THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTOEY. 



[FIFTH SERIES.] 

 No. 120. DECEMBER 1887. 



LIT. — On " Ortlioceras [Endoceras] duplex," Wahlenberg 

 et auctt.f with Descrijytions of three new Species of Endo- 

 ceras _/ro??2 the Ordovician of Sweden and Russia contained 

 in the British Museum [Natural History). By ArTHUR 

 H. FooRD, F.G.S. 



'; 



There are a great many specimens of Endoceras in the 

 British Museum from Sweden, Northern Germany, and 

 Russia, bearing upon their labels the well-known name of 

 '■'■ Orthoceras dujylex^'' Wahlenberg. But on referring to the 

 original description of that species *, which is unaccompanied 

 by any figures, one finds that it is insufficient for purposes 

 of strict identification, and, in point of fact, many diverse 

 forms of Endoceras have consequently been united under 

 Wahlenberg's appellation. The essential part of his descrip- 

 tion is contained in the following passage, translated from 

 the Latin original :— 



'■'■ Orthoceratites duplex or giganteus is found in Westro- 

 gothia, and there only complete and well developed, particu- 

 larly in Mount KinnekuUe, The diameter is mostly a hand's 

 breadth, and sometimes as much as five Parisian inches, a 

 size of the tube surpassing that of any other univalved many- 



* Nova Acta Reg. Soc. Scient, Upsaliensis, 1821, vol. viii. p. 86. 

 Ann, ds Mag. N, Hist. Ser. 5, Vol. xx, 28 



