﻿JURASSIC AND TRIASSIC BRACHIOPODA. 



81 



Clay. The correctness of this view is confirmed by the presence of the Lingula and 

 Discina in question side by side, in an admirable state of preservation, in undoubted 

 Kimmeridge Clay at Netherfield, near Battle, in Sussex, and obtained at various depths 

 during the Sub-wealden boring operations in 1873, 1874, and 1875. 



In the British Museum may be seen two slabs of Kimmeridge Clay from Braunston, 

 in Northamptonshire, containing the Discina under description. Some very large 

 examples, more or less crushed, were also obtained by the late Mr. C. B. Rose from the 

 Kimmeridge Clay of West Norfolk. Mr. Blake states this shell to have been found in the 

 Upper Kimmeridge of Eulletby in Lincolnshire, and several other localities ; also in the 

 Lower Kimmeridge of Oxfordshire with doubt. 



At page 134 of his " Catalogue of British Fossils," Prof. Morris quotes this species 

 from the Oxford Clay of Scarborough and Elberston. I am not, however, acquainted 

 with any specimens from that formation. 



9. Discina elevata, Blake. Sup., PI. XI, fig. 31. 



Discina elevata, Blake. Quart. Journ. Geol. Soc, vol. xxxi, p. 231, 1875. 



Spec. Char. Upper or dorsal valve oval, apex elevated, excentric, outer surface marked 

 with fine concentric lines. 



Length about 4 lines, by 3 in breadth. 



Obs. As stated by Mr. Blake, this species is easily distinguishable from D. latissima 

 and D. Humphresiana, on account of its much smaller dimensions, more oval form, and 

 not showing any of those radiating lines or striae observable in D. Jluu/phresiana. I have 

 not seen the ventral valve. 



D. elevata is said by Mr. Blake to be moderately common in the Lower Kimmeridge 

 of Lincolnshire, but difficult to be obtained in a perfect condition, for when the 

 clay splits, part of the shell always remains on one half, and the rest on the other. 



10. Discina Humphresiana, Sow. Dav., Ool. Mon., p. 10, PI. I, fig. 3, 3 a, b, and 



Sup., PI. XIII, figs. 17 to 19. 



Discina Humphresiana, Sow. E. Desl. Etudes Critiques sur des Brachiopodes 



nouveaux ou peu connus, p. 36, pi. vi, figs. 

 12—14, 1862. 



At the period when Sowerby described this pretty species, the upper valve only had 

 been discovered. Since that time, in 1862, Mr. E. Deslongchamps was so fortunate as 

 to find some complete specimens attached to Ostrea delioidea in the Kimmeridge Clay at 



11 



