.jf,n THE CHICAGO ACADEMY OF SCIENCES. 



osition of the Bonneville beds. Further study is needed to satis- 

 factorily elucidate the relationship of this curious species. 



RECORDS. 

 Utah : Utah Lake, near Lehi, Utah Co. (Call) ; Bear Lake, Rich Co. 

 (Hayden Survey; Walker); Spring Lake (Phil. Acad.); Utah Lake (Inger- 

 soll )'. 



Geological Range : Pleistocene. 



RECORDS. 



Utah: Bear Lake, Rich Co. (Hayden Survey; Sterki). 



E< ology: "Dredged in Utah Lake in August, 1883."' (Call;. 



Remarks : This curious form, dwarfed and peculiarly sculptured 

 by its unfavorable environment, seems to be a representative of Poly- 

 rhytis Meek. The species closely resembles, in many respects, the 

 LymncEa kingii of Meek, from the Tertiary formation of Cache 

 Valley, Utah, as pointed out by Call (T. c, p. 381). It has no rela- 

 tion, however, to Galba mighlesi (ampla) as stated by Call. The axial 

 tostae are irregular, elevated and in many examples very conspicuous. 

 The spire varies from long and pointed to short and wide and the 

 aperture is modified correspondingly. The costal are not always de- 

 veloped, some specimens (pi. XXIV, fig. .23) being almost smooth. 

 The costae, however, may be detected in all specimens, though the de- 

 velopment is but slight in some individuals. 



Call's figures (reproduced on pi. XXII, figs. 9-11) do not agree 

 very well with -the type specimens in the Smithsonian Institution, 

 which correspond to those figured on pi. XXIV. They must have been 

 drawn from extremely short-spired specimens, scarcely to be con- 

 sidered typical. The peculiar costae will at once distinguish this species. 



It is probable that the specimens recorded by Ingersoll (op. cit.) 

 belong to this species, rather than to catascopium, which has not been 

 authentically reported west of the Rocky Mountains. 



Subgenus LEPTOLIMN-ffiA Swainson, 1810. 



Lcptolimncca Swaixsox. Malac, p. 338. 1840. Tvpe, L. elongata. Sowerbv= 

 L. glaber (Miiller). 



Leptolimncea Haldemax, Mon. Lim., p. 6, 1844 (part). 

 Lcptolimncca Morch, Vidensk. Meddel. Kjob., p. 298, 1864. 

 Lcptolimncca Bixxev, L. & F.-W. Sh. X. A., II, p. 67, 1865 (part). 

 Lcptolimncca Tryox, Con. Hald. Mon., p. 87 (61), 1872 (part). 

 Leptolimncea Tryox, S. & S. Conch., Ill, p. 101, 1884. 

 Lcptolimncca Dale, Alaska Moll., pp. 62, 64, 1905. 

 Leptolimncea Baker, Science, n. s., XXVII, p. 943, 1908. 

 Lcptolimnccus Saxdberger, Land U. Sussw. Conch, d. Vorwelt, p. 787, 

 -ole example cited L. glaber (Miiller). 



