288 REVIEWS 
which have been differentiated into ten formations, of which only one, 
the Hunton, has been fully studied. 
The structure of the Arbuckle Mountains consists of two sets of 
complex folds that intersect each other at almost right angles, forming 
pitching anticlines, synclines, domes, and basins. These have been 
considerably affected by subsequent erosion and normal faulting. 
The economic resources of the Arbuckles have been but little utilized. 
They consist of iron and manganese, among metallic minerals, and of 
extensive bodies of asphalt, glass sand, cement materials, building stone, 
sand, gravel, etc., of the non-metallics. A; E: F. 
‘““Osteology of Pteranodon.”” By GrEorGE F. Eaton. Memoirs of 
the Connecticut Academy of Arts and Sciences, II (1910), pp. 
1-30,) Elssan, 
The writer, whose acquaintance with vertebrate paleontology began 
with the collection of a specimen of Pteranodon, takes especial pleasure 
in the expression of his appreciation of the present memoir by Dr. Eaton. 
The rich material of this genus in the Yale collections is unsurpassed, 
and it has been well utilized in the present paper, with its large number 
of excellent illustrations. Nearly every important point in the osteol- 
ogy of these remarkable creatures has now been conclusively determined, 
and of all nothing is more anomalous than the structure of the palate, 
which as figured and described by the author (and the writer can testify, 
correctly) seems inexplicable for a vertebrate. The extraordinary occip- 
ital crest justifies Marsh’s original figures, though the author finds in 
other specimens or species a shorter crest as figured by Williston; and 
it is also another evidence of that peculiar osteological acumen possessed 
by Marsh which has seldom been excelled among paleontologists. One 
could wish that Dr. Eaton had entered more fully into some of the 
disputed points about the relationships and characters of the genus, 
but the omissions are immaterial in comparison with what he has given. 
S. W. W. 
