122 THE NAUTILUS. 



generally dry at this time of the year, although there are numerous 

 brooks and rills, with here and there an open swampy meadow or 

 cienaga. 



Bear Lake is a partly natural, partly artificial reservoir, some five 

 or six miles long by perhaps a half a mile wide, and about sixty-five 

 hundred feet above sea-level. It is the home of multitudes of small 

 forms, most of them being species of wide distribution. High up on 

 the mountain to the south of the lake is Bluff Lake, a small summer 

 resort, at an altitude of 7,550 feet. In this case the " Lake " is only 

 a large cienaga with a swamp at its lower end. This swamp, with 

 the creek which flows from it, proved a very interesting locality, 

 while all the land mollusks seen on the trip were found either under 

 sticks and logs at the edge of the meadow or nearby in the woods. 



It is notable that none of the larger Helices were found, although 

 Glyptostorna newberryanum should occur here just as it does in the 

 neighboring San Gabriel Range, and I have seen living specimens 

 of Epiphragmophora tudiculata W. G. B. from the base of these 

 mountains. 



A list of the species obtained is herewith appended : 



Pisidium californicum Newcomb (?). Two " somewhat different 

 forms " were thus determined by Dr. Sterki, who says that P. cali- 

 fornicum itself is somewhat in doubt. They occur together, and are 

 rather common in the quieter pools of Bluff Lake Creek, in ditches 

 in the meadow, and in the swamp. 



A number of minute Pisidia found in a spring on a nearby hill- 

 side are probably young of the same. 



Pisidium (sp. ?). Two specimens from the swamp are of" differ- 

 ent shape from the remainder," according to Dr. Sterki, but whether 

 or not distinct he was unable to say. 



Musculium raymondi J. G. Cooper. Found commonly in the 

 swamp, and rather rarely in the creek at Bluff Lake. 



Valvata (sincera, Say ?) var. Bluff Lake Swamp (two speci- 

 mens) and in Bear Lake, where it seems fairly common on and 

 under stones. 



Lymncea palustris Mull. A small variety of this species occurs 

 commonly in Bear Lake. It is extremely variable, generally tend- 

 ing toward the form called nuttalliana by Lea. The maximum 

 longitude of the numerous specimens collected in Bear Lake is but 

 about ten millimeters. 



