368 THE CHICAGO ACADEMY OF SCIENCES. 



Galba traskii (Tryon 1 ). Plate XXXIX, figures 6-10. 



Limncea traskii TRYON, Proc. Phil. Acad., p. 149, pi. 1, fig. 13, 1863. CPR., 

 Rep. Brit. Asso., 1863, p. 674, 1864. BINNEY, L. & F.-W. S'h. N. A., II, p. 60, 

 fig. 94, 1865. CARLTON, Proc. Cal. Acad. Sci., IV, p. 51, 1869. TRYON, Con. 

 Hald. Mon., p. 96 (70), pi. 17, fig. 3, 1872. CPR., Smith. Mis. Coll., 1872, p. 160. 

 CLESSIN, Mai. Blatt, n. s., Ill, p. 82, 1881. ?WESTERLUND, Vega Exp., IV, p. 163, 

 1883. CKLL., Journ. Conch., VI, p. 258, 1890. 



Lymncea traski DALL, Alaska Moll., p. 74, 1905. 



Limnceus traskii CLESSIN, Kiister, Conch. Cab., p. 386, taf. 53, fig. 3, 1886 

 (fig. not good). 



Limnophysa traskii TRYON, Amer. Journ. Conch., I, p. 254, 1865. 



Limncea elodes var. traskii COOPER, Proc. Cal. Acad. Sci., IV, p. 96, 1870. 



Limncea palustris var. traskii WOOD, 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 Lymnaeas) and there is no distinct columellar 

 plait, although in some specimens there is a thickening of the axis, 

 which is slightly twisted. 



lr The 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. 



Lymnaea traski Henderson, Univ. Col. Studies, IV, p. 185, 1907. 



Limnaea traskii Walker, Nautilus, VI, p. 33, 1892. 



Limnaea traski, Walker, Rev. Moll. Mich., 1894, pp. 



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. 



