460 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. 
Utrau: 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. 
Urau: Bear Lake, Rich Co. (Hayden Survey; Sterki). 
Ecotocy: ‘Dredged in Utah Lake in August, 1883.” (Call). 
ReMarkKs: 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 
Lymnea kingti 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 
coste 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 coste are not always de- 
veloped, some specimens (pl. XXIV, fig. 23) being almost smooth. 
The coste, however, may be detected in all specimens, though the de- 
velopment is but slight in some individuals. 
Call’s figures (reproduced on pl. XXII, figs. 9-11) do not agree 
very well with the type specimens in the Smithsonian Institution, 
which correspond to those figured on pl. XXIV. They must have been 
drawn from extremely short-spired specimens, scarcely to be con- 
sidered typical. The peculiar costz 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 LEPTOLIMNEA Swainson, 1840. 
Leptolimnea Swainson, Malac., p. 338, 1840. Type, L. elongata, Sowerby= 
L. glaber (Miiller). 
Leptolimnea HALDEMAN, Mon. Lim., p. 6, 1844 (part). 
Leptolimnea Morcu, Vidensk. Meddel. Kjob., p. 298, 1864. 
Leptolimnea Binney, L. & F.-W. Sh. N. A., II, p. 67, 1865 (part). 
Leptolimnea Tryon, Con. Hald. Mon., p. 87 (61), 1872 (part). 
Leptolimnea Tryon, S. & S. Conch., ITI, p. 101, 1884. 
Leptolimnea Dati, Alaska Moll., pp. 62, 64, 1905. 
Leptolimnea BAKER, Science, n. s., XXVII, p. 943, 1908. 
Leptolimneus SANDBERGER, Land U. Sissw. Conch. d. Vorwelt, p. 787, 
1875; sole example cited L. glaber (Miller). 
