1915] PALAEOZOIC FossILs FROM HupsoN Bay. 67 
POLEUMITA HUDSONICA, Parks. 
Plate IV, Figures 1 and 2. 
POLEUMITA HUDSONICA, pars., Parks. Bur. Mines of Ontario, 22nd Rep., pt. I, p. 194, 
1913. 
In the preliminary report the specimen referred to this species was 
included with those which I have now removed to Euomphalus rotundus, 
leaving a single specimen as the type of the present species. This 
example is very badly preserved, but it seems to differ from any others 
in the collection and is worthy of a brief description, which must be 
regarded as provisional only. 
The fragment indicates a shell of about 56 mm. in maximum dia- 
meter; the body whorl is relatively very large with a height of about 
22 mm. The spire is very low and small. There are not more than 
three whorls in a complete shell. The specimen is a cast of the interior 
only and shows no ornamentation on the whorls of the spire, but the 
body whorl shows four prominent revolving ridges separated by shallow 
concavities of which the upper is broader, the middle medium and the 
lower narrowest. The upper surface of the body whorl is flat and 
apparently smooth; the lower surface is not revealed except in one 
small spot, where it also appears to be smooth. 
The low spire induces me to ascribe the species to Polewmita rather 
than to Gyronema, but the distinctness of the revolving ridges suggest 
a Trochonemoid shell. Although the specimen is very badly preserved, 
it is quite evident that it does not belong to any of Whiteaves’ species 
of Gyronema, and it is certainly distinct from any other specimen in 
the collection with the exception of one of the fragments referred pro- 
visionally to Gyronema speciosum. It is quite possible that this fragment 
belongs to the present species, in which case the under side of the body 
whorl should be ornamented with revolving striae much closer set than 
the prominent lateral ridges shown in the figure. 
Locality—Limestone rapids, Severn river, District of Patricia, Ontario. 
Horizon—Silurian. 
No. 371 S. Royal Ontario Museum of Palaeontology. 
STROPHOSTYLUS FILICINCTUS, Whiteaves. 
STROPHOSTYLUS FILICINCTUS, Whiteaves. Geol. Sur. Can., Ann. Rep., Vol. XIV, pt. F, 
P. 54, 1904. 
STROPHOSTYLUS FILICINCTUS, Whiteaves. Geol. Sur. Can., Palaeoz. Foss., Vol. III, 
pt. IV, p. 263, pl. 30, figs. 4, 5, 6, 1906. 
