1878.] *0 [Cope. 



Measurements. 



No. 2. M. 



Length of base of series to canine 062 



" " second premolar 018 



" " sectorial 025 



Elevation to summit of infraorbital foramen 033 



The characters displayed by the second cranium lead me to suspect that 

 it is that of a female. A striking feature of the superior dental series is the 

 small size of the canine, which is also not much compressed at the base. 

 As regards the cranium, the sagittal crest is only distinct over the posterior 

 part of the brain case ; the zygomata are not very widely expanded, and 

 the muzzle is narrowed. The external infraorbital foramen is large. 



The mental border of the mandibular ramus is not flared downwards 

 but is continuous, but the external is separated from the anterior and in- 

 ferior faces by strong angles. The diastema is long. Three molars, all 

 large ; the first without anterior basal tubercle, the second with a large one. 

 Sectorial tooth the longest, with well developed simple cutting heel. 



Measurements. M. 



Total length of cranium 192 



Greatest width " 123 



Length of dental series with canine 077 



Diameter of canine at base \ "^ 



I transverse 008 



Distance between canine and second premolar 019 



Length base second premolar 019 



Length base sectorial 023 



Length inferior dental series, with canine 094 



diastema 025 



Length base of first premolar 015 



" " sectorial 027 



Depth of ramus below second premolar 032 



" " superior canine 027 



This sabre-toothed tiger is larger than the Machmrodus primcevus, and is 

 more like the animal indicated by a fragment of the lower jaw named by 

 Leidy, M. occidentalis. But the latter agrees with the M. primcevus in the 

 relatively small size of teeth, especially of the first premolar, and in their 

 oblique position, characters not seen in M. brachyops. 



Perissodactyla. 



Anchitherium eqtjiceps, sp. nov. 



This animal is represented by a portion of the skeleton including a com- 

 plete cranium of one individual with mandibular rami of several others. 

 The characters of the species are well marked, and do not approach very 

 nearly to those of any other known to me. 



The skull is considerably larger than that of A. bairdi, and the length 



PROC. AMER. PHILOS. SOG. XVIII. 102. J. PRINTED DEC. 80, 1878. 



