33G ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



that it did not shed its horns when living. It was called 

 Dicroceras dichotomies. Subsequently a similar species was 

 obtained by Dr. Hayden in Nebraska, and was named Anti- 

 lope fur cata. A species of different character was discovered 

 at the same time, and it had apparently shed its horn, and 

 had a new one united to its base by a bur, as in the deer. It 

 was described as Cervus warrenii. Professor Cope, of the 

 Wheeler survey, rediscovered these species in New Mexico, 

 along with two others not previously known, and referred 

 them all to the genus Dicroceras, on account of the following 

 observations : He noticed that in about half the individuals 

 of a given species the horns are attached to the skull without 

 interruption, as in an antelope, while in the others it had 

 evidently been broken off and reunited. A mass of bony 

 projections was developed at the point of union, producing 

 a small bur, as in the living deer. It was evident that 

 the cause of these appearances was an ordinary fracture and 

 subsequent anchylosis, and it was supposed that the animals 

 had broken off their horns in combats at the rutting season, 

 in the spring of the year. It was inferred, further, that the 

 excess of growth necessary to repair became, like many other 

 animal phenomena, periodical, and that it was followed by 

 feebleness and death of the horn. The latter was then cast 

 off like any ordinary slough of dead bone. 



NEW TERTIARY MAMMALS. 



Professor Marsh, in the appendix to the American Journal 

 of Science, presents a fourth notice of new tertiary mammals, 

 anions the most interesting of which are .Lemiiravas dista?is 

 and Laopithecus robustas, two new genera and species of 

 quadrumana. These were obtained on a recent expedition 

 of the author to the Bad Lands of Nebraska. The last men- 

 tioned a species of monkey is represented by a single lower 

 jaw, of about the size of that of a coati mundi. 



Under the name of Dicer atherium, Professor Marsh has de- 

 scribed a distinct species of rhinoceros, provided with horns, 

 the first of this character hitherto described in America. 

 Here the horns were placed transversely, as in modern rumi- 

 nants, and the remains indicate an animal of about two 

 thirds the size of the Indian rhinoceros. Two other species 

 of the genus, of less size, were also indicated. 



