OF EECENT CKOCODILIANS. 133 



Crocodilus longirostris, Schneid. Amph. 160. Daudin, Kept. 4293. Blainv. Osteog. Crocod. t. 2. f. 4j 



t. 3. f. 6, t. 4. f. C, t. 5. f. 5. 

 Crocodilus arctirostris, Daud. Rept. ii. 393. 

 Crocodilus tenuirostris, Cuvier, Ann. Mus. x. 1. 1. Tiedem. Amph. 1. 15. Wagler, Syst. t. 7. f. 111. 



Merrem, Tent. 38. 

 Gavialis gangeticus, Geoff. Mem. Mus. xii. Gray, Syn. Rept. 36; Cat. Tortoises &c. B. M. 57. 



Dum. & Bib. Erp. Gen. iii. 135, t. 26. f. 2. Huxley, Journ. Proc. Linn. Soc. Zool. iv. 



p. 20, 1859. Briihl, Skelet. Krokod. t. 8, 9, 10, 11, & 17. 

 Crocodilus gangeticus, Tied. Oppel, & Libosch., Naturg. Amph. 81, t. 14. Geoif. Mem. Mus. H. N. 



xii. 118. 

 Gavialis longirostris, Merrem, Amph. 37. 



Gavialis tenuirostris, Merrem, Amph. 38. Guerin, Icon. R. Anim. t. 2. f. 3. 

 Ramphostoma tenuirostre, Wagler, Nat. Syst. Amph. 141, t. 8. f. 3. 

 Le gavial, Lacep. H. N. Q. Ovip. i. 235, t. 15. 

 Gavial, Owen, Monogr. Fossil ReptiUa of the London Clay, t. 11. 1849 (skeleton). 



Ilab. Indian rivers. Bengal, Nepal, Malabar. 



2. TOMISTOMA. 



9A QQ 



Beak of the head conical, thick at the base. Teeth jgr^- The mandibular sym- 

 physis extends to the fifteenth tooth ; the hinder tooth of the upper jaw, and most of 

 those of the lower jaw received into interdental pits. Premaxillary hardly expanded, 

 orbital margins not raised. 



Gavialis, sp., Miiller ; Owen. 



Tomistoma, S. Miiller, Wiegm. Arch. 1846, i. 122. 



Rhynchosuchus, Huxley, Journ. Proc. Linn. Soc. Zool. iv. p. 16, 1859. 



The upper edge of the intermaxillary bone extends back as far as the second canine 

 tooth ; and in this character it differs from the skull of the slender-nose Crocodiles, as 

 Croc, gravesii and Medstops cataphractus. 



Dr. Falconer, when describing the skull of Crocodilus cataphractus, in Ann. and Mag. 

 Nat. Hist. 1866, xviii. 362, observes, " Crocodilus schlegelii constitutes the passage 

 from the true Crocodiles into the Gavials," and he shows how the skull agrees with the 

 Crocodiles' in the position of the nasal bones. 



Professor Owen, in the first ' Essay on the fossil reptiles of the London Clay,' Crocodiles, 

 p. 15, observes, " The Bornean species, Crocodilus schlegelii, was in fact originally de- 

 scribed as a new species of Gavial ; but the nasal bones, as in the fossil from Sheppey 

 (figured in t. 2. £ 5), extend to the hinder border of the external nostrils." This does 

 not agree with our skull, nor with the figures of the skull in Blaindlle's ' Osteogi-aphie.' 

 See also Huxley, Journ. Proc. Linn. Soc. Zool. iv. p. 18. 



VOL. VI. — PAET IV. 



