68 MOLIvUSCA OF THE GULF OF MEXICO 38 



Distribution. — Gulf of Mexico between Mississippi delta 

 and Cedar Keys. Also Florida Strait. 533-940 fms. 



agassizi Verrill and Smith, Am. Jour. Sci., 22, p. p. 394, 1880; 

 Tr. Conn. Acad., 5, p. 454, pi. 57, f. 3, 3 a, '82. 



Distribution.— Rhode Island to Cape Fear, N. C. The 

 variety mcxicana Dall (Bull. 37, U. S. N. M., p. 104, pi. ir, 

 f. 14, 1889) ranges from Western Florida and Yucatan re- 

 gions of the Gulf to Martinique. 502-640 fms. 



filifera Dall. Bull. M. C. Z., 9, p. 56, iSSi, (as Bela); 18, p. 123, 

 pi. 12, f. 9, '89; Bull. 37, p. 104, p. 12, f. 9, '89. 



Distribution. — Gulf of Mexico, West of Florida, 331 fms. 



hadria Dall, Bull. M. C. Z., 18, p. 125, 1889; Bull. 37, p. 104, 

 18S9. 



Distribution. — Cape Fear, N. C, 407 fms. Also Gulf of 

 Mexico between Mississippi delta and Cedar Keys, at ir8i 

 fms. 



extensa Dall, Bull. M. C. Z., 9, p. 55, Aug., 1S81, (as var. of 

 Pleiuotoma blakeana)\ 18, p. 126, pi. 10, f. 2, '89; Bull. 37, 

 p. 104, pi. 10, f. 2, '89. 



Pleurotoma sfreptopliora Watson, Jour. Linn. vSoc, 15, p. 464, 

 Nov. 1881; Chall. Gastr., p. 366, pi. 19, f. 8 a-b, 1885. 



Distribution.— Gulf of Mexico, Lat. 23° N., Don. 88° W., 

 S04 fms.; Yucatan Strait 640 fms. Also North Atlantic. 



blakeana Dall, Bull, M. C. Z., 9, p. 54, 1881; 18, p. 126, pi. 10, 

 f. I, '89; Bull. 37, p. 104, pi. 10, f. I, '89. 



hrevis Verrill, Tr. Conn. Acad., 6, p. 417, pi. 44, f. 8, '85. 



Distribution. — Gulf of Maine to Santa Cruz, W. I., 100-1608 

 fms. Also Yucatan Strait, 640 fms.; Florida Strait, 339 

 fms. 



