Pleistocene Snails from San Patricio County, Texas 



49 



Succinea grosvenori Lea 

 PI. 1, fig. 11. 



Description. Specimens are in essential agreement with those of Pilsbry 

 (1948, pp. 820-822) and Leonard (1950, p. 24). 



Measurements. Measurements for Succinea grosvenori are given in Table 21. 



Distribution. "It [Succinea grosvenori] occurs from the warm humid Golf 

 Coast to semi-arid areas in the great plains and mountain states, and in British 

 America it extends north within the border of Northwest Territory" (Pilsbry, 

 1948, p. 821). 



Ecology. "S. grosvenori, as now understood, tolerates an astonishingly wide 

 range in practically all external conditions." (Pilsbry, 1948, p. 821.) 



Remarks. Leonard ( 1950, p. 24) records Succinea grosvenori from the Afton- 

 ian of the Panhandle of Texas; the overall geologic range of the species was given 

 as Aftonian to Recent. 



Specific determination of this species was made by Dr. J. P. E. Morrison. 



Table 21. Measurements of Succinea grosvenori in mm. 



Section 

 and bed 

 Specimen nos. 



48 



49 



50 



51, PI. 1, fig. 11 



Length Diam. 



Apert. 

 height 



Apert. 

 width 



No. of 

 whorls 



2,7 



12.0 



6.0 



6.2 



5.0 



3% 



2,7 



10.2 



5.8 



6.0 



4.2 



3'/ 2 



2,6 



10.1 



5.3 



5.8 



4.1 



3V4 



2,6 



12.9 



6.9 



8.0 



5.8 



334 



Land Snail Egg 











PI. 1, 



fig. 14. 











Description. Egg nearly spherical; calcified wall, hollow interior; color is 

 buff; average diameter of three specimens is 4.5 mm. 



Remarks. We were not able to identify the eggs further. 



Scleria? sp. 

 PI. 1, figs. 13a-c. 



Description. No description of this seed is attempted at this time; maximum 

 diameter of seed is 4.5 mm, and minimum diameter is 4.0 mm. 



Remarks. We are indebted to Mr. Bob Gunn of the Department of Botany, 

 Iowa State University, Ames, Iowa, for a tentative identification of this fossil seed 

 of the sedge genus Scleria? Sedge are in themselves indicative of most ecological 

 stations. 



Literature Cited 



Baker, F. C. 1939. Fieldbook of Illinois land snails. Illinois Nat. Hist. Surv., 

 Manual 2, 116 pp. Urbana. 



Browne, R. G. and D. E. McDonald. 1960. Wisconsinan molluscan faunas from 

 Jefferson County, Kentucky. Bull. American Paleont. 41: 165-183. 



