2V0.7.J NIMRAVIDJ]: AND CANIDiE OF THE MIOCENE PERIOD. 181 



range cotemporary and generally similar species under the same gen- 

 eric head, as the most reasonable course in the absence of direct evi- 

 dence. 

 The American species of Galecynus, then, may be arranged as follows : 



I. Smaller species with little or no sagittal crest. 



* Temporal ridges uniting close behind orbits ; otic bullaj small. 



Small ; no external ridge on inferior sectorial G. gregariua Cope. 



** Temporal ridges uniting early ; otic bullae large. 



Larger ; no external ridge on inferior sectorial ; teeth robust. 



% G. geismarianus Cope. 

 Smaller; an external ridge on lower sectorial; teeth more robust. 



G. latidens Cope sp. nov, 

 ** Temporal ridges not uniting anteriorly ; otic bullae large. 



Least ; muzzle narrow ; superior tuberculars wide ; no external ridge on in- 

 ferior sectorial G. lemur Cope. 



Hyjenocyon Cope. 



Paleontological Bulletin, No. 31, 1879, p. 3 (Dec. 24); Proceedings American 

 Philosophical Society, 1879, p. 372. 



This genus rests ou the characters furnished by a single species, 

 which is represented by but few remains. Its family position is doubt- 

 ful, and my reference of it to the Canidce is only provisional. It may, 

 so far as the evidence goes, be a member of the Mustilidce or even of 

 the Felidce. 



Dental formula: 1. 1^; 0. |-; Pm. |; M. ,\. Last superior molar rather 

 narrow, transverse. Inferior premolars all two-rooted, and with well- 

 developed posterior cutting lobe. Inferior sectorial large, with heel. 

 Probably no inferior tubercular tooth. 



The characters above given agree with those of Icticyon in the su- 

 perior series, but differ in the inferior in the absence of the Pm. I. and 

 the M. II. 



The only known species is the Hyccnocyon hasilatus {UnJiydrocyon hasi- 

 latus Cope olim.), from the Truckee beds of Oregon. 



Icticyon Lund. 



Kongl. Danske Vidensk. Selsk. Afhandl. naturvidensk. og math. Classe, ix, 

 Deel, 1842 (October, 1841) fide Burmeister; Van der Hoeven Wissen. en 

 natianrk. Verb, der Koninkl. Akademie Amsterdam, Deel iii ; Burmeister 

 Erlauterungen zur Naturgesch. Brasiliens, 1856, 2. — Cynalicus Gray, Ann, 

 IMagaz. Nat. Hist. London, xvii, no. 112, 293. — Mdictis Sehinz. Eevue et 

 Magaz. de Zoologie, 1848, 176, fide Burmeister. 



The dental formula is, I, f ; C. i ; Pm. | ; M. i. The single superior 

 tubercular molar is similar in general to that of other Canidw. The in- 

 ferior sectiorial has an internal cusp and i)osterior heel, the latter with 

 a low cutting edge on one side. Inferior tubercular well developed. 

 One existing and one extinct species have been found in Brazil, the 

 latter in the caves. I described a species from the Miocene which I can- 

 not separate from tliem generically. This is the Icticyon crassivuJtus 

 Cope (Proceedings Academy Philadelphia, 1879, p. 190). 



