14 University of Washington Publications in Geology [Vol. I 



Coal Creek from Mount Solo, Cowlitz County, Section 2, Township 8 North, 

 Range 3 West; locality 343 (University of Washington Palaeontological Collec- 

 tion) on Coal Creek about one-half of a mile above Inman-Polson shops, Cow- 

 litz County, Section 2, Township 8 North, Range 3 West; locality 320 (Univer- 

 sity of Washington Palaeontological Collection) on south bank of Stillwater 

 Creek below the graveyard about one and one-half miles from Vader, Lewis 

 County, Section 30, Township 11 North, Range 2 West. 



GENUS ANODONTA CUVIER 



ANODONTA ARNOLDI n. sp. 



Plate X, Figure 10 



Description. Shell large and rectangular in outline ; inequilateral, beaks 

 situated about one-third of the distance from the anterior end; beaks broad and 

 low ; cardinal line straight ; anterior end sloping from the dorsal line at an angle 

 of 30 for about one-third of the length of the anterior end, then broadly curves 

 into the ventral margin ; ventral margin straight and parallel with the dorsal line, 

 posterior end straight, broadly pointed at the ventral margin, extending at an 

 angle of 40 to the dorsal line ; an umbonal ridge extends from the beaks 

 obliquely to the posterior-ventral end, above which the region is concave ; surface 

 sculptured only with fine, concentric lines of growth ; shell thin and fragile ; inner 

 layer of shell nacreous. 



Named in honor of Dr. Ralph Arnold. 



Dimensions. Length 43 mm.; height 23 mm.; thickness 11 mm. 



Occurrence. At locality 315 (University of Washington Palaeontological 

 Collection) at dam just below the railroad bridge on west bank of Olequah Creek, 

 about one-third of a mile below its junction with Stillwater Creek, near Vader, 

 Lewis County, Section 32, Township 11 North, Range 2 West. 



GENUS LIMA BRUGUIERE 



LIMA PACKARDI n. sp. 

 Plate VIII, Figure 13 



Description. Shell small; obliquely oval in outline; inequilateral; beaks 

 minute; posterior dorsal margin straight, sloping only slightly from the beaks; 

 posterior end slopes roundly from the dorsal line at an angle of 40, passing below 



