Professor Marsh’s Monograph of the Dinocerata. 187 
“ Another remarkable feature in the lower jaw of the Dino- 
cerata is the ccd direction of the condyles, hitherto un- 
known in Un 
“In the genus Denes there are three incisor teeth, and a 
c 
mamunals. ind this series, and immediately over the de- 
pendent piviosdé is a long diastema. Furthe a there are 
three premolars, and three molars, forming toeetlice a close 
series. This is the dentition, essentially, in the lower jaw of 
both Dinoceras and Tinoceras. 
“ In the female of Tinoceras, the pendent process is much 
reduced, its size in all cases corresponding to the size of _ 
canine tusk above. 
“That the same relation in size between the tusk and pro- 
cess below it, holds equally in both the genera Dinoceras and 
oo is ner shown by various specimens in the 
e 
Tue Trern. 
“The teeth of the Dinocerata constitute one of their most 
interesting features 
“In the genus Dinoceras, the dentition is represented by 
the following formula: 
3 3 
Incisors ©, canines 7 premolars — = molar 3 = 34 
“So far as now sa aly the same formula applies equally well 
to the genus Jin 
“In Ut indtthertuns + the dentition is apparently as follows: 
3 
Incisors > canines 7 premolars 5 molars 3 36. 
“In none of the Dinocerata have any y Speer incisors bee 
found, even in the oungest specimens. The ssiaaitiary 
bones appear to be entirely edentulous. 
