14:6 G. I. Adams — Extinct Felidce. 



In all cases where the teeth are well preserved and unworn 

 these roughened ridges or denticulate borders are present. 

 The canines of ^Elurogcde are rounded anteriorly and have a 

 sharp posterior border which is denticulate. The anterior den- 

 ticulate line is located on the inner face as in Pseudcelurus. 

 The somewhat peculiar canines of Nimravus which are 

 described as pike-shaped are after all not so anomalous. The 

 posterior border, as was noted in the original description, is 

 denticulate and the anterior face is rounded, a sharp ridge 

 separating it from the inner. The canines of Archcelurus are 

 described as without anterior or posterior denticulate ridges, 

 but as I have previously stated these are not well preserved. 

 It is not probable however that they differed from all other 

 known specimens of the Felidse. While the canines of Nim- 

 ravus are exceptionally straight they are not so peculiar as the 

 illustration would suggest, 



# Genus Nimravus Cope. 

 (Synonyms, Archcelurus Cope, JElurogale Filhol, Ailurictis 

 Trouessart.) 



The structure of the molar series in Nimravus, Archcelurus 

 and ^Elurogale is the same, and now that the canines are shown 

 to possess no essential differences I propose to combine them 

 in one genus. ^Elurogale has been shown by Trouessart* to 

 be occupied, hence Nimravus would have the priority. The 



genus as thus constituted would be defined as follows : 



_j. 3 \ 



Dentition Pm M . Superior canines rounded 



anteriorly, posterior border sharp and denticulate, the anterior 

 denticulate ridge situated on the inner face of the tooth at its 

 base but forming the anterior border near its point. Superior 

 sectorial without anterior cusp } no positive inner cusp present, 

 the inner root supporting instead a convex buttress which 

 descends from the principal cusp. Lower sectorial with heel 

 but no postero-internal cusp. Anterior portion of the man- 

 dible with an obtuse angle separating the anterior face from 

 the inferior. The variation in dental formula is quite remark- 

 able, but Filhol has already noted as great a variation for 

 ^Elurogale. The dentition of Nimravus gomphodus is Pm f 

 AI -J, but in a second specimen the small tubercular molar is 

 absent from one side. The dentition of Archcelurus is Pm f 

 M J, that of the type specimen of ^Elurogale, Pm J- M \. The 

 genus also shows a considerable variation in size and one com- 



* Catalogue des carnivores vivants et fossiles 1886. " Le nom d'Ailurogale 

 ayant ete employe precedenient par Fitzinger. pour un sous-genere des chats 

 actueles (type Felis planiceps) nous avons propose de changer le nom du present 

 genre en Ailurictis." 



