NIMEAVID.E. 953 



ting edge anteriorly; posterior edge not sen-ate. Incisors with short, 

 slightly spatulate crowns. Postglenoid and postparietal foramina jjresent. 

 Superior sectorial tooth without anterior lobe. Inferior sectorial with heel, 

 and without internal tubercle. No intermediate posterior lobes of the pre- 

 molars. 



This genus is of interest as completing the connection between the 

 saber-tooth and primitive unspecialized groups of the cats, a transition also 

 clearly indicated by the genus Nimravus. In dentition it adds a tooth to 

 the number belonging to that genus in both jaws, and has a smooth-edged 

 canine; it is otherwise identical with that genus, unless, indeed, the exos- 

 tosis supporting the inferior sectorial tooth in the A. dehilis be introduced 

 into this category; a position I am not prepared to assume. The molar 

 dentition only differs from that of Dinictis in the addition of a single tooth 

 to the superior series, but that genus has the compressed superior canine 

 and flared mandibular ramus of the saber-tooth. Archcelurus also eases 

 the passage from these genera to the Procelurus of Dr. Filhol, a highly in- 

 teresting genus obtained by that gentleman from the ])liosphatic deposits of 

 Central France. Procelurus has one more molar in the inferior series, and 

 its inferior sectorial exhibits an internal tubercle similar to that seen in 

 Dinictis. Like Archceluriis, it is not a saber-tooth. 



But one species of Archceluriis is known thus far, and this one has 

 been found in the John Day Miocene of Central Oregon. 



Arch^lurus debilis Cope. 



American Naturalist, December, 1879, p. 798 a (published Dec. 4). Palaeontological Bnlletiu, No. 31, 

 p. 3, Dec. 24, 1879. Proceed. Aiiier. Philos. Soc., 1879, p. 372. 



Plate LXXIn, tigs. 8-16; plate LXXII. 



This species, which is about the size of the panther (Uncia concolor), 

 is represented in my collection by parts of the skeletons of three individ- 

 uals. First, a cranium with mandible complete, and the atlas; second, a 

 cranium without mandible, but otherwise complete; third, a cranium ante- 

 rior to the zygomatic fossa, without dentition or mandible, but accomj^anied 

 by a lumbar vertebra; proximal part of scapula; both extremities of hu- 

 merus; proximal part of ulna; tilth metacarpus; both extremities of tibia; 



