G. GENERAL NATURAL HISTORY AND ZOOLOGY. 307 



resembling the Varanidce, or monitors, but differing in certain 

 features pointed out by the professor. They are all from the 

 tertiary beds of Wyoming. Other species belong to two new 

 genera, Oreosaurus and I'inosaunis, together with a new spe- 

 cies of a genus, Glytosaurus, previously indicated. 



A cretaceous reptilian, allied to 3fososauriis, and possessing 

 peculiar characteristics. The animal has been called Colono- 

 saurus mudgei, after the discoverer, Professor Mudge, who 

 obtained the remains, in Western Kansas. 



THE PROBOSCIDIANS OF THE AMERICAN EOCENE. 



During the past summer Professor Cope, in charge of a di- 

 vision of Dr. F. V. Hayden's Geological Survey of the Terri- 

 tories, explored the paleontology of the eocene beds of Wyo- 

 ming Territory. He obtained many species of plants, mollusks, 

 and insects, and eighty species of vertebrata, of w T hich some 

 fifty are new to science. 



One of the most important of the discoveries made was the 

 determination of the type of proboscidians prevalent in that 

 period. This is exceedingly peculiar and anomalous in many 

 respects. Proboscidian limbs are associated with a denti- 

 tion of the same type when the number and position of the 

 teeth are considered. Thus a huge external canine alone oc- 

 cupies the front of the upper jaw (premaxillary bone) ; there 

 are apparently no incisors, and the molars are but few. The 

 incisor is shorter than in the mastodons, etc., and is com- 

 pressed, trenchant, and recurved, forming a most formidable 

 weapon. The great peculiarity is seen in the structure of the 

 molars, which is nearly that of J3athmodo?i,Cope, an allied pe- 

 rissodactyl. This type is, however, graded into an approach 

 to Dinotherium in another perissodactyl, J/<?tafo>Ao<?cm,Cope, 

 of which more below. 



The type species of this group, called by Professor Cope 

 Eobasileus cornutxis, was as large as the Indian elephant, but 

 stood lower, having proportions more as in the rhinoceros. 

 The elongate form of the cranium added to this resemblance. 

 The physiognomy was very peculiar. On either side" of the 

 front, above each orbit, rose a stout horn, its base continuous 

 with that of its mate. The immensely prolonged nasal bones 

 overhung the premaxillary, as in the rhinoceros, and sup- 

 ported on each side, near the extremity, a massive reverted 



