THE NAUTILUS. 129 



Anodonta fragilis Lam. Common (small forms). 



Sphcerium striatinum Lam. Living and dead shells abundant on 

 rocky bottom in the thoroughfare between Mud and Cross Lakes. 



Calyculina securis Prime. At the inlet not many found. 



Pisidium pauperculum nylanderi Sterki. Few specimens. 



Pisidium ferrugineum Prime. Few very fine specimens at the 

 inlet. 



Caribou, Maine, Feb., 1902. 



COLLECTING SHELLS IN MONTANA. 



BY MORTON J. ELROD, UNIV. OF MONTANA. 



[Continued from page 112.~] 



Limax montanus Ingersoll. One specimen taken at Missoula, June 

 29, '97. Slugs are rarely seen in this region. 



Eucomihis fuhus Drap. A few specimens taken near Missoula, 

 June 5, '97. 



Succinea nuttalliana Lea. At the upper end of Flathead lake, in 

 a swampy bog, quantities of Limnaea palustris Mull, with dark 

 shells, were discovered. Among these was an occasional Planorbis 

 trivolvis Say. Four specimens of S. nuttalliana Lea, were all that 

 could be found, though diligent search was made. These delicate 

 shells appear to be very scarce, since they have been taken no place 

 else. 



Polygyra devia Gld. var. hemphilli W. G. B. On May 8, 1900, 

 Arbor Day, we took to the woods along the beautiful Lo Lo creek, 

 south of Missoula, and extending up into the Bitter Root mountains 

 a distance of some 75 miles. Lunch was eaten some four miles 

 from the mouth of the creek, when we sought for specimens along 

 the banks of the stream in overflowed pools. Among and in the 

 abundant fresh deer-tracks were found scattered specimens of this 

 species and P. townsendiana Lea, var. ptychophora A. D. Br. The 

 species was not abundant, only about 15 being taken. They were 

 much scattered, in holes, under decaying vegetation, difficult to 

 discover. 



Polygyra townsendiana Lea, var. ptychophora A. D. Br. These 

 were taken rather abundantly, some 60 being the result of a two 

 hours' search along the Lo Lo creek on May 8, 1900, in connection 

 with P. devia Gld., var. hemphilli W. G. B. For details see under 

 the latter species for information. Also found in small numbers at 

 other places near Missoula. The species was also taken at both 

 McDonald lake and Sin-yale-a-min lake in the Mission mountains, 

 a couple of dozen being taken at the former place and but a few at 

 the latter. 



Zonitoides arboreus Say. A half dozen of these little shells taken 

 at Missoula June 5, 1897. 



