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36 KANSAS UNIVERSITY QUARTERLY. 
proposed a new order for these pterodactyls, baesd upon the 
absence of the teeth, but, as has been already shown for the orders 
of Ichthyosaurs and Birds based upon the same character, it is of 
subordinate value. Of course it is not yet certain that a perfect 
knowledge of the European species of Ornithostoma may not reveal 
generic characters to distinguish them from the American, but it is 
very doubtful, and the assumption that they are different, in the 
face of so much and direct evidence of identity, is unscientific. In 
Kansas rocks the genus is persistent in time, the species O. 
ingens reaching through nearly the whole thickness of the Niobrara 
rocks, and extending, as I believe, into the basal strata of the Ft. 
Pierre. I am confidently of the opinion that thorough examination 
of the Pierre deposits will reveal the genus throughout a large 
part of their extent. 
From the study of the Kansas material in the University of Kan- 
sas Museum the following classification and characters seem to be 
most in accord with our present knowledge. I should prefer the 
term Pterodactyloidea for the suborder in place of Ornithocheir- 
oidea. The character of the scapular union cany not be of more 
than family value, since the resemblance otherwise between WVyc/o- 
dactylus and Ornithostoma is too great to separate the forms into 
separate suborders. 
Order Pterosauria. 
SyporDER ORNITHOCHEIROIDEA. — Tail short; wing metacarpal 
longer than the fore-arm; fifth toe rudimentary; nasal 
and ante-orbital vacuities more or less confluent. 
Famity OrnrrHocHeirip™.—-Distal end of scapula thickened 
and provided with articular facet for union with supra- 
neural articulation. Carpal bones three in number. 
SuBrAMILY ORNITHOCHEIRINA.—Jaws with well developed 
teeth. 
SuBrAMILY ORNITHOSTOMATINA.~--Jaws wholly edentulous. 
Fairy Preropactryiipa.—Scapula thin on the upper end, not 
articulating with neural spine. 
SupraMILy PrrropacryLina.—Jaws with teeth. 
Supramity Nvcropacryiina.—Jaws wholly edentulous(?). 
In the accompanying Plate II is given a restoration of Ornith- 
ostoma ingens Marsh. This species, of which O. wmdbrosum Cope is a 
synonym, is the most common one in the Kansas chalk. The char- 
acters which have been used to distinguish the species are, almost 
without exception, of doubtful value. The bones are invariably 
found crushed flat, with the articular surfaces distorted and changed. 
