198 

 Trochonbma umbilicatum, Hall. (Sp.) 



Pleurotomaria unibilicata, Hall 1847. Pal. N. York, vol. I., pp. 43 and 175, 



pi. 10, figs. 9, a-6, and pi. 38, figs. 1, a-g. 



TroohonemauTnbilicatum, Saiter 1859. Geol. Surv. Canada, Can. Org. Rem., 



Dec. I., p. 27, pi. 6, fig. 3. 



Billings 1863. Geol. Canada, p. 145, fig. 92. 



Ulrioh and Scofield. 1897. Geol. Minn., Final Rep., vol. III., 

 pt. 2, p. 1047, pi. 77, figs. 1-8. 



A few specimens which have been identified with this species by E. 

 Billings, and which are still in the Museum of the Survey, were collected 

 at Limestone (now known as Clark's) Point, on the west shore of Lake 

 Winnipeg, about eleven miles north of the Little Saskatchewan, by Mr. 

 John Fleming in 1858. These specimens, however, are distorted and 

 badly preserved casts of the interior of shells, which are dilEcult to 

 distiaguish from those of closely related species. Similar casts have 

 been collected at the same locality by D. B. Dowling in 1890, and at 

 an exposure on the Little Saskatchewan River, one mile from Lake 

 Winnipeg, by Dr. R. Bell in 1875. Single specimens, which are too 

 imperfect to be determined specifically, but which are probably referable 

 either to this species or the next, were collected at Lower Fort Garry 

 and at Dog Head by T. C. Weston in 1884 ; at Little Black and Snake 

 islands by D. B. Dowling and L. M. Lambe in 1890; and at Commis- 

 sioner's Island by Mr. Dowling in 1890. 



Trochonema eccentbicum, Ulrioh and Scofield. 



Trochonenia eccentricum, Ulrioh and Sco- 

 field 1897. Geol. Minn., Final Rep., vol.111., 



pt. 2, p. 1049, pi. 77, figs. 17 and 18. 



A distorted specimen, but with most of the test preserved, which 

 agrees very well with the description and figures of this species, was 

 collected from a loose piece of limestone on the south end of Reindeer 

 Island, Lake Winnipeg, by D. B. DowHng, in 1890. 



Trochonema niota. Hall. (Sp.) 



Pleurotomaria niota, Hh,11 , 1861. Geol. Surv. Wiscons., Rep. Progr. 



1861, p. 33 ; and Whitfield (1895), Mem. 



Am. Mus. Nat. Hist., vol. I., pt. 2, p. 60, 



pi. 8, fig. 11. 

 JVooAonemo mioto, TJlrich and Scofield 1897. Geol. Minn., Final Rep., vol. III., 



pt. 2, p. 1052, pi. 76, figs. 16-18. 



A cast of the interior of a shell which agrees fairly well with Professor 

 Whitfield's and with Ulrich and Scofield's recent figures of this species, 

 was collected at Stony Point, a little to the north of Jackfish River, on 

 the west shore of Lake Winnipeg, by Mr. Weston in 1884. Two similar 



