444 G. I. Adams — Extinct Felidce of North America. 



5. Dentition IfCjPmfM^ Dinictis. 



c. Superior sectorial without internal cusp. 



ff. Anterior basal cusp of superior sectorial, incipient 

 premolars without basal cusps. 



6. Dentition IfC^PmS-^Mi Hoplophoneus. 



I. Dentition I/2C/lPm/lM/l Eusmilus. 



d. Anterior basal cusp of superior sectorial well-developed, 



no internal cusp, premolars with basal lobes. 

 gg. Superior sectorial with single anterior basal cusp, post- 

 glenoid and post-tympanic processes distinct. 



8. Dentition I|C| f M| Machcerodus. 



hh. Superior sectorial with a second anterior basal cusp, 

 post-glenoid and post-tympanis processes coossi- 

 fied. 



9. Dentition IfCiPm^Mi Smilodon. 

 ii. Superior sectorial without internal root. 



10. Dentition probably like Smilodon, Dinobastis. 



II. Canines sub-conical and sub-equal, inferior and lateral 

 faces of ramus continuous with symphysial. 



Feline. 

 B. Anterior and inferior borders of mandible continuous. 



e. Superior sectorial with internal cusp. 



II. Dentition IfCfPrnfMJ- Pseudmlurus. 



12. Dentition I|C|Pm^-M| Felis. 



13. Dentition I|C|Pm|M^ Lynx. 



f. Superior sectorial without internal cusp. 



1 4. Dentition If CiPmf M^ Cyncelurus. 



EXPLANATION OF PLATES. 

 Plate X. 



Hoplophoneus primcevus, all x ■£. 

 Figure 1. — Skull (number 1 1013 Princeton Museum restored from number 10540.) 

 Figure 2. — Manus (number 10741 Princeton Museum.) 

 Figure 3.— Pes " 



Figure 4. — Femur " 



Figure 5.— Ulna and radius " 

 Figure 6. — Tibia and fibula " 

 Figure 1. — Humerus " 



Plate XI. 

 Hoplophoneus series, all x J. 

 Figure 1. — Hoplophoneus cerebralis (after Cope.) 

 Figure 2. — " oreodontis (10515 Princeton Museum.) 



Figure 3. — " primsevus (1 1013 Princeton Museum.) 



Figure 4. — " robustus (650 American Museum.) 



Figure 5. — " insolens (11022 Princeton Museum.) 



Figure 6. — " occidentalis (after Williston.) 



Plate XII. 

 Dinictis series, all x £. 

 Figure 1.— Dinictis squalidens (11379 Princeton Museum.) 

 Figure 2.-— " cy clops (after Cope.) 

 Figure 3.— 4< felina (10972) Princeton Museum.) 



Figure 4. — " fortis (10502 Princeton Museum.) [reversed.) 



Figure 5.— " brachyops (Cope's type, Amer. Mus., posterior portion 

 Figure 6. — " platycopis (after Cope.) 



