9 Buivi^KTiN 38 39 



Distribution. — East and West Atlantic. A deep, water 

 species of wide range. Gulf of Mexico: Yucatan Strait, 

 640 fms. 



(Sathoxiphus) didymum Watson, Jour. Linn. Soc. London, 14, p. 

 517, 1879; Henderson, Bull. 1 1 1 , U. S. N. M. , p. 83, pi. 14, 

 f. 10, 1920. 



Distribution. --Culebra Isl. and Barbabos. Doubtful specimen, 

 Yucatan Banks, 25 fms. 



(Compressidens) pressum Pilsbry and Sharp, Tryon's Man. Conch. 

 17, p. 124, pi. 7, f. II; pi. 22, f. 50-52, 1897; Henderson, 

 Bull, III, U. S. N. M., p. 83, pi. 14, f. 3, 6, 8, 1920. 



co?npressu7nVJsit'6on, Jour. Linn. Soc. London, 14, p. 516, 1879; 

 Dall, Bull. M. C. Z., 9, p. 38, 1881; Watson, Chall. Rept. 

 (Scaph.), p. 9, pi. I, f. 9, 1885; Dall, Bull. 37, U.S. N. M., 

 p. 76, 1889. Not compressu77i of d'Orbigny, 1850. 



Distribution. — Florida to the Antilles. Gulf of Mexico: 

 Off Cedar Keys, 196 fms.; between Mississippi delta and 

 Cedar Kej^s, Fla. 



(Compressidens) ophiodon Dall, Bull. M. C. Z., 9, p. 38, 1881; 18, 

 p, 427, pi. 26, f. 9, 1889; Bull. 37, U. S. N. M., p. 76, pi. 

 26, f. 9, 1889 ; Henderson, Bull, iii, U. S. N. M., 84, pi. 

 14, f. 2, 1920. 



Distribution. — Florida to Barbados. Gulf of Mexico: West 

 Florida, 169 fms. 



quadrangulare Harris, Bull. Amer. Paleontology, vol. i, p. 95, 

 1895. Upper Miocene, Galveston well at 2465-2871 feet 

 (Harris). 



tetragonum Sowerby, Thesaurus Conch., 3, p. 103, pi. 224, f. 

 21, 22, i860. Upper Miocene, Galveston well, at 2158- 

 2920 feet (Harris). 



Remark.— A fragment of an undetermined. Pleistocene, Den- 

 talium was obtained from Knapp's No. 2 well, Terrebonne 

 Parish, La. at 1 190-1430 feet. 



