MUSEUM OF THE NATURAL HISTORY SOCIETY. 



243 



Name and Locality. 



Chiton Loftusianus, King % 



Loc. — Humbleton and Tunstall Hills. 



Chiton Howseanus, Kirkby, 



Loc. — Tunstall and Humbleton Hills. 



Chiton cordatus, Kirkby, 

 Loc— Tunstall Hill. 



Chitonellus antiquus, (Hoiose) 

 Loc— Tunstall Hill. 



Reference. 



Mon. Perm. Foss., 



PL 16, f. 9-14. 

 Trans. T. N. P. C, 

 Vol.4, P1.13,f.3l-41. 



Trans. T. K". P. C, 

 Vol.3, PI. 1 2, f. 10-1 3, 

 Vol.4, P1.13,f.42-53. 



Trans. T. N. P. C , 

 Vol.4, PL 13,124-26. 



Trans. T. N. P. C, 

 Vol.4, PL 13,115-23. 



Chitonellus Hancockianus, Kirlly, Trans. T. K P. C, 



Vol.4, PL 1 3, f. 1-1 3. 



Trans. T. N. P. C, 

 Vol.4, PL 13,128-30. 



Perm. Poss., p. 218. 

 D. Speyeri, Gein., 

 Dyas, Pl.12,111-13. 



Trans. T. N. F. C, 

 Vol.3,Pl.ll,l27. 



Mon. Perm. Foss., 



Loc— Tunstall Hill. 



Chitonellus distortus, Kirlly, 

 Loc— Tunstall Hill. 



Dentalium Sorbyi, King, 

 ■ Loc— Tunstall Hill. 



Theca Kirkby i, Home, 

 Loc— Tunstall Hill. 



Nautilus Frieslebeni, Geinit%, 

 Loc — Tunstall and Humbleton Hills, etc PL 17, f. 13-20. 



Lower Limestone {Compact Limestone of Sedgivicl and others). 



Germ, equiv. — Unterer and Olerer compacter Zechstein. 



The Compact-Limestone forms, in most places along the Per- 

 mian Escarpment, as it ranges from near South Shields through 

 the county of Durham nearly to Pierce Bridge, an elevated plateau 

 of considerable height and importance. The beds of limestone 

 are thin-bedded, compact bluish-grey or mottled, becoming occa- 

 sionally brown, earthy, cellular, and with thicker beds towards 

 the top. When exposed and quarried near the outcrop, the beds 

 are thin, hard, and knobby, and the entire thickness of the beds 

 is fissured and intersected with numerous perpendicular fissures 



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