n6 ALLEN'S NATURALIST'S LIBRARY. 



Wood, from the Upper Eocene of Hampshire; M. EDWARDSI 

 (Filhol), from Central France, a species larger than M. antiquus, 

 presents dental characters similar to the Galagos and the Mouse- 

 Lemurs ; M. PARVULUS (Filhol), and M. ZITTELI (Schlosser), are 

 both from the Quercy Phosphorites of France; while M. 

 ARMATUS is from the Eocene of Alsace, and M. (CRVPTO 

 PITHECUS) SIDEROLITHICUS from the Bonerg of Frohnstellen. 



GENUS MIXODECTES. 



Mixodectes, Cope, Proc. Amer. Phil. Soc., p. 447 (1883); id., 

 Rep. U. S. Geol. Surv., iii., p. 240, pi. xxiv. f, figs, i and 2. 

 The members of this genus, founded on fragmentary mandi- 

 bles from the Puerco (Lower Eocene) strata of NewMexico, have 

 a large front tooth " issuing from the ramus at the symphysis 

 like a rodent incisor, the second tooth being similar but smaller 

 and posterior and external to the first." The genus is repre- 

 sented by two species, M. PUNGENS, Cope, and M. CRASSIUS- 

 CULUS, Cope. 



GENUS CYNODONTOMYS. 



Cyrwdontomys, Cope, Palaeont. Bull, p. 151 (1882) ; id., Rep. 



U. S. Geol. Surv., iii., p. 243, pi. xxiv., fig. 2. 

 This genus contains but one species, founded on several 

 lower jaws disinterred from the Wasatch beds in the Big-Horn 

 Bad-lands, in Northern Wyoming. The lower incisors, or 

 perhaps, canines, are very large and close to the line of union 

 of the two halves of the jaw ; the molars have three cusps in 

 front and a heel behind. The dental characters of the genus 

 " resemble considerably those of Anaptomorphus and Necro- 

 lemur \Microckanu\ but the large size of the inferior canine 



