56 University of Washington Publications in Geology [Vol. 1 



GENUS SCAPHANDER MONTF. 



SCAPHANDER WASHINGTONENSIS n. sp. 



Plate V, Figure 68 



Description Shell ranging from small to moderate in size for the genus and 

 somewhat elongate ; posterior end slightly attenuated ; apex imperf orate ; outer lip 

 produced considerably above it; aperture moderately broad at posterior end but 

 much more so at anterior; all specimens of the species show a very well defined 

 callus on the inner lip as well as on the anterior end of the canal; outer lip re- 

 flected completely back upon itself; pillar arcuate; surface of shell ornamented by 

 sixty to sixty-five flat topped revolving ribs; the interspaces averaging about 

 the same width on the posterior half of the shell but on the anterior half become 

 only half as wide. 



Dimensions Altitude of shell 17 mm.; maximum diameter of shell 10 mm. 



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 26. Township 15 North, Range 3 West. 



Horizon Lowermost Oligocene; Molopophorus lincolnensis Zone. 



