PLATE II. 



CORBULA I'ERANGIJLATA (jiage 0). 



Figure 1. Side view of another adult specimen from Rye-<.4rass flat, of a 

 shorter and less arcuate form than the one represented on 

 plate 1, fig. 5. 



PanopvEA simulatrix (page 11). 



Figure '1. The most perfect specimen coUet'ted, as \iewed latcralh-. 

 " 2o. Dorsal view of the .same. 



Panop.ea ourta (page VI). 



Figure ?>. Side view of the type of this species, from Forks of Devil's 

 I'ine and Three Hills Creeks. 



Physa Copei (page 14j. 



Figure 4. Dorsal view of a specimen from I'incher Creek, which has tlie 

 aj:)ex broken off. 

 " -ill. Similar view of a smaller example of the same species, from 

 Gooseberry Canon on tlie St. IVIary Ri\-er, in which the 

 slender and acuminate spire is perfect. 



Phy.sa Copei, Va)-. Canadensis (page 14). 



Figure 5. Dorsal view of a large and tyi)ical example of this variety, from 

 I'incher Creek. 

 " .5o. Similar view of an unusually narrow variety of this shell, also 

 from Pincher Creek, referred to on i)age 16 as ap]5roaching 

 very nearly in shape to Biilimix dtavns, A\'liite. 

 " bli. Ventral view of annther specimen from tlie same locality, to 

 shew the characters of the aperture. 



PatCtla angulifera (]jage IS). 



Figure <i. The tj'pe and only specimen colletted, as seen from above. 

 " till. Basal view of the same. 



" (>h. fiutline of the .same from another [loint of view, to shew the 

 comparati\e height of the shell and shape of tlie a])erture, 



Patula obtusata (page is). 



Figure 7. Upipx'r side of the largest sjiecimen known to the writer. 



" 7a- Lower side of the same. 



" 7h. Outline of the same to show the relative height or depth of the 

 shell. 



