G. GENERAL NATURAL HISTORY AND ZOOLOGY. 337 



The total number of new species of extinct mammals 

 amounts to twelve, and of genera to eight. 



PROFESSOR MARSH ON A NEW ORDER OF MAMMALS I TILLO- 



DONTIA. 



Professor Marsh, on the 17th of February last, made a 

 communication to the Connecticut Academy on a new order 

 of eocene mammals, for which he proposes the name of Tlllo- 

 dontla. These are anions; the most remarkable vertebrates 

 found in the American strata, and seem to combine several 

 distinct groups, such as carnivores, ungulates, and rodents. 

 In one genus, Tillotherhcm, the skull has the same general 

 form as in the bears, and in its structure resembles that of 

 the ungulates. In each jaw there is a pair of large, cutting 

 incisors, covered with enamel, and growing from persistent 

 pulps, as in rodents. The skeleton is most like that of the 

 carnivores, especially the bears. The radius and ulna and 

 the tibia and fibula are distinct. The other genera of this 

 order have less distinctive characters. Some of the animals 

 were as large as a tapir. 



There appear to be two distinct families of the new order; 

 one of them, which Professor Marsh calls Tillotheridce, in 

 which the large incisors grow from persistent pulps, while 

 the molars have roots; and the /Stylinodontidce, in which 

 the teeth are without roots. 4 D, March, 1875. 



EOTHERIUM ^EGYPTIACUM, A NEW FOSSIL SIRENIAN. 



Professor Owen has presented a communication to the 

 Geological Society of London upon a peculiar form of " sea- 

 cow," a sirenian mammal, named by him Eotherium mgyptia- 

 cum t which existed in the shallow waters from which the up- 

 per part of the nummulitic limestone of Egypt was deposit- 

 ed. The portion of the remains obtained shows that the ani- 

 mal had a relation to the recently extinct Hhytina stelleri 

 and to the Halitherium. 13 A, November '21, 1874, 568. 



SIR VICTOR BROOKE ON CERVUS BROWNII. 



Sir Victor Brooke, a high authority in every thing relating 

 to the Cervidce, or the deer family, takes occasion to criticise 

 the supposed species of fossil deer described by Mr. Boyd 

 Dawkins under the name of Cervus broionii. This he shows, 



P 



