acade:\iy of sciexces. 153 



This is one of the most interesting discoveries yet made among our land- 

 shells, being the first of the group found on our Pacific Slope, and also the 

 simplest in its dentation, which, with the open umbilicus ally it it to Triodopsis. 

 This combination is not found in any eastern species of tiie group, though the 

 characters occur separately. 



27 d o t r o p i s d e v i a GI(l.[Cp.) Varieties of this species from Oregon 

 (Dunn),-dve sometimes toothless, some with umbilicus hidden by lip, and one with 

 several narrow, pale bauds, probably the result of disease. Some are nearly as 

 small as large examples of Columbiana, and very like them. 



28 Triodopsis 1 o r i c a t a GId. Found in the Sierra Nevada, between 

 the same latitudes as in the coast range. At Shasta City (Yoy), Placervilie, 

 2,500 feet alt. (Rowell), Alta, Nevada Co., 3.(i00 feet, by me. and Clark's, 

 Mariposa Co. 4,000 feet, (Dunn.) Not high on coast mountains ? 



29 Pupa Arizonensis Gabb. Found common at White Pine by 

 Hemphill. Of nine specimens, one only differs in having a parietal tooth, like 

 liorducea of Binney & Bland, (which does not agree with liordacea Gabb.) 

 Another is larger with one more whorl, (6) but no longer than the type. 



ZuA Leach. Shell pupjBform, tapering toward both ends, lustrous, pellucid 

 mouth nearly half of total length, peristome simple, thickened, the ends con- 

 nected by a callus, imperforate. 



30 Z. LUBRicoiDES Stimpsou. Wh. 5-6, the last 0.40 of total length, ape.x 

 obtuse, lip often brownish ; diam. 0.10; alt. 0.24. 



This curious little shell was found by Harford in Alaska, but, though com- 

 mon eastward, was only discovered in California this year by C. D. Voy, who 

 found two at Indian Valley, Plumas Co., with Nos. 14, 17, and Piipilla 

 corpulenia Morse. 



Binney & Bland follow most authors in uniting this with the European sub- 

 cylmdrica Linn., [lubrica Miill.) but Stimpson and Pfeiflfer saw differences in 

 the shells, while Morse has shown others in the animal. Whether the Alaska 

 shell differs from that of Siberia, or whether several species are not confounded 

 in the Old World, the study of the animals must show. 



31 Limnophysa desidiosa Say. Birch Creek, Idaho, Hemphill. Not 

 uncommon west of the Sierra Nevada. 



32 L. Nuttalliana Lea, Warm Springs, near Salt Lake, Utah, Dr. 

 Reid, 10 specimens, presenting several varieties. 



33 L. h u m i 1 i s Saij. With the preceding. Dr. Rc/d, two only. Mon- 

 terey, Dr. Canfield. 



34 L. T r y n i a n a Lea. Seven, either from near Salt Lake or from Fort 

 Hall, Idaho, Dr. Reid. The first of this well-marked species, from east of the 

 Sierra agree closely with coast types. 



35 Physa Saffordti Lea. Common with preceding ; also from Snake 

 River Valley, Dr. Reid; Nevada and eastern Idaho, Hemphill, with three 

 varieties of color and size. New to west slope. 



36 Physa Hawnii Lea? Specimens from near White Pine [Hemphill) 

 seem nearer to this Kansas species than any other. They resemble P. Carltomi 

 L"a., in form, and like that have three lip-bands. 



Puoc. Cal. Acad. Sci., Yoi,. IV.— II -^pk. 1871. 



