CROCODILES. 357 



III. — Memorandum by Dr. Falconer on Crocodilus Schlegelii. 



The Crocodilus Schlegelii is not a true Gavial, but a Crocodile. 

 1. The cranial tablet, instead of being square to behind the orliits 

 converges on either side. 2. The crotaphite foramina are smaller than 

 the orbits considerably. 3. The nasals descend so as to join on with 

 the long wedge apophyses of the intermaxillaries, whereas in the Gavial 

 they are separated, and are a third of the entire length of the muzzle. 

 The cranial tablet in C. Schlegelii has very much the form as in the 

 figure of C. lucius in Cuvier's ' Ossemens Foss.' 4. The upper wedge- 

 shaped terminations of the intermaxillaries are larger and more slender 

 than in Gavial. 5. The outer border of the orbits do not overhang the 

 maxillaries as in the Gavial, but are within them as in the Crocodiles. 

 6. The greatest diameter of the orbit is not transverse as in Gavial, but 

 lengthwise, and the form is very much as in C. bipoi-caius. 7. There 

 is no considerable contraction behind the fifth tooth of the muzzle in 

 the upper jaw as in Gavial, and no appearance of the great enonarrhine 

 cartilaginous sac of Gavial. In C. Schlegelii the anterior ends of the 

 palatines terminate in a line with the great palatine holes, while in 

 the Crocodiles they descend in slips between the palatine portion of 

 the maxillaries, as also in the Gavial. 



The form of Croc. Schlegelii agrees very closely with that of C. 

 Journei, described by Bibron and Dtuueril. In C. Schlegelii there a,ve 

 twenty teeth in the upper jaw and nineteen or twenty in the lower. In C. 

 Journei there are eighteen in the upper and only fifteen in the lower. The 

 length of head in an old C. Schlegelii is to its greatest width as 2g^ to 1, 

 which is exactly the same proportion as in C. Journei. Width at anterior 

 border of orbits ^ nearly in C. Schlegelii, and ^ in C. Journei; opposite 

 ninth tooth in C. Schlegelii ^ to \, in C. Journei \ at tenth tooth ; tip 

 of muzzle in C. Journei g-, in C. Schlegelii ^ to -g-. (But the dimensions 

 of muzzle in C. Schlegelii vary with the age. The muzzle is longer in 

 proportion to its diameter in the young than in the old animal.) The 

 longest teeth in C. Journei are the first, fifth, and tenth, in upper jaw, 

 and the first and fourth in lower. In C. Schlegelii tliey are the first, 

 fifth, and ninth, in upper jaw, and the first and fourth in lower. 



IV. — Descriptions by Dr. Falconer of Fossil Remains of Crocodiles, 



FROM AVA, PeRIM IsLAND, AND THE NeRBUDDA, IN THE CATA- 

 LOGUE OF THE Museum of the Asiatic Society of Bengal. 



The following firom the Sewalik hills are most noteworthy [Ed.] : — 



No. 642. Leptorhynclius Gangeticus. — Finefragmentof cranium with- 

 out the lower maxilla, deficient only from the muzzle portion in front 

 of the orbits; the whole of the occipital region with the occipital 

 condyle nearly entire. The transverse articular surface of the tym- 

 panic bone and a part of the squamous portion adjoining removed; the 

 cranial tablet perfect, as also the two crotaphite foramina, together with 

 both orbits; palatines shown underneath, but pterygoids broken off. 

 The alveoli of only three small teeth shown on the broken part of the 

 right maxilla. The contraction of the muzzle, the form of orbits, their 

 elevation above the frontal, the cranial tablet, and the form and pro- 

 portion of the crotaphite foramina to orbits and the other adjoining parts, 



