398 Scientific Intelligence. 
several teeth in good preservation. The lower molars have a 
strong basal ridge on the inner surface of their crowns. The 
ramus of the lower jaw is compressed. The mylo-hyoid groove 
is well marked, and is continued forward much further than in 
the smaller species. 
The main dimensions of this specimen are as follows: 
. 
This specimen pertained to an animal about the size of the 
preceding species. 
Linodon lepidus, sp. nov. 
Another species of Tinodon, the smallest yet found, is repre- | 
sented by a left lower jaw, in fair preservation. This specimen 
differs from the type of 7. bellus, which it most resembles in 
size, in having smaller teeth, the inner margin of the jaw 
somewhat inflected, and the angle extending downward below 
the condyle, instead of being emarginate at this point. The 
condyle, moreover, is on a level with the base of the teeth, and 
not above their crowns, as in the type species. 
The present specimen measures as follows: 
Pr ae ne ee ee — 
Distance from first molar to end of condyle ----- LBS re 
Space occupied by four molar teeth _...__-..---- 6° 
Depth of jaw below first lower molar.____.____-- 2°5 
Depth of jaw below con 2° 
; 
. 
_ All the specimens here described are from the same locality, 
in the Upper Jurassic of Wyoming, and are now preserved 1n 
the Yale Museum. 
Yale College, New Haven, October 22d, 1879. 
SCIENTIFIC INTELLIGENCE. 
I. CHEMISTRY AND Puysics. 
1. On a new method of preparing Hyponitrous acid.—Since 
the method of preparing sodium hyponitrite by 
nitrite with s 1 : 
small, Zorn has devised an electrolytic method for producing 1t, 
which works well At first he used platinum electrodes in a con- 
_ A pretty active evolution of gas ns in a short time, the ga8, 
— Bo . », containing no‘ammonia. If the current be broken after 
_ S short time, the liquid neutralized with acetic acid, and t 
