1906.] NATURAL SCIENCES OF PHILADELPHIA. 161 



Succinea grosvenori Lea. 



Proc. A. X. S. Phila., 1864, p. 109 (Santa Rita Valley, Kansas?, and Alex- 

 andria, Louisiana) ; Obs. Gen. Unio, etc., XI, p. 13.5, pi. 24, fig. 108. 



S. mooresiana Lea, Proc. A. N. S. Phila., 1864, p. 109 (Court House Rock, 

 Platte river, on the California route) ; Obs., XI, p. 136. pi. 24, fig. 109. 



S. Hneata W. G. Binnev, Proc. A. X. S. Phila., 1857, p. 19; Man. Amer. Land 

 Shells, p. 174. 



This species is characterized by its very full, rounded whorls and 



irregular sculpture, often with traces of spiral lines, though as frequently 



without them. Having part of the original specimens of the above 



synonyms before us, we are convinced that the three supposed species 



cannot be separated, although one would hardly expect the same form 



to range from the lower Mississippi to and throughout the arid great 



plains and the mountain region of Colorado and New Mexico. 



Succinea greerii Tryon, described from Vicksburg, Mississippi, is a 

 little less swollen, with the suture not quite so deep, but it is doubtful 

 whether the slight differences shown by the lot of eight specimens 

 will prove constant. 



The species belongs to the campestris group. 



We took a few specimens of S. grosvenori at San Antonio, Texas, with 

 S. concordialis and a large form of *S. avara. 

 Succinea avara Say. 



Texas: !>an Marcos, Hays county; Comal county; San Antonio, 

 Bexar county; Devil's river, Val ^'erde county. Arizona: Benson, 

 Cochise county. 



AURICULID^. 

 Caryohium exile H. C. Lea. 



San Marcos, Hays county; New Braunfels, Comal county; Hondo 

 river, Medina county, and Devil's river, Val Verde county, Texas. 

 Common in drift debris. 

 Carychiuin exiguum (Say). 



Drift of Hondo river, Medina county; of Devil's river, Val Verde 

 county, and of Guadalupe river, Comal county, Texas. 



LYMN^IDJE. 

 Lymnaea columella Say. 



New Braunfels, Comal county, Texas. A single slender specimen. 

 Lymnaea desidiosa Say. 



Texas: San Marcos, Hays county; New Braunfels, Comal county; 

 San Antonio, Bexar county ; Rio San Filipe, Val Verde county. 

 Lymnaea humilis Say. 



Guadalupe river, Comal county. Texas. 

 11 i 



