6 9 



MOIXUSCA OF THE GlLF OF MEXICO 



37 



lignea Reeve, Conch. Icon., 10, Modiola, pi. 10, f. 71, '58 ; 



Dall, 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 CREMELLA Brown 

 divaricata d'Orbigny 



Nuculocardia divaricata d'Orb., 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. 



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

 tagu. 



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

 cene to Recent. 



Genus L!TH9PHAG$ Bolten 

 bisulcata d'Orbigny 



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

 Cuba, 2, p. 333, pi. 28, f. 14-16, 1847. (First, ed. 1845)- 

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

 1, f. 1, 1846. 



Lithodomus appe?idiculatus Reeve, Conch. Icon., 10, pi. 4, f. 



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

 Lithophagus bisulcatus Dall, 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 



Mytilus aristatus Dillwyn, Cat. Rec. Shells, 1, p. 303, 1 917 . 

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

 LMhodomus caudigerits Reeve, Conch. Icon., 10, pi. 3, f. 16, 

 1857. 



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



fon86i, p. 44; Dall, Bull. 37, U. S. N. M., p. 38. '89. 

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



