1922] Fauna from the Eocene of Washington 15 



into the ventral margin at about the same angle ; ventral margin curved, rounding 

 more sharply into the anterior end ; anterior end straight, extending at an angle 

 o^ 60 with the cardinal line and extending directly from the anterior margin of 

 the beaks; no anterior ear present; surface sculptured with numerous fine 

 radiating ribs which on the posterior end of the shell have interspaces that are 

 nearly equal in width to the rib, the ribs become broader on the middle portion 

 of the shell with the interspaces about one-fourth of the width of the rib. 



Named in honor of Dr. E. L. Packard, professor of Geology, University of 

 Oregon. 



Dimensions. Height 10 mm. ; width 7 mm. 



Occurrence. At locality 324 (University of Washington Palaeontological 

 Collection) in the west bank of Olequah Creek about one-eighth of a mile north 

 of Vader, Lewis County, Section 29, Township 1 1 North, Range 2 West. 



GENUS MYTILUS LINNEAUS 



MYTILUS sfitjvWATERENsis n. sp. 



Plate IX, Figure 13 



Description. Shell medium in size; outline subquadrate, convex; dorsal 

 margin slightly rounded ; anterior margin nearly straight ; posterior end rounded, 

 inflated at the ventral side; ornamentation consisting of coarse, radiating ribs 

 with narrow interspaces; on the umbonal slope and along the dorsal margin 

 many of the ribs bifurcate. 



Dimensions. Length 22 mm. ; width 16 mrn. ; thickness 10 mm. 



Occurrence. At locality 319 (University of Washington Palaeontological 

 Collection) McClarety ranch on south bank of Stillwater Creek, one mile west of 

 Vader, Lewis County, Section 30, Township 1 1 North, Range 2 West. 



GENUS MODIOLUS LAMARCK 

 SUBGKNUS BRACHYDONT3S SWAINSON 



MODIOLUS (Brachydontes) OLEQUAHENSIS n. sp. 

 Plate IX, Figures 3, 17 



Description. Shell median, elongate; posterior end obliquely produced; 

 hinge line straight and long ; ventral margin sloping broadly and obliquely to the 



