93 BuivLETiN 38 T23 



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 CERlTl-SiOPS 1 S Forbes and Hanley 



greenei C. B. Adams, Jour. Bost. Soc. N. H., 2, p. 287, pi. 4, f. 

 12, 1839, (as Cerithium)] 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 Christi and San 

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

 Florida. 



crystaJIina Dall, Bull, M. C. Z., 9, p, 89, 1881; 18, p. 254, pi. 20, 

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

 '89; Dall 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. 



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

 1918. 



Distribution. — Tampa Bay, West Fla. 



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

 1914. 



Di stribution. — Upper Miocene or Lower Pliocene, Burke- 

 ville, Texas. 



