SYNOPSIS. 115 



CARNIVORA. 



DIGITIGEADA. 



MACHAIEODUS. Dental formula : in. ^ c. ^ m. . Superior canine Ion", curved, 



3—3 1 — 1 3_3 ^ =' ' 



compressed laterally. Inferior carnassial tooth with a third lobe. 



Maohairodus primaevus. a little smaller than the American Panther. 



CHELONIA. 



TBSTUDO. Carapace with 10 vertebral plates, 8 pairs of costal plates, and 11 marginal plates each 

 side of a symmetrical nuchal and pygal plate ; and 5 yertebral scutes, 4 pairs of costal scutes and 11 

 marginal scutes each side of a narrow nuchal and a broad undivided pygal scute. First vertebral plate 

 oblong quadrilateral ; the succeeding plates to the eighth inclusive hexahedral ; penultimate plate inverted 

 V-shaped ; the last rhomboidal. Plastron composed of an entosternal and 4 pairs of lateral plates, and 

 furnished with 8 pairs of scutes. 



1. Testudo Nebrascensis. Small, emydiform. Entosternal plate encroaching upon the position of 

 the gular scutes, but usually not reaching that of the pectoral scutes. 



2. Testudo hemispherica. Hemiovoid. Entosternal plate encroaching upon the position of the 

 gular scutes, and reaching that of the pectoral scutes. 



3. Testudo Oweni. Robust. Entosternal plate not encroaching upon the position of the gular 

 scutes, but reaching that of the pectoral scutes. 



4. Testudo Culbbrtsonii. Large, depressed. Entosternal plate encroaching upon the position of the 

 gular scutes, but not reaching that of the pectoral scutes. 



5. Testudo LATA. It is possible that this species and the last indicated may be the same. In the speci- 

 mens upon which these two were proposed, the latter is very much the larger, but the former is immature. 

 In the former, also, the second vertebral plate is octohedral, while in the latter it has the normal hexahedral 

 form, but this variation may be an individual peculiarity only. 



