Geological Papers. 183 



This species differs from the other Venus species obtained in its 

 short, robust, gibbous shape. 



The specimen described is from the lower series at East Clallam; 

 it is the only specimen of the species found. 



13. Venus (Chione) clallamensis n. s. Plate I, fig. 13. 



Shell ovate to subtriangular in outline; beaks considerably 

 anterior to center, incurved; lower margin rounded to subarcuate 

 in old specimens; posterior margin produced to an angle; hinge 

 margin straight; surface ornamented with radiating ribs and con- 

 centric ridges (shown on a fragment of the shell); ribs flat, some 

 very fine, others much thickened, formed by the coalescing of two 

 or more smaller ones; ribs coalesce towards the beak, or to proceed 

 from beak toward the base they may be said to be dichotomous; 

 concentric ridges not flattened or ruffled; the concentric ridges 

 show impressions on the casts. 



Dimensions of largest specimen obtained: Length (2 inches) 

 52 ; alt. (1.8 in.) 48; from apex of umbones to posterior extremity, 

 52; to anterior extremity, 25; from posterior to anterior extremity, 

 following the base-line, 58. Of a medium-sized specimen: L. (1.75 

 in.) 45; alt. (1.56 in.) 40; thickness (0,89 in.) 22; from apex of 

 umbo to posterior extremity, 43; to anterior extremity, 22. Of a 

 third specimen: L. (1.5 in.) 38; alt. (1.25 in.) 35; from apex of 

 umbones to posterior extremity, 35.5; to anterior extremity, 22. 



Measurements of Mr. Anderson's type specimen of V. ( Chione) 

 temblorensis were as follows: "2| inches in larger diameter, and 

 thickness 2| inches."** 



Distinguishable from V. {Chione) temblorensis Anderson by 

 more anterior beaks, dichotomous ribs, the coalescing of some of 

 the ribs and the variableness in the size of the same, and in the 

 shells being less gibbous. 



Shell found in all three horizons at East Clallam. 



Subfamily Tapetin^; Genus Saxidomus Conrad. 



Shell transversely oval, inequilateral, solid, ventricose; without 

 iunule; umbones tumid; teeth three or four, inequal, narrow, cen- 

 tral one bifid; ligament very thick, elongated; muscular impres- 

 sions oval or rounded, nearly equal; pallial sinus large, elongated. 

 Saxidomus nuttallii Con. is the type. (After Arnold.) 



44. Anderson. Gal. Acad. Sci., Geol. 3d ser., vol. II, No. 2, p. 196. 



