154 PROCEEDINGS OF THE CALIFORNIA 



37 Physa costata Netcc. Clear Lake. The animal like that of P. 

 diaphana and variety politissima, also common there. 



38 CarinifexNewberryi Lea. Owen's Valley, [Hemp/nil] the most 

 southern locality. Clear Lake, variety minor common, and the animal undis- 

 tinguishable, externally, from that of Planorbis amnion, also found there. 



39 Gyraulus vermicularis GUI. Truckee, rare,5,86G feet elevation. 

 Portland, Oregon — Dunn. Merced Falls and Santa Cruz, its southern limits, 

 about latitude 37°. 



40 P ni p h 1 y X e f f u s a Led. var. s o 1 i d a Dall. Near White Pine, 

 {Hemphill, who sent them through Harford to Dall, not " Clear Lake," where 

 no species is found). It seems scarcely worth a name as a variety of P. effusa. 

 I found the latter rare at Tehama. Sacramento Valley. 



41 Aneylus fragilis Trijon. Merced Falls and Santa Cruz, common, 

 and exactly alike, except smaller at former place. 



42 Gundlachia Californica Rivl. Merced Falls, rare with last, 

 under flat stones in brooks running from springs. 



43 Aninicola turbiniformis Trijon. Near Fort Hall, Idaho — 

 Br. Reid. Animal of Truckee specimens is exactly like Amnicola externally. 



44 Pomatiopsis intermedia Tryon. Near Pioneer Cave, Nevada 

 county. San Francisco, near Industrial School — Dunn, Carlton. Santa Cruz 

 — Dr. Anderson. White Pine — Hemphill. The last are from near the original 

 locality, and only differ from types in being brovm, when the "dark green" 

 Conferva is removed. Those from nearer the coast are distinguishable only by 

 smaller size. I have determined the animals of those from near this city to agree 

 in generic characters with P. lapidaria. It may be identical with P? Binnet/i. 



45 Fluminicola Nuttaliana Lea. Tehama, Sacramento Valley. 

 Also Warm Springs, near Salt Lake (and probably Snake River) — .0/-. Renl. 

 None of these approach F. ? {"Leptoxis") fmca Hald. ("from Salt Lake" — W. 

 G. Binney, in Land & F. W. Shells, pt. III., p. 92) which is probably wrongly 

 located and of another genus. The specimens include varieties seminalis Hds., 

 and Hindsii Baird. 



N, B. — Among the sixteen forms of raollusea found by me in and around 

 Clear Lake, after most thorough search (some being limited to special parts), I 

 failed to find Xos. 40 and 45 or the following, and do not believe they exist there, 

 though reported either in print or on manuscript labels : 



Physa gyrina Say. Dr. Veatch in Museum California Academy. 



Cochliopa Rowellii Tryon. Mr. Rowell thinks he may have got it at 

 Panama, or elsewhere. 



Besides the twelve above mentioned, the following are found in or around the 

 lake: 



Ariolimax Columbianus Gld. Rare in September. 



Limnophysa var. Gabbii Tryon. Not rare. 



L. o b r u s s a Say. Cache creek, rare, with P. diaphana and No. 8. 



Valvata virens Tryon. Very common throughout lake. 



The Borax, Soda, Alum, Iron, Sulphur, etc.. found around the lake do not 

 effect the taste of the water, and do not seem to influence animal life, except in 

 limited spots where no mollusca are found, perhaps on account of subaqueous 

 mineral springs. 



