198 PROCEEDINGS OF THE ACADEMY OF [Oct., 



Station XV. Granite Park Trail, bottom of McDonald Creek 

 Canyon under Haystack Butte; alt. 3650 ft.; August 29, 1916; the 

 Oreohelices found aestivating among a growth composed principally 

 of Rubacer, Rihes, Urtica, Fatsia, and cow parsnip, the Politahinney ana 

 in association. 



Station XVI. Granite Park Trail, bottom of McDonald Creek 

 Canyon opposite Glacier Wall; alt. 3550 ft.; August 29, 1916; same 

 characteristic plant association as for preceding station. 



Station XVII. Granite Park Trail, bottom of McDonald Creek 

 Canyon, under Mt. Cannon; alt. 3450 ft.; August 29, 1916; same 

 characteristic plant association as for preceding two stations. 



Station XVIII. Belton, Montana, just outside southwestern 

 boundary of Park; alt. 3300 ft.; E. H. Dole, August 30, 1916. 



Reference to a map will show that Stations I-III are in the Atlantic 

 drainage basin, IV-XII in the Arctic drainage basin, and XIII- 

 XVIII in the Pacific drainage basin. The terrestrial species as a 

 rule were found to occur in all three watersheds, but Polita binneyana 

 and Striatura milium pugetensis were noted only on the Pacific side. 



Census of Species Taken. 



The accompanying table gives a good idea of the relative abun- 

 dance of the various species collected, both absolutely and with ref- 

 erence to the station and drainage data. 



Notes on the Species. 



Oreohelix cooperi apiarium new subspecies. Plate X. 



The shell is large for this group of Oreohelices, strongly elevated, 

 with an obtuse apex. The spiral sculpture is obsolete below, but 

 strong on the upper half of the whorls where it consists of numerous 

 fine striations, quite visible to the naked eye, which are interrupted 

 by the coarse and \ery irregular lines of growth. The periphery 

 is obtusely angular in front, becoming rounded or with just the 

 faintest suggestion of angulation on the remainder of the last whorl. 

 The umbilicus is narrow and deep, contained in the diameter about 

 six times, its circular outline partially interfered with by the slightly 

 reflexed inner lip. 



The color is extremely variable, the ground color of the shell 

 ranging from a very light brownish cream, almost white, through 

 shades of yellowish brown to dark chestnut, and tones of gray to a 

 livid brownish slate. The adult shell usually shows two narrow 



