LYMNZIDA@ OF NORTH AMERICA. 407 
ensis has probably been recorded under the name of palustris, and in 
many collections may repose under the name of swmassi, binneyi or 
solida. It is, however, a distinct species related to the catascopium 
group. Mr. H. O. Hinkley collected the specimens. 
Galba gabbii (Tryon). Plate XLII, figures 32-36. 
Limnea gabbii Tryon, Amer. Journ. Conch., I, p. 229, pl. 23, fig. 2, 1865; 
Con. Hald. Mon., p. 109 (83), pl. 18, fig. 7, 1872. 
Limnophysa gabbii Tryon, Amer. Journ. Conch., I, p. 254, 1865. 
Limnea adeline var. gabbii Cooper, Proc. Cal. Acad. Sci., IV, p. 96, 1870. 
Limnophysa var. gabbii Cooper, Proc. Cal. Acad. Sci., 1V, p. 173, 1870. 
SHELL: Small, rather thin, ovate; periostracum brownish, rather 
dark in some specimens; surface dull, with rather rough, close set 
growth lines and fine impressed spiral lines; surface frequently mal- 
leated ; nuclear whorls 11% rounded, smooth, almost jet black in color; 
similar in outline to those of jacksonensis; whorls 5, rapidly enlarging, 
flatly rounded; body whorl very large, flatly rounded; spire short, 
broadly acutely conical; sutures impressed but not deeply indented; 
aperture large, somewhat lunate, a trifle oblique, generally more than 
half the length of the entire shell; parietal wall with a thin callus; in- 
ner lip narrow, reflected, so as to cover the umbilical region leaving, 
rarely, a very small chink; outer lip with an internal varix ; axis slightly 
twisted, causing a more or less distinctly marked plait. 
Length. Width. Aperture length. Width. 
13.10 7.10 8.00 4.00 mill. Type. 
16.25 9.10 9.75 Ar ee is 
14.75 8.50 8.50 ALE) | 3 
14.00 7.00 8.50 450 “ Clear Lake, Call 
11.00 6.00 6.50 SOO. 3 = 
Types: Academy of Natural Sciences, Philadelphia, twelve speci- 
mens, No. 58526. 
Type Locarity: Clear Lake, California. 
ANIMAL, JAW, RADULA and GENITALIA: Unknown. 
RANGE: California. A species of the Californian region and of 
the Transition and Upper Austral (Upper Sonoran) life zones. 
RECORDS. 
CALiFoRNIA: Clear Lake, Modoc Co. (Button; Gabb; Hemphill; Tryon; 
Veatch); Sacramento Valley (Rowell); Islais Creek, San Francisco Co. 
(Cooper); San Francisco Co. (Hemphill). 
GEOLOGICAL DistRiBUTION: Unknown. 
Ecotocy: Not recorded. 
REMARKS: Gabbii somewhat resembles some forms of catascop- 
ium but differs in having a more acute, flat-sided spire, a more clon- 
gated aperture and a less distinctly marked plait on the columella. The 
