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have been met with, and especially so in the Shell-limestones of Tunstall Hill, Humbleton' 
Hill, Ryhope Eield House, Dalton-le-Dale, and in the Lower Limestones at East Thickley, 
Crakehall, and Tynemouth ; but, as a rule, the same species occur in these two divisions 
of the Permian system. Very few species are found in the Marl-slate, Lingida Credneri 
and Discina Koninckii being the only species of Brachiopoda with which I am acquainted. 
Discina Kojiinchii has been also found in the Lower Limestone of High Side Bank, 
Crakehall, and East Thickley, while Lingula Credneri has likewise been obtained from 
the Lower Limestone of East Thickley and Crakehall. 
Froductus horridus, Strophalosia Goldfussi, Terebraiula elongaia, and Camarophoria 
crnmena appear to be the most abundant and characteristic species, occurring in the 
largest number of localities. F. horridus is stated to occur likewise at Dodiddle's Quarry, 
near Laughton-en-le-Morthen (see ' Memoir on Geology of Quarter Sheet, 82, N.E.,' 
p. 12), and near Sleningford, north of Ripon (see Jos. Lucas " On the Permian Beds of 
Yorkshire," ' Geol. Mag.,' vol. ix, p. 342). At Nosterfield the narrow variety of Frod. 
Jwrridics is found in swarms, but somewhat dwarfed. 
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