362 THE CHICAGO ACADEMY OF SCIENCES. 



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

 21. 



Limncca rowellii Tryox, Amer. Journ. Conch., I, p. 228, pi. 23, fig. 1, 1865; 

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



Limnophysa rowellii Tryox, Amer. Journ. Conch., I. p. 850, 1865. 



Limncca 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. 



Lymncca palustris var. roivelli Dall, Alaska Moll., p. 76, fig. 56 g, 1905. 



Limncca umbrosa var. rowelii Cooper, Proc. Cal. Acad. Sci., IV, p. 96, 1870. 



Limncca proxima Sowb., Conch. Icon., Lim., pi. 7, fig. 44 b, 1872. 



Limncca reflexa Tryox, Proc. Phil. Acad., 1863, p. 149. 



Limnophysa rcilcxa Keep, West Amer. Shells, p. 149, 1904. 



Limncca umbrosa Tryox, 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 (?). 



Limncca palustris var. umbrosa Wood, Nautilus, V, p. 56, 1891. — Keep, 

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



Limncca palustris michigancnsis Walker, Nautilus, VI, p. 33, 1892 (part?). 



Lymncca umbrosa Cooper, Pac. R. R., Rep., XII, pt. 2, p. 378, 1860. 



Lymncca 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. 



^ength. 



Width. 



A PI 



erture ler 



igth. 



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 Xatural Sciences, Philadelphia, three speci- 

 mens, Xo. 58588. 



^hese references are believed to have been based on the different forms 

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



Rocky Mountains. 



