1919.] NATURAL SCIENCES OF PHILADELPHIA. 203 



at which we eventually ran across it, in which case it may prove to 

 be of greater relative abundance than my figures indicate. The 

 record is apparently a new one for the state. 



Polita chersinella (Dall). 



There is a decided discrepancy in the respective descriptions and 

 figures given of chersinella by Dall and Binney, and it is perhaps not 

 yet just certain what chersinella really is. However that may be, I 

 am unable to distinguish the present specimens froin material taken 

 in the Californian Sierras, in spite of the tremendous jump in range. 

 Compared with a somewhat larger specimen of the latter taken near 

 Lake Tahoe by Mr. Allyn G. Smith, the largest of the Glacier Park 

 shells has about one-half a whorl more, has rather more evenly 

 rounded whorls and aperture, and a rounder, flatter spire. The 

 generic position here adopted for the species is at best doubtful, 

 but I feel convinced that it is not a Euconulus, a certain ease of con- 

 fusing one's shells in the field with E. f. alaskensis notwithstanding. 

 It has not been reported pre\'iously outside of California, where it 

 is a characteristic alpine form. 



Striatura milium pugetensis (Dall). 



One would naturally anticipate that these shells would fall in 

 line with theu* Washington neighbor, pugetensis, rather than with 

 the far eastern form, yet Mr. Vanatta considers them "not typical of 

 the var." but "nearer the regular milium." With the first part of 

 the opinion quoted I concur, but not with the second. The Glacier 

 Park shells are not only larger on the average (major diameter 1.67- 

 1.85 mm.) than any (e. g.) Maine or Massachusetts milium I have 

 seen, but possess the strong spiral sculpture of the first whorl and a 

 half which is one of the striking features of the otherwise weakly 

 differentiated pugetensis. Nor is the beautiful silky sculpture of 

 the later whorls, particularly the last, which one sees in New Eng- 

 land specimens and which has been so carefully described and figured 

 by Morse ('64, p. 19, pi. 2, fig. 7), at all so exquisitely developed in 

 the western shells. 



As compared with specimens of typical pugetensis from Seattle, 

 the Montana shells are notably larger, flatter, and coarser in appear- 

 ance, slightly approaching in some respects the giant southern meri- 

 dionalis Pilsbry and Ferriss. It may he that one day this mountain 

 race will require a name of its own. Meanwhile the record is a new 

 one for the state. 



