216 Screntific Intelligence. 
A striking feature in this jaw is the coronoid process, the 
anterior margin of which forms a right angle with the ramus, 
immediately behind the last molar. The angle of this jaw is 
much extended backward, but not perceptibly inflected. The 
condyle is low, and but slightly above the dental series. 
he figure below gives the outline and general features of 
this specimen. 
eee Ley 
sone 
— 
Right lower jaw of Tinodon bellus, Marsh. Twice natural size. 
The principal dimensions of this specimen are as follows: 
Space occupied by eight posterior teeth, 5 scar 
Space occupied by four posterior molars, ....:-. 6° 
Distance from last molar to posterior end of jaw, 9° 
Height of coronoid process above base of jaw,--- 7° 
Depth of jaw below last lower molar, -...-.-.-- 2°5 
Depth of jaw below last premolar, 2° 
a 
This specimen indicates a new genus, which may be called 
Tinodon, and the species Tinodon bellus, The animal thus 
represented was apparently an insectivorous marsupial,* and 
in size somewhat smaller than those above noticed. 
Yale College, August 16, 1879. 
SCIENTIFIC INTELLIGENCE. 
I. CHEMISTRY AND Puysics. 
1. On the Spectrum of Ytterbium.—Lxrcog pE BoisBaUDRAN 
having received from Marignac a portion of his new earth ytter- 
