and the adjoining Parts of Hants and Surrey . 105 



MegalosauruSj the specimens of that animal in my possession are too few to 

 enable me to decide. All that I can state is as follows. The vertebra No. 8, 

 found near the great femur, does not appear to be of the same species with 

 the others. No. 2 is probably a lumbar vertebra. No. 4 may be a sacrum. 

 Nos. 1, 3, and 6, are certainly caudal vertebrae. No. 6, which (as you will 

 observe) consists of two united into one, is remarkable for presenting an an- 

 chylosis of two caudal vertebras : and No. 6 was disposed to become anchy- 

 losed to No. 3. I have just examined all my skeletons of reptiles, and have not 

 found any analogous case, except when the tail has been broken; and then the 

 bones become united by exostosis, which is not the case with these specimens. 

 Hence it would seem, that this must have been an animal making such feeble 

 use of the tail, that the caudal vertebrae were occasionally anchylosed together. 

 No. 3 is one of the first caudal vertebrae, viz. of those which support the largest 

 chevron -shaped bones ; for the articular tubercles of these bones are very 

 strongly marked upon it. No. 11 (not here figured) is the articular apophysis 

 of a vertebra. Nos. 5 and 10 (not figured) are probably portions of ribs. As 

 to No. 7, the rugosities of its two extremities, which evidently terminated upon 

 cartilage, indicate that it did not belong to a limb ; and it can therefore only 

 have been either^ false rib or a branch of the os hyoides." 



Before receiving the preceding communication from Baron Cuvier, through 

 the kind assistance of Mr. Mantell I had compared these remains with the 

 bones from Tilgate Forest found in the same formation ; but as no teeth or 

 specimens sufficiently marked and peculiar have yet been met with at Lox- 

 wood, I was not able to establish any case of identity between the bones from 

 these two localities. 



The vertebrae are of a very uncommon form, being highly contracted in the 

 middle with sharp angular sides ; and of their two extremities, the one is nearly 

 flat, the other concave : hence it appears probable that they are not referrible 

 to the Iguanodon of Mr. Mantell, nor to any of the hitherto discovered sau- 

 rians of Tilgate Forest. 



In concluding the geological view of this district, I beg to observe, that if 

 Loxwood be taken as a centre, a section to the south presents a similar suc- 

 cession of strata to that which is developed on either side of Harting Combe, 

 with the addition in the former case of the iron-sand. The river A run, in its 

 course from the Weald, passes through the lower green-sand, the gault, the 

 malm-rock, and the chalk of the South-downs ; whilst a section to the north, 

 exposes principally the green-sand, between which and the chalk of the Hog's 

 Back the intervening formations are reduced almost to imaginary lines. 



VOL. II. — SECOND SERIES. P 



