69 MoivLUSCA OF THE GuLF OF MEXICO 37 



lignca Reeve, Conch. Icon., lo, Modiola, pi. lo, f. 71, '58 ; 



Ball, Bull. 37, U. S, N. M., p. 38, '89. 

 Modiolaria castanea Dall, Tr. W. I. S., 3, pt. 4, p. 266, '98. 

 Distribution. — S. Carolina to St. Thomas. West Fla. (Dall). 



Genus CRENELLA Brown 

 divaricata d'Orbign}- 



N'ltculocardia divaiicata d'Oxh., in De la Sagra, Hist. Pol. y 



Nat. Isla de Cuba, 2, p. 311, pi. 27, f. 56-59, 1847. 

 divaricata Gabb, Trans. Am. Phil. Soc, 15, p. 252, '73 ; 

 Dall, Bull. 37, U. S. N. M., p. 40, '89 ; T. W. I. S., 3, 

 pt. 4, p. 803, '98 ; Maury, Bull. 29, Am. Pal., p. 194, pi. 

 26, f. 18, 1917. 

 deatssata Dall, B. M. C. Z., 12, p. 235, '86. Not of Mon- 

 tagu. 

 Distribution. — Hatteras to Barbados. West Florida. Mio- 

 cene to Recent. 



Genus LITHOPHAGA Bolten 



bisulcata d'Orbigny 



Lithodomus bisulcatus d'Orb., Hist. Pol. y Nat. Isla de 



Cuba, 2, p. 333, pi. 28, f. 14-16, 1S47. (First, ed. 1845)- 

 Modiola appendiculata Philippi, Abb. u. Beschr. 2, p. 150, pi. 



I, f. I, 1846. 

 Lithodomus appendiculatus Reeve, Conch. Icon., 10, pi. 4, f. 



21, and biexcavatus Reeve, f. 22, a-b, '57. 

 Lithophagus bisulcatits'Ds.W, Bull. 37, U.S. N. M., p. 38,' 89. 

 Distribution. — S. Carolina to Rio de Janeiro. Upper Oligocene 



(of Tampa) to Recent. Living at Cedar Keys, Florida. 



aristata Dillwyn 



Mytiliis aristatus Dillwyn, Cat. Rec. Shells, i, p. 303, 1917. 

 Modiola caudigera Lamarck, An. s. Vert., 6, p. 116, 1819. 

 Lithodomus caudigerus ^itQ.\^, Conch. Icon., 10, pi. 3, f. 16, 



1857- 

 Lithophagus forficattts Ravenel, Proc. Acad. Nat. Sci. Phila. 



fori86i, p. 44; Dall, Bull. 37, U. S. N. M., p. 38. '89. 

 Lithophaga aristata DaW, Tr. W. I. S., 3, pt. 4, p. 800, '98 ; 



