30 University of Washington Publications in Geology [Vol. I 



Collection) west bank of Cowlitz River near Vader, Lewis County, section 28, 

 Township 11 North, Range 2 West. 



GENUS EPITONIUM 



SUBGENUS BOREOSCAI ( A 



EPITONIUM (BOREOSCALA) WASHINGTONENSIS n. sp. 

 Plate XI, Figure 19 



Description. Shell large, elongate and thick; whorls eight or nine, convex, 

 bulbous in shape ; suture distinct ; surface ornamented by about 10 rounded, 

 slightly elevated, revolving ribs with numerous finer, intervening striae; the 

 revolving ribs are crossed by ten very strong varices which extend over all the 

 whorls, the varix of each lower whorl overlapping at the suture, the correspond- 

 ing varix of the succeeding whorl ; every other varix thickened ; all are striate 

 longitudinally ; interspaces about two or three times the width of the varices ; the 

 basal, spiral rib slightly angulates the body whorl ; aperture subovate, margin 

 stoutly thickened. 



It is interesting to note that the living representatives of the subgenus to 

 which this handsome shell belongs are all of the boreal waters. 



Dimensions. Altitude 35 mm.; width of body whorl 17 mm.; apical angle 

 30. 



Occurrence. At locality 319 (University of Washington Palaeontological 

 Collection), McClarety ranch on the south bank of Stillwater Creek, one mile west 

 of Vader, Lewis County, in Section 30, Township 11 North, Range 2 West. 



GENUS LITTORINA FERUSSAC 



LITTORINA MOUNTSOEOENSIS n. sp. 



Plate XI, Figure 12 



Description. Shell small, smooth ; apex acute ; spire about one-half the 

 length of the body whorl ; whorls six, sides straight ; suture linear and only 

 minutely excavated ; aperture oval ; anterior end of outer lip not completely entire. 



Dimensions. Altitude 7 mm.; width of body whorl 4 mm. 



Occurrence.- At locality 337 (University of Washington Palaeontological 



