Pleistocene Snails from San Patricio County, Texas 41 



Gastrocopta contractu (Say) 

 PI. 1, figs. lOa-c. 



Description. Description and measurements by Franzen and Leonard (1947, 

 pp. 330, 331 ) fit our specimens. Shell is white with no trace of the original color 

 preserved. 



Measurements. Measurements for Gustrocopta contructu are given in Table 6. 



Distribution. In Canada, Ontario and Manitoba; in the United States, from 

 Maine to Florida, west to South Dakota, Kansas, Oklahoma, and to the mouth of 

 the Pecos River in Texas; in Mexico, to Veracruz (Franzen and Leonard, 1947, 

 p. 331). 



Ecology. "On shaded slopes along the watercourses, under dead wood, leaf 

 mold and grass" (Franzen and Leonard, 1947, p. 331). 



Remarks. Gastrocopta contractu is herein reported for the first time as a fossil 

 from Texas. 



Table 6. Measurements of Gastrocopta contracta in mm. 



Section 



and bed Apert. Apert. No. of 



Specimen nos. Length Diana. height width whorls 



60, PI. 1, figs. lOa-c 2, 5 2.7 1.5 1.0 0.8 534 



61 2,5 2.7 1.4 0.9 0.7 5% 



62 2,5 2.3 1.2 1.0 0.9 5i/ 2 



63 2,5 2.2 1.3 0.9 0.8 534 



Gastrocoptu cristata (Pilsbry and Vanatta) 

 PI. 1, figs. 7a-c. 



Description. Shells striate; specimens similar to those described by Franzen 

 and Leonard (1947, p. 345) from the Recent and Pleistocene except our forms are 

 smaller than Franzen and Leonard's Pleistocene examples in regard to height, 

 width, and apertural height and width. Compare measurements of Gastrocopta 

 cristata in Table 7 with measurements of the forms given by Franzen and Leonard 

 (1947, p. 345) from Meade County, Kansas: height, 2.35-3.5 mm; diameter, 

 1.35-1.40 mm; apertural height, 1.1-1.2 mm; apertural width, 0.7-1.0 mm. Speci- 

 mens are pale yellow as a result of weathering. 



Measurements. See Table 7 for measurements of Gastrocopta cristata. 



Distribution. Pilsbry (1916, p. 68) gave the distribution of Gastrocopta cris- 

 tata as northern Kansas, south to Oklahoma and southern Texas; west to New 

 Mexico and Arizona. 



Table 7. Measurements of Gastrocopta cristata in mm. 



Section 



and bed Apert. 



Specimen nos. Length Diam. height 



56 2,5 2.7 1.3 0.8 



57 2,5 3.0 1.2 0.9 



58 2,5 2.3 1.2 0.8 



59, PI. 1, figs. 7a-c 2, 5 2.7 1.2 0.9 



Apert. 

 width 



No. of 



whorls 



0.7 



53/ 4 



0.8 



6 



0.7 



5]/ 2 



0.8 



5?4 



