182 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Sb«. 



Patella subquadrata, new species 

 PI. 31, Figs. 13a and 13b 



Shell of moderate height, broad, marked by low rounded, 

 obscure radial ribs with shallow interspaces only half as wide 

 as ribs ; apex two-fifths of shell length from anterior. 



This form is fairly abundant at its type locality. 



Dimensions: — Length, 6.5 mm. ; height, 3.5 mm. 



Type: — No. 440, 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. 



