Lacerta. reptiles. SAURIA. 153 



1. In the year 1791i M. G. A- Deluc communicated to Cuvier the calca- 

 neum of a crocodile from Brentford. It was found associated with the re- 

 mains of the extinct elephant, rhinoceros, &c. in the Lacustrine silt of that 

 district, one of the members of the modern or superficial strata. Baron Cu- 

 vier seems to consider it as having belonged to a species distinct from the re- 

 cent kinds. If it be also distinct from the other fossil species, and have not 

 been washed out of its original repository in some older bed, it must be con- 

 sidered as the most recent of the extinct species — Cuv. Ilech. v. 2. p. 169. 



2. In the clay of Sheppey, the jaw of a crocodile has been found, Webster, 

 Geol. Trans, ii. 194. Cuv. Rech. v. 2. 165 — In the tabular view of the fos- 

 sils of the London clay, in the Geology of England and Wales, it is stated, 

 " That the remains of a crocodile very nearly approaching to the characters 

 of existing species, and especially to the crocodile, a rtiuseau aigu, have re- 

 cently been discovered in the London clay at Islington." 



3. In the Geology of England and Wales, p. 172, it is said, " Mr John- 

 ston of Bristol possesses a very perfect head of a crocodile, found in Purbeck ; 

 but the character of the matrix is not quite decisive, as to whether it belongs 

 to these or to Portland beds." 



4. Baron Cuvier, Rech, v. 2. 161, notices the occuiTence of a crocodile in 

 the iron sand of Tilgate Forest, Sussex, and refers to Mr ManteU's Fossils 

 of the South Downs, p. 47' 



5. In the Geology of England and Wales it is stated, that " A well cha- 

 racterised crocodile, but of a species distinct both from those now known to 

 exist, from those found in a fossil state in Germany, and from one, at least, 

 of the French fossil species, has been dug up at Gibraltar, near Oxford, and 

 is now in the collection of that Univerisity ; it is from a bed towards the 

 upper part of this oolitic system, perhaps the Cornbrash," p. 208. 



6. The alum-shale of Whitbjs so fertile in organic remains, has furnished 

 the skeleton of a crocodile, a figure of which has been published by the Rev. 

 George Young, in the Edin. Phil. Journ. No. xxv. p. 76. tab. iii. In the 

 length of the snout it approaches the Gavial. Mr Young is disposed to con- 

 sider the skeleton found at Whitby in 1758, a drawing and description of 

 which, by Mr WooUer, appeared in the PhiL Trans. 1. p. 786. tab. xxx., as 

 probably belonging to the same species. 



II. Megalosaurus. — This genus was instituted by Professor Buck- 



land for the reception of the relics of an animal of great size, 

 found in the calcareous slate of Stonesfield, near Woodstock, 

 Oxford. It is of a mixed character, exhibiting resemblances 

 both to the Monitors and the Crocodiles. A portion of the jaw, a 

 femur, several vertebrae, and other bones of doubtful character, 

 have been procured. The portion of the jaw is straight. The 

 teeth are compressed, pointed, recurved, with the cutting edge 

 crenulated. They do not adhere to the jaw, but they are pro- 

 tected externally by its elevated margin. Length probably ap- 

 proaching 40 feet. — Geol. Trans. 2d Series, 1. tab. xl.-xliv. Mr 

 Mantill has found the remains of this animal (probably a dif- 

 ferent species) in the ironsand of Tilgate Forest. — Cuvier Rech. 

 V. 2. 343. 



III. Iguanodon. — This genus, was instituted by Mr Mantill, in a 

 paper read before the Royal Society of London, February 10. 



