Dr. FiTTON on the Strata below the Chalk. 299 



Impressions of verj/ narrow leaves. Great Hazeley, Oxf. ; in fissile clay, re- 

 presenting, probably, the Fuller's earth of the Lower green-sand. 



Trees. At Brill, the trunk of a large tree converted into lignite, was found 

 in bluish grey clay. A most remarkable specimen, 40 feet long ; at first entire, 

 with numerous branches ; but when I saw it, split into small fragments from de- 

 composition of the pyrites. 



Wood. Coniferous, silicified wood, precisely like that of Portland, is found 

 in fragments, in the " Malm", at Garsington, above the Portland stone, and 

 along with portions of freshwater limestone. 



[Portland Stone,'] 



Ammonites hiplex. Road near Walton turnpike, Bucks. 



A giganteus. Oving and Dinton, Bucks : with Exogyra nana, in sandy 



stone. 

 A— . Langcombe, Oxfordsh. Great Hazeley, Oxf. : in grey concreted sand. 



The Warren, near Stewkley, Bucks : in limestone. 

 Area (new). Stone-pits west of Great Milton : a cast in oolitic stone. 

 Astarte cuneata. Beneath Garsington, Oxf. : in concretional stone. Brill, Bucks: in 



hard compact limestone. 

 Bticcinum naticoide. PI. XXIII. f. 4. Whitchurch, Bucks. The Warren near 



Stewkley ?. 



B . Quainton. 



Cardium dissimile. Quainton, Bucks. Brill. Long Crendon : a cast, in grey, very 



sandy stone. Bishopstone, Moreton's pit : a cast. Tring, road near Walton 



Turnpike. The Warren near Stewkley. 

 Cytherea^. rugosa. PI. XXII. fig. 13. Southwarpe, Bucks. 

 ExogT/ranana. Dinton; Bucks : with Ammonites giganteus: in sandy stone. 



E . Whitchurch : adhering to Pecten lamellosus. 



Gastrochcenah Denton, Oxf. : perforating Perna quadrata. Garsington : with Pecten 



lamellosus ?. 

 Gervillia avicidoides. Langcombe, near Oxford : in calcareous spar. 

 Gri/ph(^a dilatala. Langcombe. A young shell ; in Portland stone ?. 

 Lucina Portlandica. PI. XXII. fig. 12. Southwarpe, Bucks. 

 Morf/o/a (large). Denton, Oxf. Whitchurch, Bucks : in white stone. 

 Mi/tilus. Whitchurch. 



iVfl<2ca elegans. PI. XXIII. f. 3. Great Hazeley; a cast. 

 Ostrea expansa. Bucks : Village of Stone ; Whitchurch, with Pecten lamellosus ; 



Quainton; Brill; Horton's pit, near Ford ; the Warren near Stewkley, Bedf. 

 . Remains of a thick-shelled species are found at Great Hazeley, Oxf.: in con- 

 cretions of gritty stone, in yellowish sand. Haddenham, Bucks. Dinton, with 



Plicatula. 

 PanopcBa depress a. Brill. 

 P gibbosa. Brill : a cast. 



