wHiTEAVEs] DEVONIAN FOSSILS, MACKENZIE RIVER BASIN. 241 



Pal.5;oneilo. (Sp. Undt.) 



Athabasca Eiver, first ten miles below the mouth of the Clearwater, 

 Dr. E. Bell, 1882 : a cast of the interior of the closed valves of a nar- 

 rowly elongated species of this genus, shewing impressions of numerous 

 cardinal teeth. 



The specimen is much too imperfect to be identified, but it seems to 

 have been very similar in shape to the P. attenuata of Hall,* from the 

 "Waverly Group of Ohio. 



Paracyclas elliptica, Hall. 



Paracydas elliptica, Hall. 1843. Geol. Surv. N. Y.. Eep. Fourth Distr., p. 171, 



t. 67, fig. 2. 

 Lmma elUjiHca, Billings. 1859. Hind's Rep. Assinib. and Saskatch. Expl. Exp., p. 



187, fig. Id. 

 Ludna {Paracyclas) elliptica, Hall, var. occidentalis. Hall and Whitfield. 1872. 



Twenty fourth Eeg. Eep. N. Y. St. Cab. Nat. Hist., p. 189. 

 Paracyclas elliptica, Hall. 1885. Pal. N. Y., vol. V, pt. ], Lamellibr., pt. 2, p. 440, 



pi Ixxvii, figs. 23-33, and pi, xcv, fig. 18. 



Hay Eiver, forty miles above its mouth, E. G-. McConnell, 1887 ■ three 

 specimens. Mackenzie Eiver, at the '' Eamparts," (five specimens), 

 and ten miles below Bear Eiver (one specimen) ; E. G. McConnell, 

 1888. 



All the specimens collected are more or less well preserved casts of 

 the interior of the closed valves. Those from the Mackenzie Eiver 

 belong to the large and rather inflated form of the species which Pro- 

 fessor Hall once separated as the variety' occidentalis, but specimens 

 precibely similar to these are abundant in the Corniferous limestone of 

 Ontario. The sjjecimens from the Hay River arc (juite small. 



ScHizoDUS Chemungensis, Conrad. 

 Plate 30, figs. 5, 5a. 



Nuculites Chemungensis, Conrad. 1842. .lourn. Ac. Nat. Sc. Phil., vol. VIH, p. 247, 



pi. xiii, fig. 13. 

 Scliizodus Chemungensis (Conrad) Hall. 1870. Prelim. Not. Lamellibr., 2, p. 90. 



" 1885. Pal N. Y., vol. V,pt. 1, Lamellibr., 



pt. 2, p. 453, pi. Ixxv, figs. 37-40, 45, 41. 



Hay Eiver, forty miles above its mouth, E. G-. McConnell, 1887 : a 



* See Pal. St. N. York, vol. V, pt. 1, Lsimellibr. , ii, 1885, p. 346, pi. I, ligs. 31-39. 



