Dr. FiTTON on the Strata below the Chalk. 30 J 



Reptiles. Bone of a Saurian. Great Hazeley : in ferruginous stone. 



\_Portland Sand.'\ 



Ammonites biplex. Oxf. : Dropshot, near Thame, in grey sandy limestone, with 

 numerous green particles, and small pebbles of quartz, Bucks : Dunton, in 

 greenish stone, with dark particles ; Quainton, with a Trigonia. 



A— giganteus. OxI. : Dropshot, (very large specimens) : in dark grey lime- 

 stone, with green particles and pebbles of black chert*; Shotover; in grit. 

 Bucks: Brill; Whitchurch; Dunton; in greenish grey stone, with dark par- 

 ticles. Quainton. 



A- ? Dunton, Bucks : in greenish grey stone, with dark particles. 



Avicula. Oxf: Shotover, with Serpula and a Pullastra? in sparry grit. Bucks: 

 Whitchurch ; large, a cast. 



Buccinum naticoide. PI. XXIII. f. 4. Brill : a cast. 



Cardiiim dissimile. Oxf. : Langcombe ; Dropshot, casts, in matter almost wholly green. 

 Bucks: Hartwell Lodge, with Trigonia gibbosa, in bluish grey stone ; Dunton ; 

 Brill, with Serpula ; Whitchurch; Muswell Hill ; Quainton. 



Cythercsa ? rugosa. PI. XXII. f. 13. Hartwell, Bucks. 



Gastrochcena. The Warren, near Stewkley, Bucks: and Shotover Hill, Oxf. : in 

 Perna quadrata. 



Lucina. Village of Stone, Bucks. 



Mylilus (probably a new species). Denton Village, Oxf. : with Trigonia clavellata. 

 Brill, Bucks. 



Ostrea solitaria. Dunton, Bucks. 



O . Species indistinct. Shotover, Oxf , with Serpula, &c. adhering to Ammonites 



giganteus^ and bent into its inequalities. Brill, Bucks. 



Panopcea ?. Whitchurch, Bucks. 



Pecten lamellosus. Dunton, Bucks : in greenish grey stone, with dark particles : and 

 in a mass almost entirely composed of green matter (silicate of iron), with Perna 

 quadrata. Muswell Hill ; Brill ?. 



P . Another species ?. Shotover : with Serpula, &c. 



Perna quadrata. Oxf. : Dropshot, near Thame, in dark grey limestone, with nu- 

 merous green particles and pebbles of black chert; Shotover, in sparry grit, 

 perforated by Gastrochaena ; with a Venus. Bucks : Muswell Hill, in stone ; 

 containing green particles; the Warren; with Gastrochaena, in grey stone; 

 Dunton ; in a green friable mass, and in greenish stone, including fragments 

 of black flint, with Pecten lamellosus. 



Plagiostoma obliquatum. Near Thame, Oxfordshire. 



P • rusticum. The Warren near Stewkley : in bluish grey stone, with minute 



dark particles. 



* At the quarries in the Portland-sand at Barley Hill near Thame, imperfect worn casts of 

 several bivalves, in black flint or chert, are found in the sandy stone, along with pebbles of the 

 same substance. 



