352 SR! CAPPS. ik. 
considerable further study will be necessary for the proper working- 
out of this portion of the skeleton. 
The scapula resembles very closely that of Platecar pus ictericus,* 
being thinned and flattened above, with a truncate margin for carti- 
laginous attachment. Below, the bone is thickened for articulation 
with the coracoid and humerus. 
The coracoid also is remarkably like that of Platecarpus, the only 
essential difference being the less deep emargination. This species 
is referred with great certainty to Holosaurus abruptus by Williston 
after a careful examination of the type specimen in the Yale collec- 
tion—a specimen which he himself collected. The emargination of 
the coracoid is therefore proven to be an individual, and not a 
generic character. The close resemblance of the different elements 
of the skeleton to that of Platecarpus make it seem certain that this 
specimen must ultimately be referred to that genus, but there are a 
number of differences between this specimen and any described 
species of Platecarpus. The name Holosaurus abruptus will there- 
fore be used provisionally until the specimen is mounted and available 
for critical comparison. 
The ilium.—The ilium is a shaftlike bone, expanded proximally. 
From the relation in which the bones of the two sides were found it is 
evident that the vertebral end was approximated in life to the end of 
the transverse process of the third pygal vertebra, though evidently 
not attached to it. The relations of the bones, as found, also show 
that the ilium had a nearly vertical position. Proximally the bone is 
expanded and thickened, with a continuous facet for articulation 
with the ischium and pubis, and for the acetabulum. The bone 
resembles most closely that of Platecarpus. 
The ischium.—The ischium is a very broad, flat bone, laterally 
expanded at either end. The acetabular end has facets for articula- 
tion with the ilium and pubis, and an outwardly directed face for the 
acetabulum. Behind the acetabulum, and slightly separated from 
it, isa thin process with a roughened end for cartilaginous attachment. 
The shaft of the bone has a rounded, thickened ridge on its lower 
side, and is slightly concave above. The distal end has a very broad, 
thin lateral expansion in front. The shaft, at its thickened portion, 
1 University Geological Survey of Kansas, Vol. IV, p. 184. 
