64 MOLLUSCA OF THE GlJXF OF MEXICO 34 



Genus DRILLIA Gray 



ostrearum Stearns, Pr. Bost. Soc. N. H., 15, p. 22, 1872; Tr3-on, 

 Man. 7, p. 197, pi. 34, f. 79, '84; Dall, Bull. 37, U. S. N. 

 M., p. 96, '89; Dall & Simpson, Bull. U. S. Fish Com., i, 

 p. 385, 1901. 



Distribution. — Hatteras to Cape Catouche, Yucatan and An- 

 tilles. 15-170 fms. West Florida: Recent, Cedar Keys; 

 Upper Oligocene, Tampa; Lower Miocene, Chipola beds; 

 Pliocene, Caloosahatchie beds. 



albicoma Dall, Bull. M. C. Z. 18, p. 83, pi. 10, f. 8, '89; Bull. 

 U. S. N. M., 37, p. 96, pi. ID, f. 8, 1889. 



Distribution.— Gulf of Mexico, Lat. 23° N., Lon. 89° W., 

 84 fms. Also off Barbados, and St. Thomas. 



detecta Dall, Bull. M. C. Z., 9, p. 65, Aug., 1881: 18, p. 84, pi. 

 12, f.ii. 1889; Bull. 37, p. 96, pi. 12, f. II, '89. 



ciraimvoluta Watson, Jour. Linn. Soc, 15, p. 465, Nov. 1881; 

 Rept. Chall. Gastr., p. 357, pi. 21, f. i, 1885. 



Distribution. — Gulf of Mexico, 339 fms. Also Culebra 

 Isi, W. I. 



alesidota var. macilenta Dall, Bull. M. C. Z., 18, p. 85, pi. 36, f. 

 I, 1889; Bull. 37, U. S. N. M., p. 96, pi. 36, f. I, '89. 



Distribution. — Cape Fear, N. C. to Barbados. Gulf of 

 Mexico between Mississippi delta and Cedar Keys, iii fms. 

 Tj'pical form of species, off Hatteras. 



eucosmia var. canna Dall, Bull, M. C. Z., 18, p, 86, 1889; Bull. 

 37, U. S. N. M., p. 96, '89. 



Distribution. — Cape Lookout, N. C, to Grenada, W. I. 

 Also Gulf of Mexico, west of Florida, 50 fms. 



leucomya Dall, Proc, U. S. N. M., 6, p. 328, pi. 10, f. 8, 1883; 

 Bull. 37, p. 96, pi. 48, f. 7, 1889; Tr. W. Inst., 3, p. 36, 

 1890. 



