THK NAUTILUS. 63 



Vallonia pulchella (Miill.). Common with preceding, 1905. 

 Rarer in 1909. 



Acanthinula harpa (Say). Windermere. One specimen, Sept., 

 1909. 



Strobilops virgo (Pils.). Windermere. Common Sept., 1909; 

 also in woods W. ot the vilhige (Apr., 1910). All of the red variety 

 [Clapp]. 



Bifidaria pentodon (Say). Windermere. Four specimens, Sept., 

 1909. 



Vertigo ovata Say. One adult specimen in village, 190o; 

 several juv. probably of this species at Windermere, Sept., 1909. 



Vertigo gouldii (Binney). One nearly grown and several young 

 probably the same, Windermere, Sept., 1909. 



Succinea ovalis Say, (obliqua Say). Abundant. 



Succinea avara Say. The Intervale. Four specimens, 1909-'1(». 



Pyramidula alternata (Say). Common in scattered localities. 



Pyramidula cronkhitei anthonyi (Pils.). Abundant. 



Helicodiscus parallelus (Say). Windermere, Sept., 1909, and 

 woods W. of village, Apr., 1910. Rare. 



Punctum pygmaeum (Drap.). Windermere. 



Agrioliraax campestris (Binn.). Common in the village. 



Vitrina lirapida Gld. Abundant about wood piles in 1905, but 

 not seen in 1909. 



Vitrea sp. Windermere, 1909. All young. 



Euconulus fulvus (Miill.). Windermere, Sept., 1909. 



Euconulus chersinus (Say), (polygyratus Pils.). With the pre- 

 ceding and about twice as abundant. 



Zonitoides arboreus (Say). Abundant. 



Zonitoides exiguus (Stimp). Windermere, 1909. Common. 



Zonitoides milium (Morse). Windermere, Sept., H09. 



Polygyra albolabris (Say). Does not appear to be abundant, but 

 is widely distributed. 



Polygyra fraterna (Say). Several specimens in 1909. 



Summary : 



Species. Vars. 



Fresh-water lamellibranchs ... 6 + Pisidium spp. 



Fresh-water gastropods .... 16 2 



Terrestrial gastropods . . . . 24 



Total 46 + 2 + 



