FAUNA OF THE TRENTON GROUP. 
29 
I 
This species is important, as it is one of the most common and 
conspicuous fossils of the Cobourg formation. Though not confined 
to that part of the Trenton, it is most common there, and its presence 
should always lead to a search for other species indicative of the 
upper Trenton. 
Genus, Fusispira Hall. 
Fusispira nobiiis "Ulrich and Scofield. 
Plate YIII, Figure 12. 
Fusispira nobiiis Ulrich and Scofield. Pal. Minn., vol. 3, pt. 2, 1897 r 
p. 1078, PL 80, figs. 2-4, Schuehert, Proc. U.S. Hat. Mus. r 
vol, XXII, 1900, p, 168. 
This species is very characteristic of the upper Cobourg, and is- 
espeeially common along the southern edge of the outcrop of the 
Trenton in Prince Edward county, Ont. Originally described from 
Minnesota, it has only recently been reported from the more eastern 
exposures, but is also found in Hew York. 
Genus, Pterotheca Salter. 
Pterotheca angusta sp. nov. 
Plate YIII, figure 8. 
It is proposed to designate by this name a small Pterotheca 
which Mr. Whittaker and the writer collected from the highest layers 
of the Cobourg at Collingwood. It is peculiar in having a sharply 
angular, median ridge and in the narrowness of the internal platform, 
the lines bounding it converging at an angle of about 60 degrees, 
whereas in other species observed by tbe writer, that angle approxi- 
mates 90 degrees. The kpecimen shows no sort of surface markings, 
beyond the usual longitudinal ridges, a very high, sharply angular 
median one, with two low gently convex ones bounding it. 
The length is 16 mm., and the width is estimated to have been, 
about the same. 
Class, Trilobita Walch. 
Genus, Eoharpes Raymond. 
Eoharpes Ottawaensis (Billings). 
Plate IX, figure 1. 
Harpes Ottawaensis Billings. Pal. Foss. Can., 1865, p. 182, fig. 165V. 
For further references see Bassler, Bull. 92, U.S. Hat. Mus.,~ 
1915, p, 488. 
A photograph of the type of this species was published in an 
earlier number of the Bulletin of the Victoria Memorial Museum, but:; 
