6. CAIMAN. 293 
the fourth maxillary tooth, the other from the frontal pits to the 
fifth premaxillary tooth ; orbit produced anteriorly to the vertical 
of the ninth or tenth maxillary tooth ; upper eyelid flat, finely 
striated above, with a small bony plate anteriorly ; supratemporal 
fossee present ; vomer visible on the palate as a small rhomboidal 
plate. our or five transverse series of small postoccipital scutes ; 
four transverse series of large nuchals, the first two composed 
of four scutes, all articulated together. Dorsal shield composed 
of 19 transverse series of scutes, the broadest of which contain 
ten scutes; all strongly and sharply keeled. Ventral scutes bony 
and imbricate, except on the posterior abdominal region, where the 
ossifications are absent or reduced to asmall nucleus. Fingers free, 
outer toes half-webbed. Black above, yellow inferiorly. 
Total length 4 metres. 
Tropical South America east of the Andes, 
a. Ad., stffl. Para. R. Graham, Esq. [P.]. 
b, ec. Ad., skulls. Para. R. Graham, Esq. | P.]. 
d, Ad., skull. Ey Peru: Mr. E. Bartlett (KCI 
2. Caiman latirostris. 
Crocodilus latirostris, Daud. Rept. ii. p. 417 (1802). 
Caiman fissipes, Spi, Lacert. Bras. p. 4, pl. iii. (1825). 
Champsa fi-sipes, Wagl. Leon. Amph. ‘pl. xvil. (1830); Natterer, 
Ann. Wren. Mus. ii. p. 321, pl. xxii. (1840). 
Crocodilus sclerops (non Schn.), Wied, Abbild. (1831). 
Alligator sclerops, part.. Gray, Syn. Rept. p. 62 (1881). 
eynocephalus, Dims & Libr. iii. p. 86 (1888). 
Jacare fissipes, Gray, Cat. Tort. Sc. p. 64 (1844). 
latirostris, part., Gray, Ann. § Mag. N. H. (3) x. p. 328 
(1862), and Tr. Fool. Soc. vi. p. 163 (1867), and Cat. Sh. Rept. 
ii. p. 25 (1872). 
Alligator latirostris, Strauch, Syn. Crocod. pp. 19 & 73 (1866) ; Hensel, 
Arch. eae: 1868, p. 084; Burmester, Ann. Soc. Aryent. ix. 
D: 244 (1880). 
18 or 19 upper and 17 or 18 lower teeth on each side; fourth 
maxiJary tooth much longer than third. Head not more than once 
and a half as long as broad: snout very broad and rounded, its 
basal width nearly equalling its length; a strong ridge from one 
anterior border of the orbit to the other, more or less produced 
anteriorly towards the fourth maxillary tooth ; orbit not produced 
anteriorly ; interorbital space concave; upper eyelid rugose or 
tubercular, more or less produced into a small horn, with a small 
bony plate anteriorly ; supratemporal fosse present. Two more or 
less reguiar transverse series of small postoccipital scutes ; three or 
four transverse series of large nuchals, the anterior composed of 
four scutes, the others of two, the transverse series separated from 
each other by an interspace. Dorsal shield composed ot 18 transverse 
series of scutes, the broadest of which contain 8 or rarely 10 scutes ; 
those of the median serics very obtusely keeled in the adult. Bony 
