6 1 Bulletin 38 • 91 



beaumontefisis Aldrich, Bull. No. i, Univ. Texas, July, 1901; 

 Nautilus, p. 74 and figs., Nov. 1901, (as Nassa). 



Distribution. — Pleistocene. Spindle Top Hill oil well, near 

 Beaumont, Texas, at 390 feet. 



Genus STROMBSl^A Moerch 



gibberuia var. galvestonensis Harris, Bull. Am. Pal,, vol. i, p. 

 103, pi. 4, f. 6, 1895. 



Distribution. — Upper Miocene, Galveston well at 2410-287 1 

 feet. 



Note — The tA^pical form of gibberuia Sowerby, (Pr. Zool, 

 Soc, p. 115, 1832), is recent on the Pacific coast of Central 

 America southward to Paiti, Peru. 



Genus A!\IACHIS H. and A. Adams 



avara Say, Jour. A. N. S. Phila., 2, p. 230, 1882, (as Coluvibella); 

 Tuomey and Holmes, PI. Fos. S. C. p. 139, pi. 28, f. 12, 

 1857; Dall, Bull. 37, U. S. N. M.,p. 116, pi. 50, f. 12, '89; 

 Vanatta, Pr. A. N. S. Phila., 55, p. 757, 1903; Johnson, 

 Occ. Pa. Bost. Soc. N. H., p. 132, 1915. 



Distribution. — Recent and Pleistocene. Massachussetts to 

 Florida Keys. Gulf coast: Crooked Isl., West Fla. , and 

 Texas. Pleistocene, Uake Borgne borings. La. , and North 

 Creek, West Fla. 



avara var. semiplicata Stearns, Pr. A. N. S. Phila., p. 344, 

 1873, (as Columbella); Tryon, Man., 5, p. 159, pi. 55, f. 70, 

 71, '83; Dall, Bull. 37, U. S. N. M., p. 116, '89. 



Distribution. — Cedar Keys and Charlotte Harbor, West Fla. ; 

 Ivouisiana; Corpus Christi, Texas. 



avara var. similis Ravenel, Pr. A. N. S. Phila., p. 41, 1861, (as 

 Columbella; Tryon, Man., 5, p. 159, pi. 55, f. 69, '83; Dall, 

 Bull. 37, p. 116. '89. 



