Vol. VII] DICKERSON— CLIMATE AND OLIGOCENE FAUNAS 175 



axial ribs intersecting these various spiral lines making nodes 

 at crossings; canal long, straight; inner lip slightly incrusted. 



Type: — No. 413, Cal. Acad. Sci. Locality 181, near Vader, 

 Lewis County, Washington, on east bank of the Cowlitz River, 

 just back of the Greeco ranch house, about four miles east of 

 Vader. Colls., F. M. Anderson and Bruce Martin. 



Dimensions: — Length, 24 mm.; width of body-whorl, 12 

 mm. 



Named in honor of William Gabb, pioneer paleontologist of 

 California. 



Cerithiopsis howardi, new species 

 PI. 30, Figs. 6a and 6b 



Shell elongate-conic with 11 whorls, the first three smooth 

 nuclear; fourth, fifth, sixth and seventh whorls decorated by 

 12 axial ribs crossed by three spiral lines, the uppermost being 

 the weakest ; rounded nodes at crossings ; eighth whorl similarly 

 decorated except that the uppermost spiral line is equal in 

 strength with other two ; ninth, tenth and eleventh whorls, ex- 

 hibiting two more weaker spiral lines bordering upper and 

 lower sutures, which are impressed and slightly wavy; base 

 smooth ; outer lip, thin, sharp ; canal very short, nearly straight. 



Dimensions: — Length of type, 7 mm. 



Type:— No. 415, cotype 416, Cal. Acad. Sci. Locality 181, 

 near Vader, Lewis County, Washington, on east bank of the 

 Cowlitz River, just back of the Greeco ranch house, about four 

 miles east of Vader. Colls., F. M. Anderson and Bruce Martin. 



Named in honor of Delle Howard Dickerson, whose constant 

 aid has enabled the writer to do this work. 



Epitonium merriami, new species 



PI. 30, Figs. 7a and 7b 



Shell medium in size; number of whorls unknown; apical 

 angle small, suture, sharp, distinct, linear ; each whorl is dec- 

 orated by three strong spiral lines crossed by about 20 axial 

 ribs parallel to axis; pits between the two ribbing systems 

 rectangular, with shorter dimensions parallel to axis; split 

 rectangles occurring above and below suture. 



