PLATE X. 



UxiO SUPRAGIBBOSI'S (page (36). 



Figure 1. Side view of a specimen, shewiiiL' the left valve. 



Unki seneotus (page (j'7). 



Figure 1'. .Side view of a supposed small ^•ariety of this species, from the 

 Soutli Sanl;atche\\an, shewing tlie right valve. 



Unk) prisci.'s (page G5). 



Figure I!. A very young hut perfect specimen of a t'n/V),from the South 

 Saskatchewan, which may be referable to this species, but 

 which accords ecpially well with the idiaracters of V. viIukIuh, 

 Meek. The larger and more typical Canadian examples of 

 U. priscuif are not figured here, as the species has been well 

 illustrated hy M(>ek and Dr. C. A. AVhite. 



Eytophorus (?) GLAUER (page flM). 



Figure 4. Dorsal view of a nearly perfect specimen with the test preserx'ed. 

 " 4«. Cast of the interior of the shell of a larger individual. 

 " 4'). Half gr( iwn shell, with the a|icx broken off, to shew the sculpture 



of the bod\'-whorl. 

 " 4c. A very young .shell, mu(4] enlarged, to shew the narrowly 



acuminate spire and slender apical \'olutions at this stage of 



growth. The (;ross-lincs to tlie right indicate the actual 



size. 



Planobbis rAi:c[VOL\is ()iage 71). 



Figure 5. Left side of the most perfect specimen known to the writer, 

 much enlarged. The cro>s-lines to the right shew the 

 natural size. 



Figure (i. 



Mela.xia (?) iNscuLT'TA (page To). 



Dorsal \iew of a nearly perfect specimen from the South Sas- 

 katchewan. 



I'^igure 1. 



G-ONioBAsis sijBTORTUosA (page 74). 



Dorsal ^iew of a perfect and well y)reserved specimen, also from 

 the South Saskatchewan. 



HYDltOBIA SI BOYLIMJRACEA (page 75). 



Figure S, Ventral or " apertural " view of the type specimen, much 

 enlarged. 



