64 MEMOIRS OF THE CARNEGIE MUSEUM 
Deodon shoshonensis Cope. 
Type: Symphysis of lower jaws. 
Horizon : (Upper?) John Day Formation. 
Locality : Bridge Creek, Wasco County, Oregon. 
Locality of Type: The American Museum of Natural History (Cope Collec- 
tion, No. 7387). 
The principal characteristics of the type are the absence of the osseous bosses on 
the chin and the evenly rounded under surface of the symphysis. Only the roots of 
the teeth are preserved in the alveolar border of the type. These show that there 
were three incisors, a canine, and two premolars. The roots of the median pair of 
incisors are laterally compressed and indicate that they were small as in Dinohyus 
hollandi. Iz and Ig were evidently much increased in size, Pz is close to the canine 
and Pz is separated from -P; by a short diastema as in Dinohyus. That Professor 
Cope had compared the type of Dxodon with Archxotheriwm is evident from his 
statement (9, p. 15) that “the canine teeth are very robust, as in the species of 
Elotheriwm,” but he associated Deodon with Chalicotheriwm and Titanotherium, per- 
haps wholly on account of the absence of the large dependent processes of the chin. 
In this connection I may state that the symphysis of Moropus is much more pro- 
cumbent and is of a decidedly more delicate structure than in the type of Dzodon. 
No Titanotheres have as yet been found in the John Day horizons, while Entelo- 
donts of the same size are sometimes discovered. 
MEASUREMENTS OF THE Typr SpEcIMEN OF Deodon shoshonensis. 
Mm 
Greatest antero-posterior diameter of symphysis 24..........cccccsseeeeeeeeeeeeenes 164 
Ms transverse 6 “ “ 144 
100 
Vertical diameter of ramus at Pz. 
Deodon calkinsi (Sinclair). 
Type: Skull, several vertebrae, and portions of fore and hind limbs. 
Horizon: Upper part of the Promerycocherus beds. 
Locality: Bridge Creek, Wheeler County, Oregon. 
Locality of Type: Paleontological Collection of University of California, No. 953. 
From the description and figures of Daodon (Elotheriwm) calkinsi (89, p. 184, 
Pl. XV) it is quite evident that the specimen pertains to the genus Dwxodon de- 
scribed by Cope in 1878(7, p. 15). Although the type of the latter represents an 
animal of considerably larger size, it agrees perfectly, so far as comparison can be 
made, with the species described by Sinclair. The character by which D. calkinsi 
*4'The alveolar border is broken, which naturally reduces the antero-posterior diameter to some extent. 
