OF CAPE BRETON AND NEWFOUNDLAND. 153 
the former; nevertheless, it bears slender spines on certain rings of the thorax after the 
manner of the latter species. 
2.—AGRAULOS AFFINIS, Billings. 
24, 

Fic. 2.—Agraulos afinis, Bill—Centre piece of the head shield. Mould of the interior of 
the test, showing the glabellar furrows more distinctly, and the occipital spine 
more acuminate than they appear on the outer surface of the test. 
Natural size. 2a. Same seen in profile. 2 b. Same seen in front. 
This species is too near the last to be readily distinguished, except by comparison of 
examples of the two species. Mr. Billings gives the following description of the species, 
but no figure :— 
“ This species is closely allied to A. socialis, and is of the same size, but differs in the 
following respects: the glabella is broader and, with the sides, gently convex. The 
eyes are somewhat nearer the sides of the glabella. The whole of the anterior portion 
in front of the glabella is convex. The dorsal furrows are more distinctly impressed all 
around the glabella. It occurs at Branch, St. Mary’s Bay.” 
Besides the points of difference named by Mr. Billings, there are others which separ- 
ate this species from the preceding. This has a shorter and more obtuse occipital spine, 
and the front of the shield is more strongly arched vertically; the course of the facial 
suture is more sinuous, and the eyelobe more prominent; the facial suture also is more 
broadly rounded, and curves in toward the posterior margin. 
The length of the centre piece of the head shield is 11 millimetres, the width 15 mm., 
and the height about 4 mm. 
The above notes are made on the type specimens of this species, now in the collections 
of the Geological Survey at Ottawa. 
3.—AGRAULOS STRENUUS, Billings. 
Sv 
3.a. 

FiG. 3.—Agraulos strenuus, Bill—Narrow form. Centre piece of the head shield. Inner 
surface. The glabellar furrows are not so sharply cut on the outside of the test, nor 
are the dorsal furrows. 3 a. Head shield seen in profile. 3 b. Same seen in front. 
Mr. Billings described in the following terms a trilobite from the limestone of Brigus, 
in Conception Bay, under the above name :— 
“ Head (without the moveable cheeks) irregularly quadrangular; broadly rounded in 
front. Glabella rather strongly convex, conical, variable in its proportional length and 
width, either smooth or with several obscure impressions on each side, representing the 
Sec. IV., 1886. 20. 
