59 Bulletin 38 89 



Distribution. — Arrowsmith Bank, Yucatan, 130 fms. Also 

 Antillean. 



bushi Dall, Bull. M. C. Z., 18, p. 182, pi. 15, f. 12, 1889. 



Distribution.— Gulf of Mexico, Blake station 5, 152-229 fms. 

 Also off Sand Key, Fla. and Barbados. 



Genus ALECTRiO!^ Montfort 

 vibex Say, Jour. A. N. S. Phila., (i), 2, p. 231, 1822, (asNassa); 

 Am. Conch., pi. 57, f. 2; Dall, Bull. 37, U. S. N. M., p. 

 116, pi. 50, f, 8, 1889; Singley, 4tli Ann. Rept. Tex. G. S., 

 P- 335' 1892; Johnson, Occ. Pa. Bost. Soc. N. H.,7, p. 134, 

 1915. 



/retensi's Fer'kms, Pr. Bost. Soc, 13, p. 117, 1869. 



Distribution. — Cape Cod to Colon. Gulf coast: Cedar 

 Keys and St. Mark's, Fla., Point au Fer, I^a., Galveston, 

 Corpus Christi, Tex. Pleistocene, New Orleans pumping 

 station No. 7; Manatee, Orient and Labelle, West Fla. 

 Pliocene, Caloosahatchie. 

 ambiguus Montagu, Test. Brit., pi. 9, f. 7, 1803, (as Buccimcm) ; 

 Dall, Bull. M. C. Z., 18, p. 184, '89; Not amhigua Dunker 

 (West African), which \s iiicrassata Strom. 

 alba Say, \%2.6\ ca7ididissima C.B.Adams, Krebs Cat., p. 32. 



Distribution. — North Carolina to West Florida and Barbados. 

 Yucatan Strait, 640 fms. Variety antillarum d'Orb., Ca- 

 loosahatchie Pliocene. 



acutus Say, Jour. A. N. S. Phila., 2. p. 234, 1822, Nassa); 

 Holmes, Post-Pl. Fos. S. C, p. 72, pi. 12, f. 3, 1860, (as 

 Bucdmmi); Hilgard, House of Rep. Ex. Doc. i, pt. 2, p. 

 886, '78; Dall, Bull. 37, U. S. N. M., p. 116, '89; Harris, 

 Bull. Am. Pal., vol. i, p. 102, '95; Vanatta, Pr. A. N. S. 

 Phila., 55, p. 757, 1903; Deussen, Water Supply Pa. 335, p. 

 77, 1914. 



Distribution. —Carolinas to Barbados. Gulf coast: Recent, 

 St. Joseph's Bay and Crooked Isl., West Fla.;Point au Fer, 



