WHITEAVE8.] DEVOJ^IAN FOSSILS, MACKENZIE RIVER BASIN. 245 



this genus is represented by two sijecimens. These are both much too 

 imperfect for identification oi- description, but they clcurly iniiio.ate the 

 existence of two distinct species of Orthoceras in the Devonian rooks at 

 this locality. 



(i YROOERAS. 



A well preserved portion of what seems to have been the body cham- 

 ber of a small, nodoso and apparently undescribed species of Gijroceras, 

 was obtained by Mr. McConnell, in 1888, on the Mackenzie Eiver, at 

 the " Eock by the river side." In this specimen the sides are ex- 

 panded, the venter and dorsum compressed, and the outline of the 

 transverse section is obscurely octagonal, with the two angles on the 

 dorsal side obsolete. The surface markings consist of distant nodes, 

 arranged in longitudinal and transverse rows, and connected in both 

 directions by obscure ridges. In each transverse row there are six of 

 these nodes. 



On the Peace Eiver, at Vermilion Falls, a very imperfect cast of a 

 considerable portion of the interior of the shell of the outer volution of 

 another and very different species of Gyroceras was collected by Mr. 

 McConnell in 1889. This specimen, which is of considerable size, seems 

 to be most nearly related to the G. suhmamillatum, from the Devonian 

 rocks of Lake Winnipegosis,* and may possibly be referable to that 

 species, though it does not show any indications of a row of large and 

 low rounded promiences on either of its sides. 



GONIATITES. 



Plate .■31, fig. 5. 



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

 cast of the interior of three chambers of the septate portion of the shell 

 of a species of Goniatites, in which only the lateral lobes and saddles 

 are preserved, each ventral lobe being completely obliterated by 

 weathering. So far as can be ascertained from such an imperfect 

 specimen, the species appears to have the closest atfinities with the 

 G. Ixion of Hall,f from the (loniatite limestone of Eockford, Indiana, 

 which is the type of Hyatt's genus Brancoceras. 



* Trans. Royal Soc. Caniida for 1890, Sect, iv, p. 107, pi. x, figs. 1 and la. 

 t Pal. St. N. Y., vol, V, pt. 2, p. 474, pie. hxiii, figs. 12-14 and Ixxiv, fig. 12, 



May, 1891, 



