220 PROCEEDINGS OF THE ACADEMY OF [1889. 



Third lower incisor, transverse diameter, -0035 



Lower canine, fore and aft diameter, -008 



Lower canine, transverse diameter, -006 



Length lower molar series, -052 



Length pm. 2, -006 



Length pm. 3, -012 



Length pm. 4, -0145 



Length m. 1, -0185 



Length m. 2, .006 



Vertebrae. 

 Attached to the Academy's specimen of the skull of Dinictis,. 

 which has been described above, are the four anterior cervical verte- 

 bras, which are decidedly feline in character, and resemble those of 

 the John Day Nimravldce described and figured by Cope. The atlas 

 is badly broken and only the slender inferior arch and deep anterior 

 cotyli can be certainly made out. The parts preserved, however, 

 agree closely with the atlas of Hoplophoneus, which in its turn is 

 most like that of Oryptoprocta. The transverse processes are much 

 more widely extended than in the Viverridce generally, and there is, 

 as in that family, a foramen in the anterior edge of the transverse 

 process (centroido-diapophysial, Albrecht) which in the cats is rep- 

 resented by a deep notch. The axis, so far as preserved, agrees 

 rather better with that of Oryptoprocta than that of Hoplophoneus; 

 the odontoid process is a very long and slender peg, while in Hop- 

 lophoneus it is broader and more depressed than is usual in the 

 carnivores. The centrum is depressed, slightly opisthocoelous and 

 provided with a small hypapophysial keel ; the atlanteal facets are 

 extended transversely, but have a small vertical diameter and are 

 not eniarginated by the neural canal. The posterior face of the cen- 

 trum is set obliquely to the long axis, as are the faces of the succeed- 

 ing vertebras, though not to the same extent as in the large cats. The 

 transverse processes are slender and shorter than in Oryptoprocta and 

 the anterior opening of the vertebrarterial canal is placed much 

 further forward than in that genus. The neural arch is high and 

 narrow and not obstructed behind by opisthapophyses, as in the 

 recent felines. The third and fourth cervicals have rather short and 

 quite broad centra, with hardly any indications of hypapophysial 

 keels. They are slightly opisthocoelous and the articular faces arc 

 somewhat oblique. The third has the neural spine represented by a 

 very low ridge, and as in the felines there are opisthapophyses ; the 



