376 University of Kansas Geological Survey. 



elongate, slightly expanded, and rugose at the extremities, for 

 ligamentous attachments. The two processes join each other at 

 an angle of ninety degrees. The scapular process is about one- 

 third longer than the proscapula and is a little thicker. Plate 

 lxxx, figure 1. 



The coracoid is comparatively short, being less in length than 

 the scapula proper. It presents an expanded end, divided 

 into a scapular and a humeral face. The latter is the larger, 

 equaling in size the humeral face of the scapula. The glenoid 

 surface as a whole is large, wide open, and shallow. Behind 

 the head, the shaft of the bone becomes contracted and then 

 gradually expands to a broad, spatulate extremity, marked by 

 rugose striae. The shortness of the bone and its broad distal 

 extremity are its characteristic features. Plate lxxx, figure 2. 



The humerus is represented by a fragment of the proximal end 

 only of a large specimen, which shows that it was not divided 

 into two parts, one for the head and the other for muscular at- 

 tachment, as in Protostega and the existing sea turtles, but was 

 covered by a single articular surface, which is broader on the 

 inner side. The same feature is shown in a nearly perfect 

 humerus of a smaller specimen. Plate lxxxi, figures 3, 6, 7. 



The radius and ulna are unknown. The front foot, or manus, 

 as shown by a few bones from this region, was modified to form 

 an elongate flipper, with short carpus and long, slender digits, 

 much as in the modern loggerhead turtle. Plate lxxxii, fig- 

 ures 1, 2. 



The pelvis is represented by the ilia and a single ischium. 

 The ilium is a strong bone, indicating an animal of considerable 

 size. The proximal end shows three faces, two for the ischium 

 and pubis^ and the third for a part of the acetabulum. The 

 first two are nearly equal in size, meet at an obtuse angle, and 

 are separated from each other by a sharp ridge. The acetabular 

 face lies on the outer side of the bone, nearer the posterior than 

 the anterior side. The ridge that separates the ischial and 

 pubic faces meets a little in front of the middle of the inner 

 border of the face. The iliac face shows that the acetabulum 

 was nearly circular in outline and moderately deep ; the rim is 



