176 Dr. FiTTON on the Strata below the Chalk. 



mass, a little decomposed, shows, within a cavity, a somewhat circular band, 

 exhibiting organic structure, which is probably tubular* ; and the same kind 

 of structure is indicated in the other figures, 4. and 4. a, which are taken 

 from a transparent slice belonging to Mr. Stokes ; the latter being a more 

 highly magnified portion of fig. 4. 



(90.) Fossils of the Wealden. — The catalogue of the organic remains of 

 Sussex, published by Mr. Mantell in the last volume of these Transactions, 

 and which he has stated to have been intended to accompany these pages f, 

 renders it unnecessary to insert here the fossils of that portion of the Wealden. 

 The following list, therefore, will contain such species only as have been 

 found in the tracts described in the preceding pages of this paper, or as do 

 not occur in Mr. Mantell's catalogue : and I have been enabled to add se- 

 veral species to those of my own collection, through the kindness of Lord 

 Greenock, Mr. Hills, Mr, Martin, and especially of Mr. Mantell. 



List of Fossils of the Wealden, in Kent, Surrey, Hants, and Western 



Sussex^. 



Bulla Mantelliana. PI. XXII. f. 3. With Unto antiquus, within a cavity in the grit 

 ofTilgate Forest: M. 



Corhula alata. PI. XXI. f. 5. Pounceford near Burwash, Sussex : M. 



Ci/clas angulata. PI. XXI. f. 12. Weald clay : M. 



C major. PI. XXI. f. 13. Weald clay, in nodules of clay iron ore, with Cypris 



Valdensis and Paludina elongala, Hythe (Kent) : F. With Cypris, fish-bones, and 

 pyrites, in iron ore; upper part of the Weald clay, near Pulborough : Martin. 

 Henhurst, near Ockley, Surrey ; in Weald clay. With Faludina fuviorum in 

 thin bands of very hard ferruginous calcareous grit, passing into ferruginous 

 sand ; near the top of the Weald clay on the west of Leith-hill, Surrey : F. 



Ct/das media. (Cyrew« wze^/m, Ann. of Phil. Vol. VIII. p. 376. Cydas media, Min.. 

 Con. Tab. 525. f. 2.) PI. XXI. f. 10. So generally diffused throughout the 

 Wealden strata that the specification of localities is hardly required. The fol- 

 lowing are some of the circumstances under which this shell has been found. 

 In coarse grit near the top of the Weald clay, at Atherley, south of Tanhurst, 

 Surrey. In very compact uniform grit, with thin carbonaceous vegetable im- 

 pressions, — shell calcareous : also in very fine-grained micaceous sand-rock, with 



* In this figure, from the greater difficulty of representing the opake object, the partitions between 

 the dark spots which denote the cavities of the tubes, are much too wide : the real proportion of 

 the cavity to the partition is more correctly expressed in fig. 4. a. 



t " A Tabular Arrangement of the Organic Remains of the County of Sussex." Geological 

 Transactions, 2d Series, vol. iii. p. 215. 



X In this list the letter M. denotes that the specimen is in Mr. Mantell's collection; F. in that of 

 the author. 



