NATURAL SCIENCES OP PHILADELPHIA. 27*7 



Near the St. Lawrence River, six miles southwest of Brockville, 

 large octahedral crystals of iron pyrites, some of them 4 inches in 

 diameter. 



All of these minerals are well crystallized, except the peristerite 

 and chondrodite, and most of them are found in splendid speci- 

 mens. 



I am indebted to Prof. B. Silliman for the examination of the 

 above-mentioned micas. 



Bemarks on Fossils from Wyoming. Prof. Leidy directed 

 attention to some fossils recently received from Dr. J. Van A. 

 Carter, of Fort Bridger, Wyoming. He characterized them as 

 follows : 



1. Pal^eosyops junior. Intermediate in size to P. jxiludosus 

 and P. humilis. Founded on portions of a lower jaw agreeing in 

 character with the corresponding parts of P. paludosus but smaller. 

 Space occupied by the last premolar and the true molars, 4 inches. 

 Antero-posterior diameter of last premolar, 8 lines; of last molar, 

 17i lines. 



2. Uintacyon edax. A remarkable animal, probably marsupial. 

 Indicated by the greater part of a ramus of the lower jaw resem- 

 bling in its form the corresponding part in the Fox. Number of 

 incisors unknown. Fang of canine indicates a tooth proportion- 

 ately as large as in the latter animal. Molar series following close 

 upon the canine, and consisting of eight teeth! First premolar 

 with a single fang, but lost. Second premolar nearly like that in 

 the Fox. Third, anomalous in form as a lower tooth and probably 

 so altogether. The crown is conical, and is inserted by three 

 fangs, of which the odd one is external to the others. The 

 remaining teeth holding the relative proportions of those in the 

 Fox. Fourth premolar with a conical crown and with a thicker 

 heel than in the latter. The fifth premolar and the fore part of 

 the crown of the first molar are lost. The back of the crown of 

 the first molar and the succeeding tooth nearly resembling those 

 in the Fox. The last molar is a small tooth as in the latter, and 

 is inserted by a single fang. Space occupied by the molar series, 

 one and a quarter inches ; that of the true molars is half an inch. 

 Breadth of first molar, one-fourth inch; of second molar, two lines ; 

 of last molar, one line. 



3. Uintacyon vorax. Apparent^ a larger species, indicated 

 by a lower jaw fragment containing the second molar, part of the 

 first one, and the socket of the last. Space occupied by the true 

 molars about eight lines ; breadth of second molar, three lines. 



4. Chameleo pristinus. Indicated by a lower jaw fragment 

 containing eight teeth in a space of five lines. In every respect it 

 agrees in character with the corresponding part in living species 

 of the genus. 



