180 Dr. FiTTON on the Strata below the Chalk. 



strous reptile have hitherto been found chiefly in the upper part of the Has- 

 tings sands at Tilgate Forest : but very large bones, belonging, as it now 

 appears, to the same animal, have been obtained much higher up in the Weal- 

 den series, at Loxwood, and Headfold wood, in Western Sussex*: and very 

 recently, even beyond the limits of the Wealden group, among the lower 

 strata of the Green-sand, near Maidstone, (as already intimated, p. 132; notef): 

 they occur also as far down as in the Great Sand-bed of the cliffs on the 

 coast near Hastings, where that stratum reappears on the shore west of St. 

 Leonard's. I am requested by Mr. Mantell to state, that the mass of remains 

 from Maidstone confirms the appropriation to this reptile, which he had pre- 

 viously made, of other bones of great size found detached, and in different 

 places; and that, among other new points in the osteology of this extraordinary 

 creature, the Maidstone specimen has enabled him to ascertain that certain 

 phalangeal bones which approach to the mammalian character, — with flattened 

 claw-like extremities, resembling those of land-tortoises, — belong to the hind 

 feet of the Iguanodon ; while the fore feet of the creature appear to have been 

 long and slender, like those of the recent Iguana. 

 In addition to the Saurian remains which can be referred to distinct genera, 

 there are also in Mr. Mantell's collection, detached bones, probably belonging 

 to new or nondescript reptiles. 

 Birds. Fragments of some long bones found at Tilgate, and at first supposed to 

 have belonged to Pterodactyles, appear to be really those of a bird, probably a 

 species of Ardea. (Mantell, S. E. of England, p. 283.) 

 Fishes. The fishes of the Wealden, especially of the two upper members, have 

 hitherto been imperfectly collected ; and it still remains to be determined to 

 what species of this tribe many of the remains which frequently occur in the 

 Weald clay are to be referred. All the specimens from this formation in the col- 

 lections of the Geological Society, of Mr. Mantell, and Mr. Martin, have been 

 recently examined by Mr. Agassiz, with a view to his work on Fossil Ichthyology, 

 now in progress ; and the following are some of the genera to which he has re- 

 ferred them. 

 Pycnodus microdon. Teeth. (Represented in Mantell's Tilgate : PI. XVIII. f. 26, 



and 27.) 

 Hyhodus grossicomis. Teeth. (Ibid. PI. V. f. 14, and XV. f. 2.) 



. Two other species, not yet figured. 



. The dorsal defences referred by Mantell to a Silurus, (Ibid. PI. X. f. 4, 



and f 6.), Mr. Agassiz considers as belonging to an Hybodus. 

 Lepisosteus. (Lepidotus, Agassiz.) The remains of one or more species of this 

 genus have long been known, as diffused throughout the Wealden ; in every 

 part of which detached scales and fragments of the scale-covered surface are 

 very commonly found. The Teeth are represented in Mantell's Tilgate fossils, 

 PI. X. f. 2. ; the scales, in PI. X. figs. 3, 4, 15, and 16; and from an examination 



* Murchison : Geol. Trans. 2nd Series, vol. ii. pp. 104, 105. 



