FAUNA OF THE TRENTON GROUP. 
31 
Genus, Remopleurides Portlock. 
Bemopleurides striatulus Walcott. 
Plate IS, figure 7. 
Bemopleurides striatulus Walcott. Oin. Quart. Jour. Sc., 2, 1875, p. 
347, fig. 27 A, a,b. 
An hypostoma of this exceedingly rare trilobite is figured merely 
to call attention to a new locality for the 3pecies. The specimen is 
13 mm. long and 6 mm. broad at the widest point. The prongs are 
9 mm, long, and each shows two strong longitudinal striations, with 
one or two subordinate ones at the proximal end. The type ha3 more 
numerous striations. 
Horizon and Locality. Found !by E. J. Whittaker in the Praso- 
pora zone at Trenton, Ont. At least one cranidium of this species 
has been found at Governor bay, near Ottawa. 
Genus, Bathyurus Billings. 
Bathyurus ingalli Raymond. 
Plate IX, figures 3-5. 
Bathyurus ingalli Raymond, Bull. Yic. Mem. Mus. 1, p. 57, PL VII, 
fig. 7, 1913. 
Only the cranidium was known at the time this species was 
described. Since then Mr. Whittaker has fortunately discovered a 
pygidinm and a free cheek at the type-locality. 
The pygidinm proves to be very similar to that of B. spiniger. 
It is small, short, and highly convex, with a long, erect, stout spine 
which curves backward. This spine arises somewhat farther back 
than the one on B. sphnger; there are two rings on the axial lobe in 
front of it, before reaching the articulating half-ring, instead of only 
one as in B. spiniger. The pleural lobes show four pairs of rounded 
ribs and the border is narrow, smooth, and concave, faintly marked 
by the ribs as in most species of Bathyurus. 
The free cheek figured, which is really only the impression of 
the exterior of the left cheek, seen from the inside, is broad with a 
wide concave genal spine. There are slight traces of pustules just 
outside the eye, but there does not seem to be so large a patch as iB 
present in this position in B. spiniger . 
The pygidium is 7 min. long and 16 mm. wide at the front, but 
is somewhat shortened by crushing. The spine is 9 mm. long and 
