1917.] NATURAL SCIENCES OF PHILADELPHIA. 53 



Prime and Fluminicola fusca (Hakl), both abundant, one example of 

 Physa identified by Walker as P. ampullacea, var. close to propinqua. 



Sta. 1|, about ten miles above McCammon, on south side of Port 

 Neuf River, north side of gulch on east side of mountain about three 

 miles south of west from Lava Hot Springs. 

 Oreohelix tenuistriata H. and D. 



This is the type locality of the species, the description of which 

 was based upon three imperfect and immature examples. We 

 revisited the station, where a search of several hours resulted in 

 obtaining about thirty specimens alive, mostly immature, and twice 

 as many dead shells, under shrubs and mats of the radical leaves of 

 Balsamorrhiza sagittata (Nutt.), overhanging small piles of limestone, 

 in open spaces among the mountain mahoganies, which are here the 

 largest we have seen. The dense blanket of small leaves directly 

 under the mahoganies is not favorable to the snails. This material 

 shows that the species is a larger, finer one than was indicated by the 

 tj'pe and co-types, and compels an amendment of the description, 

 as follows: Shell rather depressed to moderately elevated; whorls 

 5, convex, carinated almost to the aperture; color very light brown, 

 with two almost undiscernible darker spiral bands, one well above, 

 the other scarcely below, the periphery. The spiral riblets on the 

 best specimens, especially bleached ones, may be seen with the 

 unaided eye. The two largest examples measured are each 13.5 mm. 

 in major diameter, and one is 8 mm., the other 9.5 mm. in altitude. 

 Otherwise the original description holds good. The beautiful 

 sculpture distinguishes it from all other species of the genus we have 

 examined. Pilsbry writes that in genitalia this species is of the 

 haydeni type. 



In the gulch bottom, just below the Oreohelix slope, among aspens 

 and mountain maples, we obtained Vitrina alaskana Dall, Zonitoides 

 arhorea Say, Vallonia cyclophorella Ancey and Euconulus fulvus 

 alaskensis Pilsbry. 



Sta. 63, next gulch north of Sta. 1^. We found here a few Oreohelix 

 tenuistriata H. & D. 



Sta. 64, bank of Port Neuf River, two or three miles below Sta. 63. 

 We obtained here the following: 



Sphcerium near aureum Prime, Pyramidida cronkhitei anthonyi 



abundant. , Pils. 



Succinea avara Say. Fluminicola fusca (Hald.). 



Succinea rusticana Gld. Lymncea humilis modicella Say. 



Planorbig' parvus Say. 



