574 The American Naturalist. : [June, 
Dinictis fortis sp. nov. 
This species is based upon two specimens in the Princeton Museum, 
(number 11085 from the upper Titanotherium Beds and number 10933 
from the Lower Oreodon Beds) which were collected by Mr. J. B. 
Hatcher in the summer of 1894. Number 11085, in which the front 
portion of the skull and the mandibular rami are preserved, is taken 
as the type specimen. Besides the skull there are present the distal 
end of the scapula, the humerus, most of the lumbar vertebra, pelvis, 
proximal half of the femur, the tibia, astragalus and the bones of one 
digit. Of specimen 10933 there are portions of the skull showing the 
typical dentition and in addition to the bones of the type specimen 
there are the radius, ulna, scapho-lunar and additional foot bones and 
vertebree, thus making it possible to give all the distinguishing char- 
acters of the species excepting those of the posterior portion of the 
skull. 
Typical characters: The species differs from 
D. felina in that the muzzle is much shorter 
and broader and the orbital plate of the maxil- 
lary is larger and heavier. The differences in 
dentition are the entire absence of the paraconid 
of the second premolar, the larger upper 
= teeth as shown in the lower premolars. The 
Fig. 1. Dinictis ada skeleton is larger, the limb bones approaching 
fragment of jaw, x J. . in proportions those of Hoplophoneus occiden- 
talis but with more slender shafts. 
The Skull: The fact that the posterior portion is not preserved 
prevents the description of many important points, but the characters 
of the anterior portion are distinctive. The nasals are broader than 
those of D. felina and the premaxillaries are heavier and more rounded 
in their lower portion. The opening of the anterior nares is corre- 
spondingly broader. The maxillaries unjte with the nasals and pre- 
maxillaries so as to form a regularly curved surface, in consequence of 
which the muzzle presents a rounded appearance. The orbital plate 
is heavier and extends farther forward, the anterior portion of the 
malar process of the maxillary being over the posterior root of the third 
premolar while in D. felina it is above the anterior root of the sectorial. 
This fact also has an important bearing on the shortening of the muzzle. 
The orbit is wider aud the infra-orbital foramen is distinctly larger. 
The anterior portion of the palate is somewhat broader, otherwise it pre- 
sents no special characteristics. The horizontal ramus of the mandible 
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