or RECENT CROCODILIANS. 137 



a. Intermaxillary bone truncated behind, with a nearly straight hinder 



edge. Face broad, oblong. 



2. BoMBiFRONS. Toes webbed. Legs distinctly fringed. Asia. 



3. Palinia. Toes shoi-t, free. Legs with only an indistinct fringe- 



America. 



b. Intermaxillary hone elongate, produced, and truncated behind; 



sutures sloping backwards and converging, then transverse or 

 sinuous. Toes webbed. Legs fringed. 



4. Ceocodilus. Face oblong, without any ridge from front of orbit, 



forehead fiat. Africa. 



5. MoLiNiA. Face elongate, forehead convex, smooth, without any ridge 



from orbits. America. 



II. Cervical disk strongly keeled on each side, and nearly continuous with the dorsal 

 shield. Aberrant Crocodiles. 



* Face broad, nasal bone produced into the nostrils. AUigatoroid Crocodiles. 



6. Halcrosia. Africa. 



** Face very long, slender, nasal bones not reaching the nostrils. Gavialoid 

 Crocodiles. 



7. Mecistops. Africa. 



1. The nape with a rhombic disk formed of six plates, which is well separated 

 fromthe dorsal shield. Normal Crocodiles. 



A. Wuchal scutella none. Dorsal scales in four or six longitudinal series; the outer 

 series ovate-elongate. Toes webbed. Legs fringed. The intermaxillary bone 

 produced, truncated, and converging on the sides. Estuarine or brackish-water 

 Crocodiles. 



1. OOPHOLIS. 



Face oblong ; orbits with an elongated, longitudinal, more or less sinuous ridge in 

 front. Nuchal scutella none, or rudimentaiy. Cervical disk rhombic, of six plates. 

 Dorsal plates uniformly keeled, in four or six longitudinal series ; the vertebral series 

 with straight internal edges, the outer ovate-elongate. Legs acutely fringed. Toes 

 broadly webbed. Intermaxillary bone produced, and truncated behind, the sutures 

 sloping backwards and converging, and then transverse or sinuous. 

 Oopholis, Gray, Cat. Tortoises & Crocodiles in B. M. 1844 ; Ann. & Mag. Nat. Hist. 3rd series, x. 267. 



