298 Dr. FiTTON on the Strata below the Chalk. 



M)/tilus Lyellii ? PI. XXI. f. 18. Bishopstone : Dr. Lee's pit. Near Whitchurch, 



on the road to Winslovv : numerous; in light greenish grey, alternating with 



dark, tough clay, over the top of the Portland strata. 

 M . Another species, smaller and narrower than M. Lyellii. Combe Wood, 



"Malm". Dinton, Bucks. Bishopstone. Horton's Pit ; in slaty soft limestone. 



Dr. Lee's pits. Weedon. Whitchurch. Quainton. 

 Ostrea expansa. Horton's Pit, Bucks. {Qua. in Portland-stone ?) 



O (thin-shelled). Combe Wood: "Malm". 



O (fragments of another species). Whitchurch, Bucks; in the " Pendle. " 



Garsington, Oxfordshire : " Malm ". 

 Paludina elongata. Combe Wood, and Garsington: in the "Malm"; casts, with 



Cypris. Soulhwarpe, Bucks. Bishopstone, pit near Morton's. 

 P Impressions of another species ? Southvvarpe, Bucks. Horton's Pit : in 



freshwater limestone. Quainton: in the grey uniform grit; Quce. Hastings 



sand. 

 P (a ribbed species). Garsington and Combe Wood, Oxfordshire: in the 



"Malm". 

 Planorbis. Garsington and Combe Wood, Oxfordshire: casts in the "Malm"- 



Horton's Pit, near Bishopstone, Bucks. 

 Potamides carinatum. (Melanopsis, Min.Con.) Horton's Pit, Bishopstone, Bucks. 

 Psammobial. Garsington: "Malm". 

 Unio. Bishopstone, Dr. Lee's Pits: in soft bluish slaty stone. Quainton.* 



Fishes. Bones; impressions only. Southwarpe, Bucks : in soft earthy fissile lime- 

 stone. 



Vertebrae. Whitchurch, in freshwater limestone, " Pendle ". Coney Hill : 

 in calciferous grit. 



Scales. Bucks: Bishopstone, Ford, Horton's Pit, in oolitic stone: Dr. Lee's 

 pits; in soft bluish slaty stone. Whitchurch in the "Pendle", with worn 

 roundish particles. Quainton : pit top of the hill ; in the " Hardstone ". 



Reptit.ES. Portions of a spongy bone, probably Saurian. Garsington, Oxf. : in the 

 "Malm". 



Plants. A specimen, represented in PI. XXII. f. 11., the nature of which is still 

 doubtful. It was bought at Quainton, Bucks, and said to be from the stone-pits 

 at the hill-top; but the precise place was unknown. Not siliceous : effervescing 

 with acids ; and in this respect different from the Cycadeae of Portland. 



* Besides the shells above enumerated, tlie following were found in the strata representing the 

 Purbeck series, within the tract now under consideration; viz. Bivalves— iof two or three species 

 probably new, but too indistinct to be determined, — at Combe Wood, Oxfordshire; Bishopstone, 

 Weedon, VVliitcliurch and Quainton, Bucks. Spiral univalves — at Garsington and Combe Wood, 

 Oxfordshire, (specimens exhibiting beautifully the internal column of the shell); at Great 

 Hazeley, Oxfordi,hire, with oolitic particles; and on the road from Whitchurch to Winslow, 

 Bucks, — (a new Paludina ?) 



