MUSEUM OF THE NATURAL HISTORY SOCIETY. 237 



disturbed beds of the Lower Compact Limestone ; but at Clax- 

 heugh, on the "Wear, it rests also on the bed of Incoherent Sand, 

 the compact limestone being denuded or entirely absent. 



Localities. — At Down Hill near West Boldon, near Hylton 

 Castle, and at Claxheugh (these places are all on the escarp- 

 ment), High Barns, Humbleton Hill, Elstobs, Tunstall Hill 

 near Sunderland, Ryhope Field House, Dalton-le-Dale, Castle 

 Eden Dene. These places are situated in the middle portions 

 of the Magnesian limestone, as developed in the East of the 

 county of Durham. Near Castle Eden Dene it occurs in the 

 form of a conglomerate. See section " Greol. Trans.," II. ser., 

 Vol. III., pi. 7, f. 5, D. 



PLANTS, PLANTS. 

 ALG.&. 



Name and Locality. Reference. 



Palaeophycus insignis, Geinitz, Dyas, PI. 24, f. 4. 

 Loc— Tunstall Hill. 



ANIMALIA. 



FORAMINIFERA. 



Trochammina pusilla, Geinitz, Perm. Foss., PL 6, f. 7; 



Loc— Humbleton Hill. PI. 18, f. 13. 



SPONGIA. 



Eudea tuberculata, King, Perm. Foss., PI. 2, 



Loc. — Humbleton Hill and Dalton-le- f. 1, 2. 



dale. 



Mammillopora mammillariSjiTwy, Perm. Foss., PL 2, 

 Loc— Humbleton Hill. f. 3, 4. 



Bothroconis plana, King, Perm. Foss., PL 2, f. 7- 



Loc— Tunstall Hill. 



Tragos Tunstallensis, King, Perm.Foss.,P1.2,f.5. 



Loc— Tunstall Hill. 



