DINOCEEATA. 561 



family, which I have called the Eohasiliidoe. The three genera mentioned 



differ in the forms of the mandible; the fourth has certain cervical vertebrae 



of a peculiar form, but the form of the mandible is unknown. I can only 



contrast the genera as follows : 



A Mandible unknown. 



Certain cervical vertebrae short and flat, as in Proboscidia Eobasihus. 



A A Symphysis of mandible with four teeth on each side, 

 a Mandible without inferior expansion. 



Cervical vertebrae not very short Loxolophodon. 



y Mandible expanded below, its entire length. 



Cervical vertebrae unknown Bathyopsis. 



AAA Symphysis of mandible with three or two teeth on each side. 



Mandible with very narrow symphysis Uintatherium. 



History, <&c. — I originally* referred the Eobasileidce to the Proboscidia on 

 account of the structure of the limbs, and subsequently stated a number of 

 reasons for this conclusion at a meeting of the Academy Natural Sciences 

 of Philadelphia, held January 14, 1873 (published January 16.) In the 

 present paper numerous confirmatory characters are added. The Bathmo- 

 dontidce I at first referred to the Perissodactyla. 



Professor Marsh, in describing a species of this group, Titanotherium 

 (?) anceps (July, 1871), compares it with Perissodactyle species, and in 

 describing the tibia says that it, "at its proximal end, has the femoral sur- 

 faces contiguous, with no prominent elevation between them, resembling in 

 this respect some of the Proboscidia." A few days before the publication 

 of my conclusions, in a foot-note (July 22, 1872) he altered the name 

 Titanotherium to Mastodon, thus indicating that the species is a proboscidian. 

 Shortly after (American Journal of Science and Arts, September 27) he 

 altered his view, constructing a supposed new order, ^^ Dinocerea," for their 

 reception. 



EOBASILEUS Cope. 



Proceed. Amer. Philos. Soc, 1872, p. 485. Palaeontologioal Bulletin, No. 6, p. 2, Aug. 20, 1872. Annnal 

 Report U. S. Geol. Surv. Terrs., 1872 (1873), p. 575. 



This genus was established on a species which is represented by a con- 

 siderable part of the skeleton, but without cranium or teeth; hence most 



• Paleontological Bulletin No. 6, August 20, 1872, p. 2, reprinted in the Proceedings of the Amer- 

 ican Philosophical Society of like date. 



