1917.] NATURAL SCIENCES OF PHILADELPHIA. 57 



than that he had replaced the t in exacutus with an o. We have no 

 way of ^ascertaining which form the author intended. Hence we 

 beUeve the original spelling should be retained, bad as it is, and it 

 is no worse in this respect than many other names in general use. 



Sta. 74, southwest of Sta. 72, about two miles north of east from 

 Ovid, Idaho, where the railroad track crosses Bear Lake outlet. 

 Dead shells of the following species were found in the loose sand on 

 the bank of the stream : 



Sphcerium sp. Valvata humeralis californica Pils. 



Pisidium compressum Prime. Valvata utahensis (Call). 



Pisidium near variahile Prime. Carinifex newherryi (Lea). 



Anodonta loahlametensis Lea? Lymncea proxima Lea. 



1 broken valve. Planorhis trivolvis near hinneyi 

 Succinea haydeni W. G. B. ? Try on. 



2 broken shells. Planorhis parvus Say. 

 Fluminicola fusca (Hald.). 



The Sphcerium is very large, but Sterki does not consider it S. 

 pilsbryanum St., which would be expected in this vicinity. He does 

 not venture to name these specimens. 



Sta. 75, slough from Mill Creek drainage, beside the railroad tracks 

 a mile north of east from Ovid. Musculium n. sp. abundant, gravid. 



Sta. 76, Mill Creek, where railroad crosses it south of Ovid. 



Anodonta nuttalliana Lea, one Lymncea stagnalis appressa Say. 



alive. - Planorhis trivolvis near hinneyi 



Sphcerium sp., 3 fresh shells, Tryon. 



Fluminicola fusca (Hald.). Physa ampullacea G\d. 



Sta. 73, three or four miles up Paris Canyon, west of Paris, Idaho. 

 Oreohelix cooperi (W. G. B.) common under shrubbery on limestone 

 slopes devoid of slides. A search for small snails in an aspen grove 

 near by proved surprisingly fruitless. 



Sta. 77, half a mile up St. Charles Canyon, west of St. Charles, 

 Idaho. Oreohelix haydeni hyhrida (Hemph.), with sculpture less 

 pronounced than in the Logan colony, common under the radical 

 leaves of Balsamorrhiza sagittata and shrubs, on a limestone slope 

 devoid of rock slides. A few Vallonia cyclophorella Ancey and quite 

 a number of Pupilla muscorum idahoensis n. subsp. were found. 



Pupilla muscorum idahoensis n. subsp. 



Differs uniformly from typical P. muscorum (L.) in its more 

 slender form and thinner lip. Color light to dark brown. The 



