yo LAND AND FRESH WATER MOLLUSKS 



Hudson Bay ! Fort Resolution, Great Slave Lake ! Winisk, Kawino- 

 gans, and Attawapiskat Rivers, S. E. Keewatin ! (Mclnues). 



Fig. 59. Lymneea catascopium Say, var. Fig. 60. Lymncea catascopium Say 

 sumassiBd. (British Columbia). (Delaware). 



Var. sumass/: Snake River, Idaho! Lake Washington, Seattle! 

 Sumas Prairie, British Columbia. 



Qiiite variable and frequently confounded with Z. adelince, L. buli- 

 tuoides^ L. solida^ etc. The Pacific Coast form is quite close to the 

 typical form of the species, but is thinner, less uniform, and some- 

 times larger. Binney's figure 57 is made from a specimen probably 

 of a rather swollen variety of palustris. 



•Lymnaea (Stagnicola) adelinae Try on. 



Lunnaa adelince Tryon, Mon. Limn., p. 82 (108), pi. xvill, fig. 6, 1872 

 (San Francisco, Calif.). 



Range. — California to Vancouver Island, B. C. 



A small species, recalling L. bidimoides rather than catascofiuiri., 



and perhaps identical with Lea's original bulimoides ., 



^\ as indicated by his types, but not with L. techella 



{ (<\ Haldeman, which is very generally labelled buli- 



\^) moides. 



Fig. 61. Lym- Lymnaea (Stagnicola?) perpolita n. sp. Plate 11, 

 ngs. 6, 6. 



Shell small, translucent, dark amber color, with a darker line at 

 resting stages ; smooth, except for fine lines of growth, brilliantly 

 polished ; whorls four, tumid, rapidly increasing, separated by a pro- 

 nounced suture ; spire short, rather obtuse ; aperture ovate, longer 

 than the spire, with a very thin wash of callus on the spire, the pillar 

 lip slightly reflected, with a small perforate umbilicus behind it ; pillar 

 straight, with no twist or fold, outer lip thin, sharp. Length of 

 shell 1 1 ; of aperture 7 ; breadth of shell 8.5 ; of aperture 4.5 mm. 



Range. — Nushagak, Bristol Bay, Alaska. 



This shell is so elegantly polished that it may be an Amphipeplea. 

 It has the rich dark amber color of some Succineas. I have seen hut 



