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



Dimensions : — Length of the type specimen, 50 mm. ; alti- 

 tude, 48 mm. ; thickness, 38 mm. 



Occurrence : — Lower Miocene, or possibly Oligocene, of 

 northwestern Oregon and western Washington. The type was 

 obtained from the bluffs at the west end of the railroad tunnel 

 about three miles southeast of Timber, Oregon. 



This species can be easily distinguished by its peculiar radial 

 sculpture. A number of species of Cardhim from the west coast 

 of North America have less prominent sculpture on the pos- 

 terior dorsal area than on the remainder of the surface. In 

 this species the reverse is true. 



Type: — No. 113, and cotype No. 114, Cal. Acad. Sci., from 

 bluffs at the west end of the railroad tunnel about three miles 

 southeast of Timber, Oregon. Coll., Bruce Martin. 



Named in honor of Professor Charles E. Weaver, University 

 of Washington. 



Genus CHIONE 



Chione panzana, new species 



Plate 1, figures la and lb 



Shell large, heavy, subtriangular in outline; valves equal, 

 inequilateral, convex, inflated; beaks elevated, turned inward 

 and forward, about one-third the length of the shell from the 

 anterior extremity; umbones full; lunule large, cordate, de- 

 pressed, sculptured by numerous fine concentric lines, bordered 

 by a narrow groove; escutcheon lanceolate, extending almost 

 to the posterior extremity, crossed by the concentric sculpture ; 

 posterior dorsal slope arcuate ; anterior dorsal margin strongly 

 excavated in front of the beaks; extremities rather sharply 

 rounded ; base arcuate, crenulated within ; surface marked by 

 numerous strong, concentric ridges, somewhat irregularly 

 spaced, and many small radiating ribs which are a little less 

 conspicuous than the concentric ridges : hinge plate heavy, with 

 three cardinal teeth, the middle one bifid. 



Dimensions : — Length, 78 mm. ; altitude, 69 mm. ; thickness 

 of single valve, 22 mm. 



Occurrence : — Lower Miocene of northeastern San Luis 

 Obispo County, California, the type from locality 53. 



