THE 



GEOLOGICAL MAGAZINE. 



NEW SERIES. DECADE II. VOL. IX. 



No. VI.— JUNE, 1882. 



I. — Contributions to the Palaeontology of the Yorkshire 



Oolites. 



By Wilfrid H. Hudleston, M.A., F.G.S. ; 



President Geologists' Association. 



{Continued from page 205.) 



(PLATE VI.) 



Chemnitzia, etc. 



I MUST refer to Memoir No. 1 — Corallian Gasteropoda — for remarks 

 with respect to the so-called Chemnitzias. The curious group, 

 of which " Terebra vetusta," Phil., may be regarded as the type, is 

 also very doubtfully placed under Chemnitzia. 



11. — Chemnitzia lineata, Sowerby, 1821. Plate VI. Figs, la, 



lb, 2, 3. 



1821. Melania lineata, Sow., Min. Conch, pi. 218, fig. 1. 



1829 & 1835. Melania lineafa, Sow., Phillips, G. Y. p. 129. 



1842. ? Melania procera, Deslongchamps, Mem. Soc. Linn. Norm. vol. vii. p. 223, 



pi. 12, figs. 5 and 6. 

 1852. ? Chemnitzia procera, D'Orb., T. J. p. 41, pi. 239, figs. 2, 3 (under the name 



of turris). 

 1852. Non Chem. lineata, D'Orb., T. J. p. 43, pi. 239, figs. 4 and 5. 

 1875. Chemnitzia lineata. Sow., Phillips, G. Y. p. 257. 



Bibliography, etc. — The complete synonymy of this very common, 

 variable, and widely-spread " species " would be about the most 

 hopeless task which any one could undertake to compile. This 

 Chemnitzia is very abundant in the I. 0. of Normandy, where, out of 

 the very pretty pictures given by Deslongchamps, perhaps two lead- 

 ing forms might be selected, of which we may regard this as repre- 

 senting one, and Melania coarctata the other. In a fit of despair, 

 MM. Hebert and Deslongchamps, whilst criticizing the attempts of 

 D'Orbigny to set matters to right, declare that it is almost impossible 

 to distinguish between "les Ch. heddingtonensis, procera, coarctata 

 et normanniana : il vaudrait peut-etre mieux les reunir toutes en 

 une seule espece, qui serait alors commune a I'oolithe inferieure, a la 

 grande oolithe, et a I'Oxfordien," ^ Mr. Tawney considers that there 

 are two species or at least good varieties at Dundry, and he is dis- 

 posed to separate Ch. lineata, Sow., from Ch. procera, Desl.^ I 

 1 Heb. et Desl. op. cit. p. 34. 2 Dundry Gasteropoda. 



DECADE I. — VOL. IX. ^NO. VI. 16 



