1922] Fauna from the Eocene of Washington 33 



This shell is very much like the figure of Naticina obliqua Dickerson, both 

 in size and sculpture. N. obliqua Gabb is figured as much too elevated to be 

 either our specimen or that from the California collection of Washington material. 

 There is no tendency shown on S. occidentis for alternation in size of the spiral 

 ribs as described by Gabb. 



Dimensions. Altitude 8 mm.; length of body whorl 15 mm.; width of body 

 whorl 12 mm. 



Occurrence. At locality 319 (University of Washington Palaeontological 

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

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



GENUS HYDROBIA HARTMANN 

 HYDROBIA PONTIS n. sp. 

 Plate XI, Figures 9, 11 



Description. Shell small and fragile ; sub-conic ; whorls about six, regularly 

 increasing ; suture distinct ; whorls angulated medially, the upper portion of the 

 whorl sloping at an angle of 45, the lower half of the whorl at an angle of 20 ; 

 growth lines prominent, crossed by fine, revolving striae, of which the medial 

 are the most pronounced; the shell has a nacreous luster; aperture ovate or 

 quadrate; umbilicus minute. 



This little shell is very abundant, occurring in masses in a coarse sandstone. 



Dimensions. Altitude 9 mm. ; width of body whorl 4 mm. 



Occurrence. At locality 315 (University of Washington Palaeontological 

 Collection) at dam just below the railroad bridge at Vader, Lewis County, on 

 the west bank of the Olequah Creek, about one-third of a mile below its junction 

 with the Stillwater, Section 32, Township 11 .North, Range 2 West. 



GENUS TURRITELLA LAMARCK 



TURRITEU.A UVASANA CONRAD VAR. 



Plate XII, Figure 17 



Turritella uvasana Conrad, 1885, Pac. R.R. Rept, Vol. 5, p. 321, pi. II, fig. 12. 

 Turritella uvasana Gabb, 1864, Geol. Sur. Cal. Pal, Vol. I, p. 134, pi. 21, fig. 92. 



Original Description. "Subulate, \vhorls with the sides straight and oblique above, 



