122 KANSAS UNIVERSITY QUARTERLY. 



Taiirrrdia bulbosa Whitf. Plate XXVIII, figs. 11, 12. 



Shell small, triangular in general outline. The beaks are promi- 

 nent, slightly incurved, subcentral, and project slightly beyond the 

 cardinal line. The anterior portion of the shell is marked by a broad, 

 shallow depression, which passes transversely across that portion of 

 the shell, expanding gradually as it approaches the dorsal margin. 

 The dorsal border is almost straight, but is rounded at the extremities. 

 The posterior and the anterior borders are both somewhat sharply 

 rounded. The surface of the cast is smooth, but exhibits tine con- 

 centric markings. 



Dimensions: Length, 20 mm.; width, 17 mm.; height, 4 mm. 



Cxeological horizon : The arenaceous nodules of stratum No. 13 

 contain numerous representatives of this species. Its associates are 

 the fossils already mentioned for that stratum. 



Locality : The Freeze-out Hills, Wyoming. 



Remarks : This species is somewhat abundant. The test is rarely 

 found, but the casts are numerous. 



rhutit hiiKji Meek. Plate XXIX, figs. 3, 6. 



Shell moderately large, expanding rapidly toward the posterior 

 margin. The test is of medium thickness, with a prismatic structure, 

 dark colored ; the pearly layer absent in the specimen. The dorsal 

 border is slightly concave in the central region, but convex in the 

 posterior region, in which region the ventral border is slightly con- 

 cave. The posterior margin of the shell is rounded and that portion 

 of the shell body is reflex. The surface has a prominent carina ex- 

 tending from the beak to the posterior margin, forming an angle, 

 which is slightly nearer the ventral than the dorsal border. The dor- 

 sal side of the angle is concave, while the ventral is convex. The 

 surface of the shell is ornamented by longitudinally radiating striae 

 extending in lines parallel with the borders, also by curved lines of 

 growth, which arise from the dorsal border. 



Dimensions: Length, 13 cm.; width, G cm.; height, 1 cm. 



Geological horizon : Pinna klngi occurs somewhat abundantly in 

 No. 13 of the section. It is found with Aslarte pacl^ardi, Belemnites 

 densus, Pleuromya compressa, Goniomya montanaensis, etc. 



Remarks: The above may be the same species as Pinna hreweri 

 Gabb, described from the Chico of California. This seems to be its 

 nearest connection, and a comparison of the forms will be necessary 

 to the positive identification of their relationshijjs. 



Pinna sp. Plate XXIX, figs. 1, 2. 

 The casts of several smaller, more convex individuals were discov- 

 ered associated with Pinna kingi. The surface ornamentation of the 



