368 THE CHICAGO ACADEMY OF SCIENCES. 
Galba traskii (Tryon'). Plate XXXIX, figures 6-10. 
Limnea traskii Tryon, Proc. Phil. Acad., p. 149, pl. 1, fig. 13, 1863—CoeRr., 
Rep. Brit. Asso., 1863, p. 674, 1864—Binney, L. & F.-W. Sh. N. A., II, p. 60, 
fig. 94, 1865——CaArRLToN, Proc. Cal. Acad. Sci., IV, p. 51, 1869—Tryon, Con. 
Hald. Mon., p. 96 (70), pl. 17, fig. 3, 1872.—Crr., Smith. Mis. Coll., 1872, p. 160.— 
Ciessin, Mal. Blatt, n. s., III, p. 82, 1881—?WEsTERLUND, Vega Exp., IV, p. 163, 
1883.—CKLL., Journ. Conch., VI, p. 258, 1890. 
Lymnea traski Dati, Alaska Moll., p. 74, 1905. 
Limneus traskii CLesstn, Kiister, Conch. Cab., p. 386, taf. 53, fig. 3, 1886 
(fig. not good). 
Limnophysa traskii Tryon, Amer. Journ. Conch., I, p. 254, 1865. 
Limnea elodes var. traskit Cooper, Proc. Cal. Acad. Sci., IV, p. 96, 1870. 
Limnea palustris var. traskii Woop, Nautilus, V, p. 56, 1891—Keep, West 
Amer. Sh., p. 314, 1904. 
SHELL: Ovate, acutely conical; periostracum light horn colored, 
surface dull to shining; growth lines very distinct, frequently raised 
to form ridges, crossed by distinct spiral lines; some of the upper 
whorls are frequently malleated; whorls 6 to 6%, well rounded, 
particularly the body whorl; spire short, but acutely conical, forming 
a rather broad pyramid; sutures very deeply impressed, constricted ; 
aperture ovate or roundly ovate, a little less than half the length of 
the shell; outer lip thin, without pronounced varical thickening; inner 
lip flatly reflected over the umbilical region forming a rather broad 
expansion, leaving a very distinct umbilical chink; the callus on the 
parietal wall is sometimes thick and heavy, rendering the aperture 
continuous; the inner lip is flat and smooth (recalling in this respect 
the Galba groups of Lymnzas) and there is no distinct columellar 
plait, although in some specimens there is a thickening of the axis, 
which is slightly twisted. 
Length. Width. Aperture length. Width. 
13.00 7.00 5.50 3.50 mill. Type. 
16.00 9.00 8.00 Gp San Francisco, Cal. 
20.00 10.50 9.25 5500 nes an 
22.50 11.50 10.50 iyyiey o % 
21.25 10.00 9.50 Ass ON ta + 4 
23.00 11.00 10.50 B5Op <6 eo es 
16.00 8.00 7.00 RY = AN sArZovne 
21.50 10.00 10.50 6.00 “ Banff, Alberta. 
1The following references to traskii cannot be verified: 
Limnea traski Ingersoll, Bull. U. S. Geol. & Geog. Surv. I, p. 139, 1875; 
Rep. U. S. Geol. & Geog. Surv. Terr., 1874, p. 406, 1876. 
Lymnea traski Henderson, Univ. Col. Studies, IV, p. 185, 1907. 
Limnea traskii Walker, Nautilus, VI, p. 33, 1892. 
Limnea traski, Walker, Rev. Moll. Mich., 1894, pp. 18, 22. 
Ingersoll says, ‘‘Comes near to L. traskii, but distinct.’—Dr. James Lewis 
in letter. Henderson’s remark that ‘‘we suspect a mixing of labels or mistak- 
ing abbreviation of California for Colorado,” may possibly be true concern- 
ing this record. Walker simply says, “Cited by DeCamp from Houghton Lake,” 
This may have been a form of palustris, which species lives in this lake, 
