Dr. FiTTON on the Strata below the Chalk. 



181 



of these, and of some very fine specimens of the head and fore part of the fish, 

 belonging to Mr. Martin, Mr. Agassiz has been led to divide the genus into 

 two species, distinguished by the forms of the teeth. 



Coprolite, — (or, more correctly, masses of phosphate of lime approaching to the 

 form, and possessing many of the chemical characters of Coprolite,) has been 

 found by Mr. Martin in cavities on the surface of the Weald-clay, at Stopham 

 brick-yard, near Pulborough, but so mixed with fossils of the Lower green- 

 sand that the whole may probably have belonged to that formation. The re- 

 cent discovery of the Iguanodon, near Maidstone, forms an additional link of 

 connexion between those two formations ; and coincides with other evidence 

 which indicates the probable continuity of their deposition. 



REMAINS OF PLANTS. 



ACo7ieo(an unknown species, (PI. XXII. f. 10.), remarkable forthe double prominence, 

 or ridge, in most of the scales; (see Appendix No. 1.) : in a mass of hard, greenish 

 grit. From a quarry on the estate of Henry Shirley, Esq., at Pippingford in 

 Ashdown Forest, very near the highest point of the ridge of the Hastings sands. 



Eiidogenites erosa. (Plates XIX. and XX.) Described in the preceding sections (85.) 

 to (89.). Tilgate Forest : M. Coast west of Hastings : F. In the first course of 

 sand in the Weald-clay, near Mulsey's Farm, about l\ miles north-east of Pul- 

 borough, on the main road to London : Martin. 



Sphenopteris gracilis : represented in the subjoined wood-cut. See the descriptive note 

 in the Appendix A, p. 349. From beds of sandrock and slaty clay, in the quar- 

 ries at Huntley's Farm near Tunbridge Wells, above the great bed of White 

 sandroek : Rev. W. L. Pope. 



