34 University of Washington Publications in Geology [Vol. I 



rounded below, and having revolving striae with intermediate minute lines; striae near the 

 suture on the upper part of the whorls finer than the prominent liriesi below." 



The illustration of Conrad's type shows a greater uniform convexity than 

 that described. Gabb's figure shows the whorls to be less rounded. Conrad did 

 not mention the number of revolving ribs but six or seven are represented on his 

 illustration. The Washington specimen is more like the figure of Gabb in the 

 less convexity of the whorls. Nine revolving ribs are present with wide inter- 

 spaces containing intervening striae. 



Dimensions. Altitude 110 mm. ; width of body whorl 19 mm. 



Occurrence. At locality 329 (University of Washington Palaeontological 

 Collection) at bend in Cowlitz River near Vader, Lewis County, Section 28, 

 Township 11 North, Range 2 West. 



OLSQUAHENS1S n. Sp. 



Plate XII, Figure 15 



Description. Shell large; whorls 14 or 15; sides of the whorls straight with 

 an abrupt, deep excavation just above the suture; suture linear; surface sculp- 

 tured with six, prominent revolving ribs which are equal in size and have inter- 

 spaces three times the width of the rib ; interspaces with fine, intervening striae ; 

 growth lines prominent, very convex, sloping from the suture at an angle of 25 

 as far as the middle portion of the whorl then passing to the suture below at an 

 angle of 30. 



Dimensions. Approximate altitude of shell 120 mm. ; width of lower whorl 

 16 mm. 



Occurrence. At locality 329 (University of Washington Palaeontological 

 Collection) at bend of the Cowlitz River near Vader, Lewis County, Section 28, 

 Township 11 North, Range 2 West. 



TURRITKU,A WASHINGTONIANA n. Sp. 



Plate XI, Figures 13, 14, 16 



Description. Shell medium in size and conical in outline ; whorls many, 

 straight to very slightly concave, sloping from the suture about four-fifths of 

 the length of the whorl to the base where it makes a sharp angle ; surface below 

 the angle beveled; suture moderately deep, appressed surface of the shell sculp- 

 tured with six, equal prominent revolving ribs on each whorl with interspaces 



