APPENDIX. 
Art. L.—Principal Characters of American Pterodactyls ;* 
by Professor O. C. Marsu. 
responding facet of the opposite scapula by a thin. median plate, 
which is apparently a neural spine of a dorsal vertebra. The 
foot of a bat whict orts the patagium. The first three 
| oacy ey and do not reach 
the carpus. At their distal end they supported sharp, curve 
claws. In some species, the distal phalanx of the wing finger 
The pelvis in Pteranodon is of moderate size. The ilia are elon- 
gate, and the acetabulum is imperforate. The ischia are broad, 
and united on the median line. The tail is short and slender, 
and the distal caudals are sometimes coossified. The posterior 
limbs are well developed. The tibia has at 1ts distal end a 
‘Pulley-like articular surface. There are two tarsal bones o 
* Abstract of a paper read before the American Association for the Advance- 
Ment of Science, at Buffalo, Aug. 28th, 1876. 
t This Journal, vol. xi, p. 507, June, 1876. 
