380 TEIIDE, 
a 9. Rio Grande do Sul. Dr. y. Ihering [C.]. 
b-c. 3. Dept. of Soriano, Uruguay. R. Havers, Esq. [P. }. 
d-t. 3 her. & yg. Orueuay. 
k. Yo. es aes Montevideo. C. Darwin, Esq. [P.]. 
tn. Her, 5,2. Montevideo. Dr. Cunningham !P}. 
od. S. America, B. Bynoe, Esq. [P.]. 
pi Bs —P C. Darwin, Esq. [P.]. 
q. 2, skeleton. S. America. Berlin Museum. 
10. CROCODILURUS. 
Tupinambis, part., Daud. Rept. ili. p. 6. 
Crocodilurus, Spix, Spee. Nov, Lacert, Bras. p. 19; Wagler, Syst. 
Amph, p. 153; Wregm, Herp. Mex. p.8; Dum. § Bibr.v. p. 42; 
Gray, Cat. p. 25. 
Custa, Pleming, Philos. Zool. ii. p. 274. 
Ada, part., Gray, Griff. A. K. ix. Syn. p. 28. 
Tongue moderately elongate, not retractile, widened and emargi- 
nate posteriorly. Lateral teeth compressed longitudinally, bi- or tri- 
cuspid. Head with large regular shields; nostril pierced in the 
suture between two nasals. Eyelids developed. ar exposed. 
Limbs well developed, each with five digits, the toes with a denti- 
culated fringe laterally, inferiorly with small.squarish scales. Dorsal 
scales small, equal; ventral plates large, elongate, subquadran- 
gular, smooth, forming regular series. A collar fold. Femoral 
pores. Tail strongly compressed, with a double denticulated keel 
superiorly. 
Guianas, Brazil. 
1. Crocodilurus lacertinus. 
Crocodilurus lacertinus, Gray, Cat, p. 25. 
Tupinambis lacertinus, Daud. Rept. iii. p. 85. 
Crocodilurus amazonicus, Spiv, Spec. Nov. p. 19, pl. xxi.; Wagl. 
Icon, Amph. pl. xv. 
ocellatus, Spitz, .c. p. 20, pl. xxii. fig. 1. 
Teius (Ada) bicarinata (non L.), Gray, Griff. A. K. ix. Syn. p. 29. 
Crocodilurus lacertinus, Dum. & Bibr. v. p. 46. 
Habit of a Varanus. Upper head-shields: a fronto-nasal, a pair 
of prefrontals, a frontal, a pair of froutoparietals, a large interpa- 
rietal, a pair of parietals and a pair of occipitals; one or two small 
shields between the interparietals and occipitals; four large, and a 
small posterior, supraoculars ; two large supratemporals on each side ; 
a loreal, a preorbital, six or seven infraorbitals ; eight upper and 
seven or eight lower labials; chin-shields, one anterior and six pairs, 
the posterior separated from the labials by another row of large 
shields; gular scales small between the chin-shields, large and sub- 
hexagonal on the throat ; the scales in front of the collar-fold larger. 
Dorsal scales small, elongate, oval, slightly keeled or tectiform. 
Abdominal plates with the posterior border rounded, in twenty-four 
longitudinal and thirty-seven transverse series. Preeanal plates in 
three transverse scries, the median posterior pair largest. Femoral 
