326 Canadian Record of Science. 
species of the genus. On page 238 of the first volume of 
the “Paleozoic Fossils” of Canada, H. Billings distinctly 
states that there are no muscular processes on the inner side 
of the operculum of his J. oceana, and on page 243 of the same 
volume he figures opercula of two other species of Maclurea, 
from Cape Norman, Newfoundland, in which there are no 
muscular processes on that side. In the Museum of the 
Geological Survey at Ottawa, there are two opercula from 
the Calciferous of the Mingan Islands, which were referred 
by E. Billings, with some doubt, to the MZ. matutina of 
Hall. There are no processes on the inner side of these 
opercula. 
LOXONEMA WINNIPEGENSE. (Sp. nov.) 
Shell large, attaining to a length of upwards of five 
inches, terebriform, elongated and nearly three times as 
long as broad: spire, as measured on the dorsal side, 
occupying not quite two-thirds the entire length: apical 
angle 27°. Volutions ten, allowing for the apical one, 
which is broken offin all the specimens collected, increasing 
slowly in size and obliquely compressed, the later ones 
slightly constricted above and moderately inflated below, 
those of the spire much broader than high: suture dis- 
tinctly compressed: outer or last volution a little higher 
than broad, moderately convex but scarcely ventricose in 
the middle and narrowing abruptly into the somewhat 
pointed base. 
Surface of the spire nearly smooth, that of the last volu- 
tion marked only with a few flexuous lines of growth, 
which curve gently and concavely backward above, and 
still more gently forward below. 
Four fine large specimens of this species, each with 
nearly the whole of the test preserved, have been collected 
at as many different localities on or in Lake Winnipeg. 
Two of these specimens were collected by Mr. Weston in 
1884, one at Stony Point and one at Jack Fish Bay; one by 
Mr. Tyrrell in 1889 at Berens Island; and one by 
Mr. Dowling in 1891 at the “ Dog’s Head.” 
