57 MOLLUSCA OF THE GULF OF MEXICO 25 



/undatjYLo\vo.Q:s, Idem, p. 11, pi. 2, fig. lo. 

 virginica Dall, Bull. Bull. 37, U. S. Nat. Mus. , p. 32, i! 

 Trans. Wagner Inst. Sci., vol. 3, pt. 4, p. 687, 1898 ; 

 Clark, Pleistocene of Maryland, Md. Geol. Surv., p. 204, 

 pis. 41, 42, 43, IQO6. 

 Distribution. — Canada to Mexico and Gulf of California. Mio- 

 cene to Recent. 

 Gulf coast. — Recent : Cedar Keys, St. Mark's, Ft. Barranca, 

 Fla. ; Belle Isle, Point au Fer, Week's Island, Lake 

 Charles, La. ; Port Lavaca, Rockport and Corpus Christi, 

 Texas. 

 Pleistocene : Grand Chenier ; New Orleans pumping station 

 No. 7 ; New Orleans Gymnasium well at 1200 feet ; 

 Knapp's wells in Terrebonne Parish, No. i at 1600-1700, 

 No. 2atn90-i430, 1434-1519, 1532-1632, 1780-1790, 1791-1842, 

 No. 3 at 570, 700-780, 880-900, 1040-1043, n50-i20o, 1330- 

 1375, 1400-1440, 1443-1470, 1470-1480, 1500-1525, 1579-1618, 

 1700, 1800 (Oyster bed); Bayou City well, Beaumont, 

 Texas at 600 feet ; Weiss No. j , depth not recorded ; 

 Petroleum and Liquid Fuel Co.'s well No. i, Beaumont, 

 at 705 feet. Orient and West Creek, Fla. Pliocene : 

 Caloosahatchie marl, Fla. 

 cristata Born 



cristata Born, Mus. Vind., p. 112, pi. 7, fig. 3, 1780. 

 cristata Dall, Bull. 37, U. S. Nat. Mus., p. 32, 1889 ; Dall 

 and Simpson, Bull. U. S. Fish Comm., vol. i, p. 464, 

 1901. 

 Distribution. — Florida to Martinique. Gulf coast, Tampa. 

 frons Linnaeus 



Mytilus frons Linnaeus, Syst. Nat., ed. X, p. 704, 1758. 

 frons 'SiOv^Qxhy , Conch. Icon., vol. 18, pi. 19, fig. 41, 1871 ; 

 Dall, Bull. 37, U. S. Nat. Mus., p. 32, 1889 ; Dall and 

 Simpson, Bull. U. S: Fish Comm., vol. i, p. 464, 1901. 

 Distribution. — East and west coasts Florida to Barbados. 

 equestris Say 



equestris Say, See Tryon, Amer. Marine Conch., p. 193, 

 1873-1874; Dall Bull. 37, U. S. Nat. Mus., p. 32, 1889; 



