88 BRITISH OOLITIC AND LIASIC BRACHIOPODA. 



Cretaceous, where the species has not hitherto with certainty been found. It made its first 

 appearance in the Inferior Oolite, specimens from Leckhampton Hill, near Cheltenham, 

 being undistinguishable from many of those so abundantly found in the Oxford Clay of 

 Wooton Basset, and Shotover Hill, near Oxford, as well as with some derived from the 

 Kimmeridge Clay of Weymouth. 



I am not prepared to admit, with Professor Bronn, 1 that Sowerby's species is a 

 synonym of that described by Lamarck in 1819, under the appellation of Ter. difformis; it 

 is certain that the last-named author's type was taken from a shell found in the Cretaceous 

 or Tourtia beds of Tournay, in Belgium; 2 those figured in the 'Ency. Meth.', PI. 242, 

 fig. 5, a b c, being likewise from the Cretaceous beds of France, as justly observed by 

 M. D'Orbigny. 3 



There exists certainly much general similarity between some specimens of R. difformis 

 and R. inconstans; but when adult and well characterised, the last seems easily distin- 

 guished by its more circular form, greater convexity, and stronger plaits; the Cretaceous 

 species being more delicate in general appearance, not so convex, much wider than long, its 

 plaits smaller, and its foramen larger and tubular. As justly observed by Baron von Buch, 

 the plaits in the R. inconstans are always simple, and do not bifurcate. It is found also 

 in various parts of the continent, as in Normandy, near Namers, Ellrichserbring in 

 Brunswick, Allem, and in other parts of Germany. 



Plate XVIII, fig. 1 . The largest specimen I have noticed, in the collection of the British 



Museum, from the Oxford clay of Wooton Basset. 

 ,, figs. 2, 3. Two specimens from the Kimmeridge clay of Weymouth, in 



the collection of Mr. Bowerbank. 

 ,, fig. 4. From the Inferior Oolite of Leckhampton Hill, in the collection of 



Dr. Wright. 



82. Rhynchonella concinna, Sow. Sp. Plate XVII, figs. 6 — 12. 



Terebratula concinna, Sow. Min. Con., vol. i, 1812, p. 192, tab. lxxxiii, fig. 6. 



— rostrata, Sow. Ibid., vol. vi, 1829, p. 67, tab. 536, fig. 1, (not 



Cretaceous.) 

 flabellula, Sow. Ibid., vol. vi, 1829, p. 67, pi. lxvii, pi. 535, fig. 1. 



— concinna, V. Buch. Uber Terebrateln, 1834 ; and Mem. Soc. Geol. de 



France, vol. iii, 1838, p. 144, pi. xiv, fig. 14, et T. rostrata, 

 Me'm. Soc. Geol. de Fr., vol. iii, p. 155, pi. xv, fig. 27. 



— — Morris. Catalogue, 1843. 



1 Index Pal., pp. 1235 and 1238. 



2 Dav., Notes on an Examination of Lamarck's Species of Fossil Terebratula. ' Annals and Mag. of Nat. 

 Hist.,' June, 1850. 



3 Palseontologie Francaise, Ter. Cretace'es, vol. iv, p. 41. 



