L6 



Material Examined 



The specimen is fully as large as Glacier Park calif ornicum, but is light- 

 er in colour, the striae are finer, it has a full half whorl more (4|), the whorls 

 are much narrower, especially as seen from the base, and the umbilicus 

 is conspicuously wider and more funnel-shaped. Specimens of Pygmceum 

 from Unity, Maine, are in more complete accord, but have rather coarser 

 sculpture, a half whorl less, and are only about two-thirds as large. Some 

 Ohio pygmoeum at hand are even smaller than the Maine ones, are much 

 flatter than the Albertan shell, and have nothing like so tremendous an 

 umbilicus, but to judge from the measurements of specimens of this species 

 given by Walker and others, both these last two lots may be below the 

 average in size. The habitat is very far removed from the nearest prior 

 record of pygmceum, and it may be that the peculiarities noted, if borne 

 out in further material, are sufficient to justify some manner of separate 

 recognition for the race. The specimen was previously examined by Dr. 

 Sterki who determined it to be P. pygmceum. Its more important measure- 

 ments are : 



Major diameter 



Lesser diameter 



Altitude 



Diameter umbilicus. . 



1 -6 mm. 

 1-4 " 

 1-0 " 

 0-48 " 



Succinea avara Say 1824 



1824. Succinea avara Say, App. Long Exped., p. 260, pi. 15, f. 6. 

 1885. Succinea avara Binney, Man. Am. Landsh., pp. 31-33, 36,59, 337. 



339, 497, f. 366, 369. 

 1893. Succinea avara Taylor, Nautilus, vol, 7, p. 86 (recorded from 



Laggan, Alberta). 

 1895. Succinea avara Taylor, Ottawa Nat., vol. 9, pp. 176, 177 (recorded 



from near Macleod and Little Bow river, Alberta). 



1906. Succinea avara Vanatta, Nautilus, vol. 20, p. 95 (recorded from 



Field, B.C.). 



Material Examined 



