MUSEUM OP TUE NATURAL HISTORY SOCIETY. 247 



MOLLUSCA. 



Name and Locality. Reference. 



Solemya biarmica, de Vern., Trans. T. K F. C, 



Loc. — "Westoe near South Shields, near Yol. 3, PI. 11, f. 8, 

 Sunderland. 



Solemya normalis, Howse. Trans. T. IS". F. C, 



Vol. 3, PI. 11, f. 7. 



Myacites lunulata, {Keyserling) Mon. Perm. Foes., 



Loc.— Whitley Quarry. PL 16, f. 3-5. 



Pleurotomaria antrina, {Schloth.) Mon. Perm. Foss., 

 Loc— Tynemouth Cliff. PL 17, f. 1-8. 



Turbo helicinus, {Schloth.) Mon. Perm. Foss., 



Loc— Westoe near South Shields. PL 16, f. 19-26. 



Ghemnitzia Rossleri, Geim'tz. Dyas., PL 11, f. 9, 10. 



Loc. — Hartley Quarry, near Sunderland. 



Nautilus Frieslebeni, Geinitz, Mon. Perm. Foss., 



Loc— Whitley Quarry. PL 17, f. 13-20. 



pisces: 



Palaeoniscus Frieslebeni, P. compiles, Ag., Perm. 



Loc — Down Hill near Boldon, Hough- Foss., PL 21, f. 1. 



ton-le-Spring. 



Platysomus striatus, Ag., Mon. Perm. Foss., 



Loc. — Pallion Quarry, near Sunderland. PL 27; PL 28, f. 1. 



AMPHIBIA. 



Lepidotosaurus Duffi, Han. et Bowse, Nat. Hist. Trans., 

 Loc. — In lowest limestone, Midderidge. Yol. 4, p. 219, PL 8. 



Marl- slate. 



German equivalent : — Kupferschiefer. 



The Marl-slate is a very thin and comparatively a local de- 

 posit, as it is not always present in natural sections or in coal 

 sinkings through the limestone, and it thins out and disappears 

 in the South of Durham. It seldom exceeds a yard in thickness, 

 and is, when well protected, of a dark grey colour approaching 



