58 NORTH amp:rican batrachia and reptilia. 



Family TESTUDINID^. 



Genus Testudo, Linn. 



120. T. Carolina, Linn. Gopher Tui'tle. Above brownish; 



head almost black; beneath yellow; fore limbs large and strong; 



hind ones short and rounded; plastron projecting beyond the 



carapace in front. Austroriparian region. 



Order CKOCODILIA. 



Family CROCODILID^. 



Head depressed, elongated; nostrils approximated at end of 

 muzzle; tongue fleshy, adherent; teetli in a single row; body 

 depressed ; with solid, carinated shields on back; tail compressed 

 laterally; presacral vertebrae procoelian. 



Nasals entering into formation of nasal aperture; teeth 

 unequal. 



a. Muzzle broad; sides of head subparallel; forehead 

 divided longitudinally by a ridge; fourth pair of man- 

 dibular teeth received in pits in sides of upper jaw. 



AUigato7\ 

 h. Muzzle narrow, head tapering; fourth pair of mandib- 

 ular teeth received into grooves in edges of upper jaw. 



CroGodilus. 

 Genus Alligator, Cuv. 



127. A. TYiississippiensis, Daud. Common Alligator, Nu- 

 chal plates four, separate from cervical; on back eight longitu- 

 dinal series of quadrilateral and strongly tuberculo-carinated 

 plates; flanks covered by nine or ten rows of smaller, smooth, 

 rhomboidal plates; beneath, the smooth square plates are arranged 

 in transverse and longitudinal rows; above dusky brown or 

 black in adult; in young barred with yellow; beneath yellowish, 

 somewhat dusky. Austroriparian region. 



Genus Crocodilus, Cuv. 



128. C. americanus, Seba. Floridan Crocodile. Muzzle 

 elongated; nuchal plates four to two; cervicals six; dorsal plates 

 in four longitudinal series; vertebral large, regular, broader than 

 long; lateral series scattered, irregularly hexagonal; head and 

 back of male rough, of female comparatively smooth; the former 

 leaden black above; almost or quite destitute of yellow; the lat- 

 ter uniformly mottled with black and yellow; beneath pale yellow, 

 darker on sides, with fine irregular streaks and spots of black. 

 Floridan district. 



