. U. S. Nat. Mus., 

 1898, vol. 20, p. 785, pi. 91, figs. 1, 2. " between N. lat. 44° 54', 

 W. LONG. 59° 46' 45", and N. lat. 42° 19', W. long. 69° 47^', in 

 65 TO 471 fathoms." 



Mass. — Off Cape Cod, N. lat. 42° 19', W. long. 69° 47', north- 

 ward in 65 to 471 fathoms. 



*Thyasira gouldii (Philippi). 



Dall, Proc. U. S. Nat. Mus., 1901, vol. 23, p. 786. 

 Lucina fiexuosa Gould, Inv. Mass., 1841, p. 71, fig. 52 {non 

 Montagu, 1813). [Massachusetts Bay.] 



Lucina gouldii Philippi, Zeitsch. fiir Malak., 1845, p. 75. 

 Cryptodon gouldii Gould, Inv. Mass., 1870, p. 100, fig. 406. 



Me. — Casco Bay; Frenchman's Bay, 20 to 40 fathoms; East- 

 port. 



Mass. — Massachusetts Bay; Wiscasset; Buzzards Bay, 6 

 fathoms ; Duxbury . 



R. I.— Off Block Island, 29 fathoms. 



Conn. — Stonington. 



Thyasira trisinuata (d'Orbigny). 



Dall, Proc. U. S. Nat. Mus., 1901, vol. 23, p. 786. 



Lucina trisinuata d'Orbigny, Moll. Cubana, Spanish ed., 1846, 

 vol. 2, p. 300, pi. 27, figs. 46^9. [Cuba.] 



Cryptodon ohesus Verrill, Amer. Journ. Sci., 1872, ser. 3, vol. 3, 

 p. 287, pi. 7, fig. 2. 



Me. — Casco Bay; Wiscasset. 



Mass. — Massachusetts Bay; off Marthas Vineyard, 19 fathoms. 



R. I.— Off Block Island, 29 fathoms. 



Thyasira plana (Verrill and Bush). 



Dall, Proc. U. S. Nat. Mus., 1901, vol. 23, p. 786. 

 Cryptodon planus Verrill and Bush, Proc. U. S. Nat. Mus., 1898, 

 vol. 20, p. 788, pi. 88, figs. 3, 4. " north of Cape Cod," etc. 



