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Cope. ] 420 (March 1,. 
BATHMODON SEMICINCTUS. Cope. Sp. nov. 
This species differs from the last in several particulars of dentition.. 
The interior ridge (homologous with the inner erescentic) bounding the 
middle plane of the superior molars, is not continued on the posterior 
face of the tooth, but curving inwards joins the outer crest at its apex. 
The outer crest terminates in a conic tubercle anteriorly on the external 
face, the rudiment of the anterior crescentic ridge appearing as a low 
ridge from the side of the posterior one, and rising to a point on the an- 
terior margin of the crown. There is no cingulum round the anterior 
base of the crown. The latter is as long as wide. The inner crest is 
reduced to a mere angle, and its posterior face is not basin-shaped 
but rises to the crest of the inner crescent. The outer face of the latter 
is sub-horizontal with rising apex, and is concave transversely. Its an- 
terior outer base is narrowed but is less elevated than the posterior. 
Measurements. M. 
Length basis crown....... Le, Vl Oe Paes a he 0225 
Width ee ESE) LES RE Er a 022 
ig exterior crescent...) iss: vere ig pie s O18 
Depth “4 e Dien ae velar, Ae eee 02 
This animal was not more than half the bulk of the last; its size was: 
about that of the Tapirus terrestris. The differences in dentition which 
it presents are so marked as compared with the last species, as to induce 
me to believe that it will be found on fuller acquaintance to belong to» 
another genus. This may be called Lovolophodon. Other remains belong- 
ing to these species, or relating to it in size, are contained in Dr. Hayden’s 
collection, but cannot now be referred to with certainty. 
From the Wahsatch Beds, near Evanston, Utah. 
Especial interest attaches to these fossils from the fact that, they belong 
to the oldest of the tertiary periods of North America. The Wahsatch 
Group, according to Dr. Hayden, underlies the Bridger Group, which has. 
yielded so many mammalian species to the researches of Leidy and Marsh. 
These have been supposed to be Eocene, so that the age and species 
here described is not later than that. The character presented by the 
molar teeth are very peculiar, and indicate not only a new genus, but 
anew family. This has a remote affinity only to the group of Palwosyops: 
Titanotherium, ete. 
ON TWO NEW ORNITHOSAURIANS FROM KANSAS. 
By Epwarp D. Copn. 
(Read before the American Philosophical Society, March 1, 1872.) 
The species about to be described resemble, in their large proportions,. 
the large pterodactyles of the English chalk and green sand. The speci- 
mens at my disposal consist chiefly of portions of the anterior limb, of 
metacarpals and phalanges. Some of the phalanges of the claw-bearing 
digits are remarkable for their relatively large diameter, a peculiarity 
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