JURASSIC AND TRIASSIC BRACHIOPODA. 205 



able difference in the distribution of the species of Oolitic Brachiopoda in the Somer- 

 setshire and Dorsetshire areas. As compared with the Cheltenham districts, many 

 species very common in the one district are either very rare or altogether wanting in 

 the other. 



199. Rhynchonella sub-ringens, Dav. Ool. Mon., p. 75, PI. XIV, figs. 17, 17 a, b, c. 

 Nothing new. Inferior Oolite, Somersetshire. 



200. Rhynchonella Bouchardii, Dav. Ool. Mon., p. 82, PI. XV, figs. 3 — 5 ; Sup., 



PL XXIX, fig. 19. 



This species occurs in a thin band of clay in the Upper Lias (zone of Amnion, 

 bifrons) in the neighbourhood of Ilminster. 



201. Rhynchonella oolitica, Dav. Ool. Mon., p. 81, PI. XIV, fig. 7. 

 Nothing new. Pea-grit, Inferior Oolite, Cheltenham district. 



202. Rhynchonella Porbesii, Dav. Ool. Mon., p. 84, PI. XVII, fig. 19. 



Rhynchonella Forbesii, Dav. Proc. of the Nat. Hist, and Antiquarian Field Club, 



pi. \v, fig. 15, 1877. 



Several characteristic specimens of this small globular species have been collected by 

 Mr. D. Stephens from the Inferior Oolite of Bradford Abbas, in Dorsetshire. 



203. Rhynchonella concinna, Sow. Dav., Ool. Mon., p. 88, PI. XVII, figs. 6-^12; 



Sup., PI. XXVII, fig. 22. 



This species occurs chiefly in the Great Oolite and Stonesfield Slate near Oxford, and 



