208 R. B. Newton — On the Genus LeveilHa. 



Leveillia {Ammonites) primordialis* ScUotheim, 1820. Petrefactenkunde, 



1820, p. 65.— Merkwiirdige Versteinerungen, 1832, pi. ix. fig. 2, p. 16. 



(?) Schizostoma carinatum, F. A. Ecemer, 1850. Beit. geol. Kenntniss nord. 



Harz. 1850, pi. v. fig. 28, p. 38. 



Locality. — Winterton, near Grund, Harz. Eomer's species appears to be the 



immature form of L. primordialis. 



Leveillia {Bellerophon) radiata, D'Orbigny, 1838, Loc. cit. pi. 6, figs. 20-23, 

 p. 216. 

 Locality. — Eifel ; Eussia. 



Leveillia [Nautilites) Woodwardi, W. Martin, 1809, loc. cit. 



,, {Bellerophon) Woodwardi, J. Phillips, 1841. Fig. Desc. Palaeozoic 

 Foss. Cornwall, Devon, etc., 1841, pi. 40, fig. 201, p. 107. 

 Locality. — Newton, South Devon. 



Devonian (American). 



Leveillia {Porcellia) crassinoda, C. A. White and E. P. "Whitfield, 1862. 

 Observations upon the Eocks of the Mississippi Valley which have been 

 referred to the Chemung Group of New York, together with Descriptions of 

 New Species of Fossils from the same horizon at Burlington, Iowa. Proc. 

 Boston Soc. Nat. Hist. 1862, vol. 8, p. 303 (not figured). 

 Locality .—BMx]mgion, Iowa. 



Leveillia {Porcellia) Hertzeri, J. Hall, 1876. Illustr. Devonian Foss. 1876, 

 pi. xvi. fig. 24. Nat. Hist. New York (Palaeontology), 1879, vol. v. part 2, 

 pi. xvi. fig. 24, p. 126. 

 Locality. — Columbus, Ohio (Upper Helderberg). 



Leveillia {Gyroceras and Porcellia) nais, J. Hall, 1862. Descriptions of New 

 Species of Fossils from the Upper Helderberg, Hamilton and Chemung 

 Groups. Fifteenth Ann. Eep. Eegents New York, 1862, part D. pi. 6, 

 figs. 5, 6, p. 68. 

 Locality.- — Chemung Co. (Chemung Group). 



Leveillia {Porcellia) obliquinoda, C. A. White, 1862. Description of New 

 Species of FossUs from the Devonian and Carboniferous Eocks of the 

 Mississippi Yalley. Proc. Boston Soc. Nat. Hist. 1862, vol. ix. p. 21 (not 

 figured) . 

 Locality. — Burlington, Iowa (Chemung Beds). 



Leveillia {Porcellia) rectinoda, A. Winchell, 1863. Descriptions of Fossils 

 from the Yellow Sandstones lying beneath the ' ' Burlington Limestone ' ' at 

 Bm-lington, Iowa. Proc. Ac. Nat. Sci. Philadelphia, 1863, p. 18 (not figured). 

 Locality. — Biu-lington, Iowa. 



EXPLANATION OF PLATE VI. 



Fig. 1. Leveillia latidorsata (E. B. Newton), ventral view of specimen, showing 

 the nodulations and the wide umbilicus. The internal volutions are 

 much covered with matrix. 



Fig. 2. Dorsal view of same specimen showing the prominent ribs, the median 

 groove, and the strong marginal serrations. The shell fracture a short 

 distance from the margin of the mouth opening exposes impressions of 

 the ribs and groove in the matrix. 



Fig. 3. Internal section of another specimen of the same species showing the 

 thickness of the shell, the contiguity of the whorJs and its globular 

 nucleus. The figure also illustrates the monothalamous nature of the 

 genus. 



The figures are drawn of the natural size. 



