31 
The ornamentation is preserved only on one small section, but it 
shows the notched lip of Lophospira and the lines of growth sweeping back 
toward the band both above and below the carina. Of the Upper 
Ordovician species described L. occidentalis most nearly resembles L. 
tropidophora, but differs from it in having more and narrower whorls, 
a rounded rather than projecting lower part of the lip, resulting in a different 
cross-section of the whorl. The same differences are more pronounced 
between L. occidentalis and L. perlamellosa and the tendency to have 
a convex rather than a concave slope above and below the carina differ- 
entiates L. occidentalis from most other species of the genus. 
Horizon and Locality. Richmond: Beaverfoot. On the slope east 
of Palliser pass, Rocky mountains, B.C. 
VERMES 
Cornulites parvus n. sp. 
Plate VIII, figure 1 
A small, parasitic Cornulites growing separately on the inside of the 
brachial valve of a Dinorthis. Slightly flexuous, largest specimen mm. 
in length, the minute tip being lost under a piece of some foreign body 
attached to the shell. Walls very thin. Annulations, seven in number, 
more sharply rounded on the lower edge than on the upper, trough between 
not quite as wide as the annulations and almost flat bottomed. Very fine, 
longitudinal striae which continue to the apex. One tiny specimen, 3 mm. 
in length, has the annulations worn off, so that they appear as bands 
around the tube, about the width of the spaces between. 
Hall 1 considers that all the species of previous authors cited by him 
from the Upper Ordovician of Indiana and Ohio are only different forms 
of one species. The Rocky Mountain species, however, differs from it 
in the width of the space between the annulations and the continuation 
of the striae from the embryonic stages. 
Horizon and Locality. Richmond: Beaverfoot. Eleven hundred and 
fifty feet east of the trail, Palliser pass, B.C. 
CEPHALOPODA 
Actinoceras complanum n. sp. 
Plate VIII, figures 3, 4 
Shell distinctly flattened on the ventral side, otherwise oval in outline. 
At one point having a lateral diameter of 39 mm. and a dorso-ventral 
diameter of 30 mm. Tapering gradually, in a length of 32 mm., the lateral 
diameter diminishes from 40 mm. to 37 mm. Surface not retaining any 
markings. Siphuncle very large, occupying most of the interior of the 
shell, in contact with the ventral wall. Septa about 6 mm. apart. Septal 
neck curving downwards for half the depth of the chamber, meeting the 
connecting ring which occupies the lower half and extends 3 mm. into the 
camera beyond the point of juncture with the septal neck. 
1 Pal. New York, vol. VII, Sup., p. 12 (1888). 
21216 — 35 
