OF RECENT CROCODILIANS. 147 
enlarged likeacanine; but thisisnot correct. I have examined the dentition of eighteen 
skulls of various species; in the lower jaw there are always nineteen teeth, but in the 
upper jaw the number in the adult is seventeen on either side, while in the young it 
is eighteen. This is owing to the second incisor being deciduous; and in old skulls the 
socket is completely obliterated by the enlargement of foramen for the two anterior 
teeth. Thus in old animals there are only four teeth in each intermaxillary bone, while 
in the younger individuals there are always five. So, more strictly, it is the tenth, and 
not the ninth, upper tooth which is enlarged.”—P. Z. 8. 1857, p. 50. 
CROCODILUS VULGARIS. (Olive African Crocodile.) 
Crocodilus niloticus (part.), Daud. Rept. ii. 267. Wagler, Syst. Amph. t. 7. f. 11. 1, 2. 
Crocodilus vulgaris, Cuvier, Oss. Foss. v. 42, t. 1. f.5 & 12, t.2. f.7. Blainv. Ostéogr. Crocod. 126. 
Gray, Ann. & Mag. N. H. 3rd series, x. 271. Huxley, Proc. Linn. Soc. iv. 6. 
C. suchus, Geoff. Ann. Mus. x. 84, t. 3. f. 2-4. 
C. chamses, Bory, Dict. Class. H. N. v. 105. 
C. lacunosus, Geoff. Croc. d’ Egypte, 167. 
C. marginatus, Geoff. Desc. @ Egypte, 365. Gray, Cat. Tortois. 61. 
Crocodilus cataphractus, Riippell, MS. Gray, Syn. Rept. 78. Mus. Frankfort. 
Crocodilus verd de Sénégal, Adanson, Sénég. Cuvier Oss. Foss. v. 4. 
Crocodilus acutus, Owen, Cat. Osteol. Mus. Coll. Surg. p. 157. n. 715, not Cuvier. 
Crocodilus binuensis, Balfour Baikie, Proc. Zool. Soc. 1857, xxv. 484. Skull described. 
Green crocodile, Gray, Rep. of Brit. Assoc. 1862, Sections, p. 107. 
Hab. African rivers. Living on the mud-banks: North Africa, Egypt; West Africa, 
Senegal (Adanson) ; Gaboon (Murray, Cope); South Africa, Cape of Good Hope; Central 
Africa, Kwora and Binui (Baikie); Madagascar (Havet, fide Cuvier, Oss. Foss. 44). 
Fig. 5. 
Figs. 5, 6, 7, 8. Head and nuchal and cervical shields of Crotodilus vulgaris. 
