SYNOPSIS. 115 
CARNIVORA. 
DIGITIGRADA. 
3—3  1—1 4—4 
: Cs Mm. : 
3—3 1—1 3—8 
compressed laterally. Inferior carnassial tooth with a third lobe. 
MACHAIRODUS. Dental formula: zn 
Superior canine long, curved, 
Macnairopus primAtvus. A little smaller than the American Panther. 
CHELONIA. 
TESTUDO. 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 vertebral 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. Testupo 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. Hemioyoid. Entosternal plate encroaching upon the position of the 
gular scutes, and reaching that of the pectoral scutes. 
3. Testupo Owent. Robust. Entosternal plate not encroaching upon the position of the gular 
scutes, but reaching that of the pectoral scutes. 
4. Testupo Cursertsonti. Large, depressed. Entosternal plate encroaching upon the positién of the 
gular scutes, but not reaching that of the pectoral scutes. 
5. Testupo 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. 
