212 O. @. Marsh on Cretaceous and Tertiary Birds. 
These remains, also, were found by John G. Meirs, Esq., near 
Hornerstown, New Jersey, and by him presented to Yale Col- 
lege, in behalf of the Cream Ridge Marl Company. 
REMAINS OF TERTIARY BIRDs. 
The few remains of birds hitherto discovered in the Tertiary 
deposits of the United States naturally show a much closer 
resemblance to recent species than those from the Cretaceous. In 
the specimens examined by the writer during the present inves- 
tigation, which include, it is believed, all the remains of import- 
ance known from the formation in this country, no characters 
implying genera distinct from existing birds are apparent, and 
some of the fossils seem to indicate species nearly related to 
those now living. Future discoveries, however, will doubtless 
disclose more important differences between faunze so remote in 
time. 
Puffinus Conradi Marsh, sp. nov. 
The collection of the Academy of ‘Natural Sciences in Phila- 
delphia has for many years contained the distal half of a left 
humerus, and the lower portion of a right ulna, of an ag me 
bird, which were discovered in the Miocene of Maryland by T. 
A. Conrad, Esq. A brief mention of these specimens, and of 
some other ornithic remains from the United States, has already 
been made by Professor Leidy,* but no description of them has 
yet been published. The specimens are so well preserved, and 
so characteristic, especially the humerus, that the affinities of 
the species they indicate can be determined with tolerable cer- 
tainty. The most marked feature of the humerus is the trans- 
verse obliquity of its shaft and distal extremity. Both are 
much compressed, and so turned that the common plane of theit 
onger diameters, instead of being nearly vertical, as in the 
hium of most birds, is here highly inclined inward and 
downward. Among the other characters of importance may 
mentioned, the unusually small size of the ulnar condyle, the 
very deep, oval impression for the attachment of the anterior bra- 
nial muscle, and the presence of an elongated, comp apo 
physis, extending outward and upward em the exterior mar 
gin of the distal end, just in front of the radial condyle. 
This humerus has the following dimensions :— 
Length of portion preserved, : s - 49¢ mm 
Vertical diameter of distal extremity, « 13°2 
Transverse diameter of radial condyle, - - 86 
Transverse diameter of ulnar condyle, Mi 
Breadth of impression of anterior brachial muscle, 3°8 
Longer diameter of shaft where broken, —- “4 
Shorter diameter of shaft where broken, - + is 
* Proceedings Acad. Nat. Sciences, Philadelphia, 1866, p. 237. 
