46 KANSAS UNIVERSITY QUARTERLY. 
Radius. 
The radius is a much more slender bone than the ulna, its ex- 
tremities not as much dilated. In a specimen compressed laterally 
the proximal end shows a deep pully-like articulation, divided by 
a ridge in the middle. At the distal extremity it is more expanded 
than proximally, with a single articular facet, and an expanded, 
non-articular radial margin. 
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Carpus. 
The carpus has three bones. By reason of the constant com- 
pression and distortion to which they are subjected, it is difficult to 
recognizably describe them. The proximal bone is the largest, 
and has two facets on the proximal surface for articulation with 
radius and ulna. The lateral carpal, the smallest, is sub-triangu- 
lar or sub-quadrangular in shape, with an oval or rounded facet on 
the proximal end, and another, smaller, near the distal end, form- 
a 
ing an emargination on the border. A good figure of this bone is 
3. ‘*Professor Marsh finds 
given by Cope. Cret. Vert., p. vil, fig. 
the carpus to have the same structure in the toothless Ornithosaurs 
from Kansas (as in Ornithocheirus) and discussed it fully in April, 
1882 (Am. Jour. Sci.), though without mentioning memoirs in 
which the structure has been figured, and from which the interpre- 
tation appears to have been taken.’’* 
Measurements: 
Greatest diameter of proximal carpal, as compressed..75 mm. 
Greatest diameter oflatenalicar pal iit visas wn taco cat 
Metacarpals. 
The first metacarpal or Pteroid, has a proximal expansion and 
articular surface, for union apparently with the distal articular 
surface of the iateral carpal. It terminates ina free, pointed distal 
end. One or two small ossicles, oval in shape, are found with the 
carpal bones. They are probably sesamoid bones. ‘The three fol- 
lowing metacarpals are slender splint bones about one-third of 
the length of the wing metacarpal. Professor Marsh has des- 
cribed the second as being thread-like proximally. They all ter- 
minate in an expanded end, which is curved outward and has 
a rounded articular surface for the phalanges. The phalanges 
