344 0. C. Marsh—New Fossil Bird. 
posed of two transverse ridges, separated externally, and meet- 
ing at the inner extremities. 
The skull measures about 28°5 inches (722°™™:), in length ; 
85 inches (202.™™-), in width over the orbits; 6°75 inches 
(169™™-) between the summits of the maxillary horn Sons and 
25 (88™™) between the tops of the nasal cores. The m xilla ary 
horn cores are about 8 inches, or 75™™ in height. The canine 
is 9-25 inches (232:™™-) in length below the jaw, 64°™™"’, in lon- 
gitudinal diameter at base, 25°" in transverse diamete er. The 
molar teeth occupy a space of 150-™™-, and the last upper molar 
has an antero-posterior diameter of 36-™™, The species may be 
be called Dinoceras mirabilis. The present animal was nearly 
as large as an nha The remains now known are from the 
Eocene of Wyom 
Another aon is elical by portions of a skull with teeth, 
and some other ragmentary remains. his specimen ers 
essentially from Dinoceras mirabilis, in the upper molar teeth, 
the last of the series =F proportionally much larger than the 
corresponding tooth in that species, and having, moreover, 4 
broad floor extending bankas between the posterior crest and 
the basal ridge. The length of the upper molar series of six 
teeth is 163°™™-, the last true molar being 45°™™ in antero-pos 
terior Sianeli and also in transverse dikinieor This species, 
equalled D. mirabilis in size, and may be called wg lacus- 
remains are also from the Eocene of Wyoming. 
The species of Dinoceras, and those of Tinoceras, represent & 
distinct order which may be called Dinocerea, A full descrip: 
tion of these interesting mammals will be given at an early day. 
Notice of a New and Remarkable Fossil Bird ; by O. C. MARSB- 
One of the most on a of recent discoveries in Paleon- 
0 
ssil bird, found, during yD 
eantsatoe "The remains indicate an aquatic bird, about 4 
large as a pigeon, and differing widely from all known birds, 
in having biconcave vertebroe e cervical, dorsal, and cau udal 
vertebre preserved all show this character, the ends of the 
centra resembling those in Plesiosaurus. The rest of the 
skeleton presents no marked dggintion from the page avi 
type. e wings were large in proportion to the posterior 
extremities. me humeru rigs 586" in length, and has se 
radial crest strongly developed. The femur is small, and has 
ie transversely. The t ibia is slender, 
and 445™™- long. Its distal end is incurved, as in $ pee 
birds, but has no supratendinal bridge. This species il 
called Ichthyornis dispar. A more complete oman ‘ri 
appear in an early number of this Journal. 
Yale College, Sept. 26th, 1872. 
