362 THE CHICAGO ACADEMY OF SCIENCES. 



Galba proxima rowellii (Tryon). Plate XXXVIII, figures 14- 



21. 



Limnaa rowellii TRYON, Amer. Journ. Conch., I, p. 228, pi. 23, fig. 1, 1865 ; 

 Con. Hald. Mon., p. 95 (69), pi. 17, fig. 1, 1872. 



Limnophysa rowellii TRYON, Amer. Journ. Conch., I, p. 250, 1865. 



Limncea palustris var. rowellii WOOD, Nautilus, V, p. 56, 1891. KEEP, West 

 Amer. Shells, p. 314, 1904. 



Limnophysa palustris var. rowelii COOPER, Zoe, I, p. 196, 1890. 



Lymncea palustris var. rowelii DALL, Alaska Moll., p. 76, fig. 56 g, 1905. 



Limncea umbrosa var. rowelii COOPER, Proc. Cal. Acad. Sci., IV, p. 96, 1870. 



Limnaa proximo, SOWB., Conch. Icon., Lim., pi. 7, fig. 44 b, 1872. 



Limnaa reflexa TRYON, Proc. Phil. Acad., 1863, p. 149. 



Limnophysa reftcxa KEEP, West Amer. Shells, p. 149, 1904. 



Limn&a umbrosa TRYON, Proc. Phil. Acad., p. 149, 1863. 1 COOPER, Proc. 

 Cal. Acad. Sci., IV, p. 96, 1870. 



Limnea umbrosa GOULD, U. S. Exp. Exped., p. 122, 1852 (?). 



Limnaa palustris var. umbrosa WOOD, Nautilus, V, p. 56, 1891. KEEP, 

 W. Amer. Sh., p. 314, 1904. 



Limnaa palustris michiganensis WALKER, Nautilus, VI, p. 33, 1892 (part?). 



Lymnaa umbrosa COOPER, Pac. R. R., Rep., XII, pt. 2, p. 378, 1860. 



Lymnaa proxima rowellii BAKER, Bull. State Lab. Nat. Hist., VIII, p. 493, 

 1910. 



SHELL : Elongated, acute, rather thin ; periostracum varying from 

 light yellowish horn to almost black ; surface dull to shining ; sculpture 

 as in proxima; lines of growth conspicuous on the body whorl ; whorls 

 six to seven, flatly rounded, somewhat oblique, loosely coiled, the body 

 whorl flatly rounded, compressed; spire acute, elongated, generally 

 longer than the aperture; sutures well marked, sometimes heavily im- 

 pressed; aperture very elongate-ovate, varying from narrow to wide 

 and flaring ; peristome thin with a light chestnut-colored internal varix ; 

 inner lip narrow, erect, the parietal callus closely appressed and thin or 

 very thick ; there is a narrow umbilical chink in some specimens ; colu- 

 mella with a distinct, sometimes heavy, ascending plait ; axis twisted as 

 in palustris. 



Length. Width. Aperture length. Width. 



27.25 10.50 12.00 5.00 mill. Type. 



24.00 10.00 10.00 4.50 " 



24.50 10.00 10.50 5.00 " San Francisco Co., Cal. 



22.50 9.00 10.00 4.50 " San Francisco, Mt. Lake. 



29.00 12.00 15.50 7.50 " " " 



32.00 14.00 15.50 8.50 " 



TYPES: Academy of Natural Sciences, Philadelphia, three speci- 

 mens, No. 58588. 



VThese references are believed to have been based on the different forms 

 of rowellii, as the true umbrosa (=elodes) has not been seen from west of the 

 Rocky Mountains. 



