93 BuivivETiN 38 ' 123 



cylindreila Dall, Bull. M. C, Z., 9, p. 83, 1881; 18, p. 250, pi. 20, 

 f. 6, '89; Bull. 37, U. S. N. M., p. 138, pi. 20, f. 6. '89. 



Distribution. — Cape San Antonio, Yucatan Strait, 640 

 fms. 



Genus CERSTHIOPSSS Forbes and Hanley 



greenei C. B. Adams, Jour. Best. See. N. H., 2, p. 287, pi. 4, f. 

 12, 1839, (as CerWiiiiui); Dall, Bull. 37, U. S. N. M., p. 

 138, pi. 52, f. 2, '89; Tr. W. I. S., 3, p. 269, '92; Johnson, 

 Occ. Pa. Bost. Soc. N. H., 7, p. 126, 1915. 



Distribution. — Prince Edward Island to Dominican Repub- 

 lic and west of Cedar Keys, Fla., Corpus Cliristi and San 

 Antonio, Texas. 3-10 fms. Pliocene, Caloosahatchie River, 

 Florida. 



crystalllna Dall, Bull, M. C. Z., 9, p, 89, 1S81; 18, p. 254, pi. 20, 

 f. 3, '89; Bull. 37, U. S. N. M., p. 138, pi. 20, f. 20, f. 3, 

 '89; Dail and Simpson, Bull. U. S. Fish Com., i, p. 424, 

 1901. 



Distribution. — Washed ashore dead, Cedar Keys, Florida, 

 dredged alive west of Florida in 50 fms. Common in An- 

 tillean dredgings. 50-805 fms. 



martensi Dall, Bull. M. C. Z., 18, p. 255, pi. 20, f. 2, '89; Bull. 

 37, U. S. N. M,, p. 138, pi. 20, f. 2, '89. 



Distribution.^ — Gulf of Mexico, west of Florida, at 1181 

 fms. 



vanhynlngi Bartsch, Pr. Biol. Soc. Washington, 31, p. 135, 

 1918. 



Distribution. — Tampa Bay, West Fla. 

 burkevilSensis Dall, Pr. U. S. N. M., 46, p. 231, pi. 22, f. 5, 

 1914- 



Distribution. — Upper Miocene or Lower Pliocene, Burke- 

 ville, Texas. 



