1918] Fan Winkle: Paleontology of the Oligocene 87 



Occurrence At locality 330 (University of Washington Paleontological Col- 

 lection) situated at the Greece ranch, four miles east of Vader, on the east bank of 

 Cowlitz River, in Section 25, Township 11 North, Range 2 West. 



Horizon Lower Oligocene; lower phase of Molopophorous lincolnensis Zone. 



GENUS TURRITELLA LAMARCK 



TURRITELLA WEAVERI n. sp. 



Plate VII, Figure 14 



Description Shell minute, elongate and thin; whorls seven and slightly con- 

 vex; suture sunken in a deep groove the larger part of which groove lies imme- 

 diately above the suture line. The lower portion of the surface of each whorl is 

 decorated with two very pronounced revolving ribs with interspaces of double width 

 but containing no intervening threads; upper half of each whorl decorated with 

 two similar but less well developed revolving ribs and interspaces. Longitudinal 

 sculpture is absent except for numerous lines of growth; aperture oval; outer lip 

 thin; inner lip slightly calloused. 



Dimensions Altitude of shell 2.5 mm.; altitude of spire 1.5 mm.; maximum 

 diameter of shell 1 mm.; angle of spire 35. 



Occurrence At locality 330 (University of Washington Paleontological Col- 

 lection) situated at the Greece ranch, four miles east of Vader, on the east bank of 

 Cowlitz River, in Section 25, Township 11 North, Range 2 West. 



Horizon Lower Oligocene; lower phase of Molopophorous lincolnensis Zone. 



GENUS CERITHIOPSIS FORBES 



CERITHIOPSIS FASTENI n. sp. 



Plate VII, Figure 8 



Description Shell minute, slender and elongate; whorls eight in number and 

 decorated with twelve very prominent longitudinal ribs which extend over the 

 surface of all the whorls; these are crossed by four broad, well defined revolving 

 ribs with interspaces of double width; within each interspace there is a single 

 revolving thread. At the intersection of the longitudinal and revolving ribs are 

 rounded moderately prominent nodes; suture distinct with a fine revolving cord 

 immediatel yabove it; lower end of the middle portion of the body whorl merges 

 at a sharp angle into a nearly flat base, which is decorated with four revolving 

 ribs; aperture roughly oval in outline; canal short and incised. 



