1883. 04y [Cope. 



third or fourth premolar, with other teeth. The premolar is like that of 

 a creodont. Its principal cusp is a simple cone. To this is added a short 

 wide heel, whose superior surface is in two parts, a higher and a lower, 

 divided by a median ridge. A low anterior basal lobe, and a weak exter- 

 nal cingulum. 



The third specimen belonged to an individual a little smaller than the 

 other two. It includes the first inferior true molar, a tooth lost from the 

 others. Its form is somewhat narrowed anteriorly, where it has two low, 

 but well separated anterior inner tubercles, which form a V with the ex- 

 ternal anterior. 



Specimen No. 1 is accompanied by fragments of vertebrse and limbs. 

 The former are principally from the lumbar region, but fragments of the 

 atlas remain. This vertebra is of moderate length, and the cotylus is. 

 somewhat oblique. The vertebrarterial canal is rather elongate, and its 

 anterior groove-like continuation in front of the diapophysis is not deeply 

 excavated. The lumbar vertebrae are remarkable in the characters of their 

 zygapophyses. These display subcylindric surfaces of the posterior pair, 

 which indicates that the anterior ones are involuted, as in the specialized 

 Artiodactyles and Perissodactyles of the later geological ages. Such a 

 structure does not exist among carnivora, nor to my knowledge among 

 creodonta, nor in any mammals of the Lower Eocene. I do not find it in 

 Didelphys nor Phascolarctos, but it exists in a moderately developed degree 

 in SarcopMlus. The articular surface forms more than half of a cylinder, 

 and its superior portion is bounded within by an anteroposterior open 

 groove. The surface within this is not revolute, as in Bos and Sus, but 

 the articular surface disappears, as in Cervus. Eight such postzygapoph- 

 yses are preserved, all disconnected from their centra. Two of them are 

 united together. There are two other separated zygapophyses of smaller 

 size, which have but slightly convex surfaces. One is probably a prezyg- 

 apophysis of a dorsal vertebra. No centrum is preserved. 



Of the anterior limb there is a probable distal half of a radius. It is of 

 peculiar form, and resembles that of SarcopMlus ursinus more than any 

 other species accessible to me. One peculiarity consists in the outward 

 look of its carpal surface, which makes an angle of about 45° with the 

 long axis of the shaft. The obliquity in S. ursinus is less. The external 

 border of the shaft in M. ferox is, however, straight, and terminates in a 

 depressed tuberosity. Beyond this, the border extends obliquely outward 

 to the carpal face, which it reaches at a right angle. The internal border 

 of the shaft is gradually curved outwards to the external border of the car- 

 pal face. Its edge is obtuse, while the external one is more acute for a 

 short distance, and rises to the anterior (superior) plane of the shaft. The 

 carpal face is a spherically subtriangular with rounded angles. It displays 

 two slightly distinguished facets, one of which is superior, and the other 

 is larger and surrounds it, except on the superior side. The internal mar- 

 ginal projection, or "styloid process," is not so prominent as in S. ursi- 

 nus, and is a roughened raised margin. Joining it on the inferior edge of 



