1916] Weaver: Tertiary Faunal Horizons 51 



Occurrence From shaly sandstone in east bluff of Wynoochee River one-half 

 mile below mouth of Bitter Creek in Section 33, Township 18 North, Range 8 

 West. At locality 229 (University of Washington Palaeontological Collection). 



Horizon Lower Miocene; Area montereyana Zone. 



CANCELLARIA WASHINGTONENSIS n. sp. 

 Plate V, Figures 77 and 78 



Description Shell small and thin with six very strongly tabulated whorls ; 

 spire moderately high; whorls angulated a short distance below suture; upper slope 

 of whorl makes an angle of 110 with lower portion and is nearly at right angles 

 to axis of spire; surface of upper slope nearly flat and sculptured by six nearly 

 flat topped moderately developed revolving ribs ; between these are somewhat 

 wider interspaces each of which is set within a minute revolving thread ; on the 

 angulated portion of whorl there are three closely set revolving ribs a little better 

 developed than those on the surface above; on the surface below the angle 

 there are twenty revolving ribs with interspaces of double width and each set with 

 a fine revolving thread; twenty- four moderately developed longitudinal ribs cross 

 the revolving ribs; these are distinct over the entire surface of the whorls except 

 above the angle and below the suture; aperture elongate-elliptical; posterior end 

 of aperture truncated giving a sub-rectangular outline; outer lip thin and smooth; 

 inner lip slightly callused; plications are absent on the collumela; canal of mod- 

 erate length, slightly reflexed and with a small anterior sulcus . 



Dimensions Altitude of shell 1 1 mm. ; altitude of spire 5 mm. ; maximum di- 

 ameter of shell 6 mm. ; angle of spire 54. 



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. 



GENUS EXILIA 



ExiLIA LINCOLNENSIS n. Sp. 



Plate IV, Figures 49 and 50 



Description Shell large, slender, fusiform and having nine and one-half to 

 ten whorls; spire high and apex very acute; whorls moderately angulated, the 

 angle being situated about one-third the length of the whorl from the suture; on 

 the body whorl there is developed a very faint angle on the middle of the lower 

 half; the surface of the middle of the whorl between the upper and lower angles 

 is very slightly concave ; surface of whorl between posterior angle and suture is very 

 convex; suture distinct; shell ornamented by eleven longitudinal ribs 



