278 CROCODILID &. 
Synopsis of the Species. 
J. Snout very slender, Gavial-like, at least twice as long as broad at 
the base ; mandibular symphysis extending to the level of the 
sixth, seventh, or eighth tooth; premaxillo-maxillary suture, 
on the palate, produced posteriorly. 
Nuchal scutes in two longitudinal series, 
continuous or subcontinuous with the 
onsale. gerne suai crac cs te etree 1. cataphractus, p.279. 
Nuchal scutes six, four in a square with 
one on each side, subcontinuous with the 
dorguls racks. chee ak ARE eee 2. johnstonti, p. 279. 
Nuchal scutes six, four in a square with 
one on each side, widely separated from 
TRE OLSale) horny sis seri eve eee Semel oe 3. intermedius, p. 280. 
II. Snout more than once and a half, and not more than twice and 
one fourth, as long as broad at the base; mandibular sym- 
physis extending to the level of the fourth or fifth tooth ; 
preemaxillo-maxillary suture, on the palate, produced poste- 
riorly. 
A. No longitudinal ridge in front of the eye; anterior nuchal 
scutes (postoccipitals) well developed. 
A longitudinal swelling or ridge along the 
middlexoftbhe.SnoOut:) « <b}. We «acc steeds ot 4. americanus, p. 281. 
A longitudinal ridge between the orbits, 
mone on ithe SNOUL % hss laste os we whet 5. siamensis, p. 282. 
No ridges on the forehead or snout ...... 6. niloticus, p. 283. 
B. A longitudinal ridge in front of the 
eye; anterior nuchals usually absent. 7. porosus, p. 284. 
III. Snout not more than once and a half as long as broad at the 
base; mandibular symphysis extending to the level of the 
fourth or fifth tooth; premaxillo-maxillary suture, on the 
palate, transverse or curved forwards. 
A. Snout without ridges. 
Dorsal shield usually composed of four lon- 
gitudinal series of scutes, the median of 
which are broader than long.......... 8. palustris, p. 285. 
Dorsal shield composed of six longitudinal 
series of scutes in the middle ........ 9. robustus, p. 286. 
B. A more or less distinct oblique ridge in front of the eye. 
Scales on upper surface of limbs keeled .. 10. rhombifer, p. 287. 
Scales on limbs perfectly smooth ........ 11. moreletii, p. 287. 
