46 University of Washington Publications in Geology [Vol. 1 



ribs there are well defined revolving threads; these ribs are crossed by strongly 

 marked lines of growth. Canal elongated and slightly curved; aperture narrow. 



Dimensions Altitude of shell 40 mm. ; altitude of spire 5 mm. ; maximum di- 

 ameter of shell 32 mm.; angle of spire 98. 



Occurrence At locality 229 (University of Washington Palaeontological Col- 

 lection) in shaly sandstone in the east bank of Wynooche River one half mile 

 below the mouth of Bitter Creek in Section 35, Township 18 North, Range 8 West. 



Horizon Lower Miocene; Area montereyana Zone. 



FlCUS CHEHALISENSIS n. Sp. 



Plate V, Figure 84 



Description Shell small and pyriform; spire low; whorls four; surface of 

 whorls smooth except for numerous closely spaced somewhat indistinct lines of 

 growth; revolving ribs or angles are absent; on upper margin of body whorl just 

 below suture there is a' slightly impressed groove. Aperture semi-lunar and elon- 

 gated ; canal elongate and slightly deflected outwards. 



Dimensions Altitude of shell 17 mm.; altitude of spire 3 mm.; maximum diam- 

 eter of shell 7 mm.; angle of spire 112. 



Occurrence At locality 229 (University of Washington Palaeontological Col- 

 lection) in shaly sandstone in the east bank of Wynoochee River one half mile 

 below mouth of Bitter Creek in Section 35, Township 18 North, Range 3 West. 



Horizon Lower Miocene; Area montereyana Zone. 



GENUS NASSA LAMARCK 



NASSA CHEHALISENSIS n. sp. 

 Plate V, Figures 69 and 70 



Description Shell small and elongate-ovate; whorls five in number and con- 

 vex; suture impressed; surface of body whorl ornamented with thirty equally 

 spaced revolving ribs which are crossed by ten equally developed longitudinal 

 ribs; as a result the surface has a recticulated appearance; aperture narrow; outer 

 lip thick and inner surface crenulated; inner lip slightly callused; columella short 

 with no sulcus at anterior end. 



Dimensions Altitude of shell 13 mm.; altitude of spire 6 mm.; maximum 

 diameter of shell 5 mm.; angle of spire 45. 



Occurrence At locality 230 (University of Washington Palaentological Col- 

 lection) in sandy shale in railroad cut two miles south of the junction of the North 



