308 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



shovel-shaped protuberance, which united at an open angle 

 with its fellow on the middle line of the front. 



These beasts must have lived in herds, like the elephants 

 of to-day, judging from the abundance of their remains, no 

 less than twenty-five or thirty individuals having left their 

 bones within a short distance of one of the camps of the par- 

 ty. Three species were distinguished M cornutus y Mfurca- 

 tus, and E. pressicornis. 



THE AEMED METALOPHODON. 



This is an extinct odd-toed ungulate discovered by Profess- 

 or Cope in the lower " Green River" division of the eocene 

 of Wyoming. The only species was named-JI/". armatus. It 

 possessed a full series of six superior incisors, and had a for- 

 midable knife-like canine, with cutting edges, and a groove 

 on the outer face. The premolars are like those of Bathmo- 

 don i.e., with one outer crescent while the molars differ in 

 having the constituent crests of the single crescent separated 

 on the inner side of the tooth, thus producing two subparal- 

 lel crests. The lower premolars are singular in possessing 

 one crescent, with a rudimental second by its side. This in- 

 creases in proportion on the posterior teeth, till on the last 

 inferior molar the two are nearly equally developed. Alter- 

 nate ridges are, however, on this tooth reduced and rudiment- 

 al, leaving a parallel two-crested tooth, approaching a tapir, 

 or a Dinotherium. There were probably tusks in the lower 

 jaw. 



The species was about the size of the rhinoceros, and con- 

 stituted another addition to the well-armed ungulates of the 

 "Wyoming eocene. The transitional forms seen in its tooth 

 structure constitute a point of especial interest. 



FOSSIL FISHES AND INSECTS FROM THE NEVADA SHALES. 



In the tertiary coal group of the Rocky Mountains, Profess- 

 or Cope made some interesting discoveries at Osino, Nevada, 

 about twenty-five miles northeast of Elcho, on the Central 

 Pacific Railroad. The associated shales contain fossils, con- 

 sisting of leaves (principally of dicotyledonous plants), mol- 

 lusks, insects, and fishes, the two last frequently in a fine state 

 of preservation. The mollusks are similar to Planorbis vivi- 

 parus, and the insects principally Diptera and Nematocera. 



