1916] Weaver: Tertiary Faunal Horizons 47 



River branch of the Chicago, Milwaukee & St. Paul Railway with the main Grays 

 Harbor branch, in Section 27, Township 17 North, Range 8 West. 



Horizon Lower Miocene; Area montereyana Zone. 



GENUS CHRYSODOMUS SWAINS 



CHRYSODOMUS LINCOLNENSIS n. sp. 



Plate V, Figure 86 



Description Shell of medium size; spire short; whorls six; suture distinct 

 but not channeled; all the whorls are angulated and upon the angles are small 

 nodes; body whorl large and somewhat elongate; a prominent angulation exists 

 upon it just above the middle portion; between this angulation and the suture the 

 upper surface is very slightly concave and merges into the lower surface of first 

 whorl of spire as a continuous surface so that the suture appears merely as a line; 

 middle and lower portion of body whorl evenly rounded; surface sculptured by 

 prominent revolving ribs ; there are four of these on the upper surface of the 

 whorl, three on the middle portion and eleven below ; between the ribs are broad 

 flat interspaces three times the width of the ribs ; within the interspaces are set 

 one to three fine revolving threads ; the revolving ribs are crossed by fifteen longi- 

 tudinal ribs which are well developed on the middle portion of each whorl but 

 become somewhat obscure on the upper surface and entirely disappear on the 

 lower; where these cross the angulated areas somewhat flattened nodes are pro- 

 duced; very minute nodes are present upon the more prominent revolving ribs on 

 the middle portion of the shell. Outer lip thick but smooth ; inner lip heavily 

 callused; callus extends out some distance on to the surface of the body whorl; 

 but is so thin that the sculpture of it shows plainly through. Canal twice as long 

 as spire and slightly reflexed at anterior end; moderately deep and faintly chan- 

 neled. 



Dimensions Altitude of shell 12 mm.; altitude of spire 5 mm.; maximum 

 diameter of shell 5 mm.; angle of spire 50. 



Occurrence At locality 256 (University of Washington Palaeontological 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. 



CHRYSODOMUS PACKARD, n. sp. 

 Plate IV, Figures 57 and 58 



Description Shell small, thick and elongate-ovate; whorls five to six in num- 

 ber, tabulated and ornamented with both revolving and longitudinal ribs; there is 

 a prominenet angle near the upper portion of each whorl; surface above angle 



