54 The Amblypoda. [January, 
was an animal probably as large as the Javan rhinoceros (R/i- 
nocerus sondaicus), or rather smaller than the Uintatherium 
robustum. 
The characters of the inferior molars in this and other genera 
of Dinocerata are very peculiar. In Bathyopsis they are con- 
structed on the plan of those of insectivorous marsupial and pla- 
cental mammals, so as to lead to the suspicion that its food con- 
sisted of Crustacea, or insects of large size, or possibly of thin- 
shelled Mollusca. : 
a Bf mt 9 vi, 
zi 
a AEN SEE 
Fic. 35.—Bathyopsis fissidens Cope, mandible from right side, four-ninths nat. size. 
Specimen represented in Fig. 7. From the Wind River (Bridger) bed of Wyoming. 
Original, from Vol. 11, U. S. Geol. Survey Terrs., F. V. Hayden. 
Ae 
= 
se 
The form of the ridges of the anterior part of the jaw of the 
Bathyopsis fissidens, together with the remarkably large dental 
canal and mental foramen strongly suggest that the animal pos- 
sessed a large and perhaps prehensile lower lip. The lateral de- 
scending crests of the lower jaw must have affected the physiog- 
nomy curiously, especially when viewed from the front. 
In the history of the discovery of the various types of the 
Amblypoda, we have an illustration of the prevision which the 
paleontologist may exercise as a legitimate inference from known 
facts. In closing his memoir on these animals (p. 44) Mr. Osborn 
remarks: “In the Upper Cretaceous or early Eocene lived a 
