318 Canadian Record of Science. 
The specimens to which these notes refer are, with very — 
few exceptions, in the Museum of the Geological Survey at 
Ottawa, and in the enumeration of the different. species it 
has not been thought either necessary or desirable to quote 
all their synonyms and references, but only such as are 
most likely to be useful to Canadian students. 
RAPHISTOMA LENTICULARE. 
Pleurotomaria lenticularis (Sowerby) Hall. 1847. Pal. St. N. York 
vol. 1, p. 172, pl. xxxviii, 
fig. 6. 
us if sf Owen. 1844. Geol. Rep. Iowa, 
Wisc. and Minn., p. 86, 
pl. xviii, fig. 6. 
Pleurotomaria Americana, Billings. 1860. Can. Nat. and Geol., vol. 
v1, p. 164, fig. 7. 
Pleurotomaria lenticularis (Sowerby) Nicholson. 1875. Rep. Palzeont, 
Prov. Ont., p. 19, fig. 7d. 
Raphistoma lenticularis, Whitfield. 1882. Geol. Wiscons., vol. Iv, p. 
214, pl. vi, figs. 4 and d. 
Lower Fort Garry, D. Dale Owen, 1848. Cat Head, 
Lake Winnipeg, T. C. Weston, 1884: one specimen. Birch 
Island, Kinwow Bay, Lake Winnipeg, T. C. Weston, 1884, 
one specimen, and Messrs. Dowling & Lambe, 1890, two 
specimens. One or two specimens of this species, also, 
were collected by Messrs. Dowling & Lambe in 1890 and 
1891, at the Dog’s Head and at Commissioners (or Cran- 
berry), Snake, and Little Tamarack islands, Lake Winnipeg. 
All the specimens collected at these localities are badly 
preserved casts of the interior of the shell. They are 
obviously conspecific with the fossils from the Trenton lime- 
stone of the States of New York and Wisconsin, which 
Professors Hall and Whitfield have identified with the 
Pleurotomaria lenticularis of Sowerby. Similar, but some- 
times better preserved specimens, are common in the Tren- 
on limestone of Ontario and Quebec, and in the Hudson- 
River formation of the Island of Anticosti. 
Salter, however, in 1859, expressed the opinion that the 
