231 



Aparohites Billingsii, the Leperditia Billingsii of Jones, which was 

 supposed by its desoriber to be from the "Lower Silurian (Trenton?) 

 strata near (to the west of) Lake Winnipeg and north of Lake Superior," 

 is distinctly stated in Mr. S. J. Dawson's Report* to have been collected 

 from the "limestone of Lake Winnipegoos " {i.e., Lake Winnipegosis), 

 and is therefore either a Devonian or Silurian (Upper Silurian) species. 



TRILOBITA. 



Calymene senaeia, (Conrad) Owen. 



Galymene scmiria, (Conrad) Owen 1852. Rep. Geol. Surv. Wisoons., Iowa and 



Minn., p. 181. 



Lower Fort Garry, D. Dale Owen, 1848. No specimens of this species 

 have yet been recognized in any of the Survey collections of fossils from 

 the Winnipeg or Red River limestones, though it is possible that the 

 cephalon, minus the free cheeks, of a very small trilobite from the 

 Hudson River formation at Stony Mountain, which was referred to the 

 Calymene callicephala of Green, with some doubt, on page 128 of this 

 volume, may be referable to C. senaria. 



AsAPHus (IsoTELUs) Sus«, Whitfield. 



Asaphus Susce {Calvin, M. S.) Whitfield 1882. Geol. Wiscons., vol. IV., p. 236, pi. 5, 



fig. 3, and pi. 10, fig. 8. 

 Isotclus Susa; Clarke, 1894 1894. Lower Silur. Trilob. Minn, (advance 



copies fr. Geol. Minn., Final Rep., vol. 



III., pt. 2), p. 708, figs. 10 and 11. 

 Cfr. Asaphus platycephalus, as figured by E.Billings in Geol. Canada (1863), p. 184, fig. 



183 ; and in Cat. Silur. Foss. Isl. Anticosti 



(1866), p. 24, fig. 7. 



Lower Fort Garry, T. C. Weston, 1884; East Selkirk, A. McGharles, 

 1884 ; and Inmost or Birch Island, Lake Winnipeg, D. B. Dowling and 

 L. M. Lambe, 1890: one specimen from each of these localities. The 

 most perEect of these is the fine doubled up specimen from East Selkirk 

 kindly presented by Mr. McOharles, which shews most of one of the 

 large and very prominent eyes, but only very small portions of the crust 

 are preserved on any of them. A doubled up specimen of A. Sicsw, 

 labelled "Selkirk Settlement,! Donald Gunn (No. 1176)," and belonging 

 to the United States National Museum, has also been lent to the writer, 

 for comparison, by the authorities of that institution. Each of these 

 specimens agrees perfectly with the original description and figures of 

 A. Susce, especially in the very broadly rounded outer margins of the 

 glabella arid pygidium, and three of them show the rounding of the 



* " Report on the Exploration of the Country between Lake Superior and the Rea 

 River Settlement," Toronto, 1859, p. ,18. 

 + Practically the same place as Lower Fort Garry. 



