1922] Fauna from the Eocene of Washington 29 



whorl ; body whorl rounded ; aperture elliptical ; outer and inner lip finely dentate ; 

 callus large ; surface with microscopic, spiral lines covered by dark brown, spiral 

 stripes. The original coloration of the bands is preserved in part and their con- 

 tour suggests that they would apparently extend regularly over the surface of 

 the body whorl without a zigzag or wavy pattern. 



Dimensions. -Altitude 3 mm. ; width of body whorl 3.75 mm. 



Occurrence. At locality 329 (University of Washington Palaeontological 

 Collection) at bend of the Cowlitz River, near Vader, Lewis County, in Section 

 28, Township 11 North, Range 2 West. 



GENUS PYRAMIDETXA LAMARCK 



SUBGRNUS SYRNOLA ADAMS 



PYRAMIDEXLA (Syrnola) VADERENSIS n. sp. 



Plate XI, Figures 16, 17 



Odostomia new species Dickerson, 1915, Proc. Cal. Acad. Sci., vol. V, No. 3, pi. 

 5, fig. 10 a, b. 



Description. Shell small, slender and thin with a maximum; of ten whorls 

 which have nearly flat surfaces; suture very distinct; surface smooth except for 

 numerous, very faintly developed lines of growth ; base of body whorl ornamented 

 by six very narrow, moderately deep, revolving grooves which do not extend up- 

 on the upper surface of the whorl; aperture entire, semi-ovate and narrow pos- 

 teriorly but broader and rounded anteriorly. The columella is characterized by 

 having one fold; outer Jip with two or three internal, spiral ribs. These do not 

 appear to be present on the young shells. 



This species bears a resemblance to Odostomia packi Dickerson but differs 

 from that form in having a lesser number of whorls, one columella plait and in 

 the absence of the strong, spiral lines on the body whorl as is shown in the illus- 

 tration of packi. 



This shell was found to be quite abundant at locality 329. A specimen from 

 the same locality was figured but not described by Dr. Dickerson. In size and 

 shape this species is like the one previously figured by Dickerson. Since it is from 

 the same locality there is little question as to its identity. 



Dimensions. Altitude 8 mm. ; width of body whorl 2.25 mm. ; apical angle 

 15. 



Occurrence. At locality 329 (University of Washington Palaeontological 



