34 CONTaiBUTIONS TO CANADIAN PAL^DONTOLOGT. 



Inoceramus SaCiEnsis, var. JSTebrascensis, Owen. 



Inoceramus Sagcnsis, Owen. 1S52. Geol. Rep. Miu., Iowa and Wiseons., p. 582, 



pi. 7, fig. 3. 

 Inoceramus Nebraccnsis, Owen. 18.52. Hd., p. 582, pi. 8, fig. 1. 

 Inoceramus Sagensis, var. Nehrascends, ^leek. 1876. Rep. U.S. Geol. Surv. Terr. 



vol. IX., p. 52, pi. 13, figs. 2a, b. 

 Inoceramus Sagensis, Whitfield. Pal. Black HiUs Dakota, p. 393,, pi. 7, fig. 12, 



and pi. 8, fig. 2. 



St. Mary Eiver, about ten miles from its mouth, G. M. Dawson, 

 1881 : one rather large but imperfect sjjecimen which closely resembles 

 Owen's iigure of the type of /. Sagensis. South Saskatchewan, oppo- 

 site Swift Current Creek, E. G. McConnell, 1882 and 1883 : three very 

 large specimens, two of which are ujjwards of a foot in length, by 

 fully fourteen inches in height, as measured obliquely in the direction 

 of the main axis of the valves. 



In the largest individuals the concentiic undulations become obsolete 

 in the basal or anterior two-thirds of the shell, and the test, which is 

 only about two millimetres thick near the ventral margin, is nearly 

 smooth, and only faintly and concentrically striated on its outer sur- 

 face. The outline of the largest and most perfect of the Swift Current 

 specimens, which appear to belong to the variety Nebrascensis, is 

 singularly like that of Sowerby's figure of I. latus, Mantell, in vol. VI,, 

 p. 159, tab. 182, fig. 1 of the Mineral Conchology. 



Inoceramus tenuilineatus, Hall and Meek. 

 Plate 5, figs. 1 and 1 a. 



Inoceramus tenuilineatus, Hall and Meek. 1854. Mem. Am. Ac. Arts and Sci. 



Boston, vol. VIII., p. 387, pi. 2, figs. 3a, b. 



Meek. 1876.^ Rep. U.S. Geol. Surv. Terr., vol. IX. p. 57. 



pi. 12, fig. 6. 

 Inoceramus tenuilineatus, Whitfield, (as of H. and M.) Pal. Black Hills Dakota 



p. 400, pi. 9, figs. 12, 13. ' 



Blood Indian Creek, longitude 110° west,— also Elbow of the South 

 Saskatchewan Eiver, Prof. J, Macoun, 1819 : two fine specimens, which 

 belong to that form of the species in which the concentric undulations 

 are unusually strong and well-defined, from each of these localities. 



