of Tilgate Forest in Sussex. 265 



Teeth of Squali or Sharks. Tricuspid teeth, longitudinally striat- 



ed ; differ entirely from those of the 

 chalk, and from those of the recent 

 species I have examined. 



Teeth of Spari and Anarhicas lupus ? Teeth of Spari and Anarhicas lupus ? 



small rounded teeth, very nume- 

 rous. Bony palates — unknown. 

 Bones of unknown animals. 



Shells Trigonice, BelemnitcB^ Ostrea, Shells of the genera Unio, Mactra, 



PectenitcB, PatellcB^ (marine). Paludina, Cyrena, (fresh-water). 



Ferns and reeds— not of the same spe- Ferns — 4 species ; reeds, 

 cies as those of Tilgate. 



Wood ? lignite, charcoal. Wood ? lignite, charcoal. 



Fuci, algae. Gigantic plants of the Palm tribe ; 



(Endogenites erosa). 

 Arborescent ferns — (Blathraria Lyel- 

 Hi). 



Carpolithi. Carpolithi. — not the same as Stones- 



field. 



Quartz-pebbles. Quartz-pebbles and boulders. 



A glanoe at the above lists will shew, that, although the gene- 

 ral resemblance of the organic contents of the two deposits is 

 striking, yet they actually agree but in few particulars. The 

 Stonesfield beds partake more of the character of a marine, and 

 those of Tilgate of a fresh-water formation. The prevalence in 

 the latter, of large terrestrial vegetables, of which the genera, at 

 all analogous (Cycas, Dicksonia, &c.), now exist in tropical re- 

 gions only ; and the absence of marine shells, particularly of Be- 

 lemnites and ammonites^ and also of zoophytes, seem to prove, 

 that the Hastings Sands (the name now given to the series of 

 sands and clays between the purbeck and the weald clay, and of 

 which the Tilgate strata form a part) have been deposited under 

 circumstances materially different from those which operated in the 

 formation of the Stonesfield slate. But, as a work on the Fos- 

 sils of Tilgate Forest will shortly appear, it is unnecessary to ex- 

 tend these remarks ; and I will only add, that, should the writer 

 of the " Observations,"" or any one interested in the subject, vi- 

 sit this part of England, he shall have free access to my cabinet ; 

 and it will give me pleasure to afford him every facility for an 

 actual examination of the strata of Tilgate Forest. 



Castle Place, Lewes, Sussex, 

 August 2. 1826. 



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