172 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Chama pacifica, new species 

 PI. 29, Fig. 10 



Shell rugose, robust, nearly circular in outline, the height 

 axis being but slightly greater than length ; hinge plate heavy, 

 arcuate; dentition obscure; irregular squamose incremental 

 lines decorating the shell. 



Dimensions: — Height of imperfect type, 14.5 mm. 



Type: — No. 399, 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. 



Lima bella, new species 

 PI. 29, Fig. 11 



Shell small with thin shell substance ; ventral margin acutely 

 rounded; posterior margin straight, sloping steeply from nar- 

 row straight hinge line; anterior margin broadly arcuate; very 

 fine radial ribs decorating shell. 



Dimensions: — Height, 9 mm. ; length, 6 mm. 



Type: — No. 400, 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. 



Actaeon parvum, new species 

 PI. 29, Figs. 12a and 12b 



Shell small, number of whorls probably five; body-whorl 

 cylindrical ; decoration consisting of about 20 flat equally spaced 

 spiral lines with peculiarly pitted interspaces; outer lip thin; 

 inner lip slightly incrusted; aperture, narrow above, elongate 

 and widened below. 



Dimensiojis: — Length of broken type, 6 mm. 



Type:— 'No. 401, cotype No. 402, 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. 



