54 University of Washington Publications in Geology [Vol. 1 



TURRIS DICKERSONI n. Sp. 



Plate V, Figure 66 



Description Shell small and elongate ; whorls ten in number and angular ; 

 spire elevated and conical; upper surface of whorls concave and ornamented by 

 very faintly developed revolving ribs ; a prominent keel is developed upon the 

 angulated portion of each whorl and this is sculptured by three rounded ribs with 

 interspaces of equal width ; about thirty similar ribs are present on the lower sur- 

 face of the body whorl ; longitudinal sculpture represented by moderately devel- 

 oped lines of growth which conform to the posterior sinus. Aperture sub-pyriform ; 

 outer lip thin ; inner lip callused wi h a noticeable groove separating the callus 

 from ornamented portion of the whorl ; canal of moderate length ; deeply channeled 

 and nearly straight. 



Dimensions Altitude of shell 18 mm.; altitude of spire 10 mm.; maximum 

 diameter of shell 7 mm.; angle of spire 35. 



Occurrence At locality 256 (University of Washington Paleontological Col- 

 lection) in railway cuts on the O.-W. R. R. & N. Co. one fourth mile northwest 

 of Lincoln Creek Station in Section 27, Township 15 North, Range 3 West. 



Horizon Lowermost Oligocene; Molopophorous lincolnensis Zone. 



TURRIS THURSTONENSIS n. sp. 

 Plate V, Figures 79 and 80 



Description Shell small and moderately elongated with seven whorls, all of 

 which are ornamented; there are three revolving folds upon the body whorl; 

 posterior surface of whorls at suture nearly at right angles to axis of spire; middle 

 portion of surface nearly at right angles to posterior surface and forming a sharply 

 angulated ridge ; from this ridge the surface is slightly concave to the broadly 

 rounded middle angle of whorl; between the middle and anterior angles there is 

 a narrow flat surfaced groove containing a single faint revolving rib ; anterior 

 surface of whorl sculptured by ten poorly defined revolving ribs and interspaces 

 of equal width; longitudinal ribs are absent with the exception of wavy lines of 

 growth which conform to the curvature of the posterior sinus. Aperture moderately 

 elongate and slightly wider posteriorly than, anteriorly; anterior end opens in 

 form of a wide but slightly twisted canal; outer lip smooth; inner lip very slightly 

 callused and containing a well defined axial groove extending from the end of 

 the canal to the posterior end of the aperture; the surface of the whorl extends up 

 sharply to and terminates at the groove. 



Dimensions Altitude of shell 17 mm.; altitude of spire 11 mm.; maximum 

 diameter of shell 6 mm.; angle of spire 35. 



Occurrence At locality 256 (University of Washington Palaeontological Col- 



