OF EECENT CEOCODILIANS. 



147 



enlarged like a canine ; but this is not 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. IS. 1857, p. 50. 



Ceocodilus vulgaris. (Olive African Crocodile.) 

 Crocodilus niloticus (part.), Daud. Eept. ii. 367. Wagler, Syst. Amph. t. 7. f. 11. 1, 2. 

 Crocodilus vulgaris, Cuvier, Oss. Foss. v. 42, 1. 1. f. 5 & 12, t. 2. f. 7. Blainv. Osteogr. Crocotl. 120. 



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, Diet. Class. H. N. v. 105. 

 C. lacunosus, Geoff. Croc. d'Egypte, 167. 



C. marginatus, Geoff. Dese. d'Egypte, 365. Gray, Cat. Tortois. 61. 

 Crocodilus cataphractus, Riippell, MS. Gray, Syn. Rept. 78. Mus. Frankfort. 

 Crocodilus verd de Senegal, Adanson, Seneg. 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. 



Hal). 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 {Ilavet, fide Cuvier, Oss. Foss. 44). 



Ks. 5. 



Fig. 7. 



Fis. 6. 



Fis. 8. 



■^Ljfn' 



Figs. 5, 6, 7, 8. Head and nuchal and cervical shields of Crotodihis vulgai-is. 



