182 Kansas Academy of Science. 



teriorly; cardinal margin sloping rapidly but slightly convex; base 

 broadly rounded; surface sculptured by numerous frills and nu- 

 merous fine, crowded, radiating lines ; interior of valve not seen. 



Classification made by comparing specimens with specimens in 

 the museum of the Leland Stanford Junior University. 



The shells obtained differ from C. mathewsonii Gabb in that 

 Gabb's shell lacks the sculpture. 



Dimensions of largest specimen obtained : Length, 78 ; alt., 60. 



The specimens were obtained from the lower Pliocene at Quil- 

 layute. Wash., in which formation they seem to be rare. A much- 

 broken specimen was also found in the upper series of the Oligo- 

 cene-Miocene formation at Gettysburg. 



Specimen figured is from the Quillayute formation. 



Miocene (?) of California (Gabb). 



Upper Pliocene: Capitola, Cal. (Arn.old). 



Lower Pliocene : Quillayute, Wash. (Reagan). 



Oligocene-Miocene : Gettysburg, Wash. (Reagan). 



11. Venus (Chione) temblorensis Anderson. Plate I, fig. 11. 



Venus {Chione) temblorensis Anderson, Cal. Acad. Sci., 3d ser., Geol., vol. 

 II, No. 2, p. 196. 



Anderson's description:*^ "Shell subtriangular in outline; beaks 

 slightly incurved; lower margin rounded; hinge margin rather 

 straight ; surface ornamented with concentric ridges and radiating 

 ribs, the ridges rising in gently fluted and ruffled folds." 



Dimensions: Lat., 55; alt., 52. 



The specimen figured was obtained from the upper series of the 

 Clallam formation at Gettysburg, Wash., the only specimen of this 

 species obtained. 



Lower Miocene: Beds of Kern river and Temblor, California 

 (Anderson). 



Upper Oligocene-Miocene: Gettysburg, Wash. (Reagan). 



12. Venus (Chione?) olympidea n. s. Plate I, fig. 12. 



Description from a cast: Specimen medium-sized, suboval, con- 

 vex to gibbous; surface ornamented with fine to coarse concentric 

 lines of growth (judging from a few small fragments of the shell); 

 beaks large, high, anterior, terminal, pointed forward; lunule area 

 large; hinge robust; posterior muscular impression deep, circular; 

 pallial sinus deep, small, triangular; pallial line deep, continuous: 



Dimensions: Lat., 37; alt., 37.5; diam , 27.5; from beak to poste- 

 rior extrpmity, 37; to anterior extremity, 21. 



43. Loc. cit. 



