REVISION OF SPECIES REFERRED TO GENUS BATHYURUB 
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border, glabellar furrows are entirely absent; and the eyes are 
somewhat farther forward. The pygidium is without concave 
border; the ribs of the pleural lobes are reduced to nodes; and 
the axial lobe is ringed for almost its entire length. 
Type: Batkyurus nero , Billings. 
Petigurus nero, (Billings). 
Plate VII, fig. 8. 
Bathyurus nero, Billings, 1865. Palaeozoic Fossils of Canada, 
Vol. I, p. 260, figs. 243 a-d. 
This species is covered by the generic description. The 
species is common at a number of localities on the western 
side of Newfoundland. 
Professor Reed has recently described a small, imperfect 
head-shield from the west of Ireland (Glensaul) as Bathyurus 
aff. nero. This specimen is of particular interest, as the genus 
Bathyurus has not previously been reported from Europe. The 
single specimen found agrees with P. nero. in having a tuber- 
culated glabella and neck ring, large eyes, and oblong glabella. 
It differs from that species, however, in having a wider and 
more nearly rectangular glabella, in the profile of the glabella, 
and in the position of the eyes, which are near the centre of 
the head in the Irish specimen. The most important differ- 
ence, however, is in the shape of the fixed cheek. The Irish 
specimen is incomplete, but, according to the figure, the posterior 
end of the facial suture turns sharply outward behind the eye, 
forming a broad fixed cheek. This is very different both from 
Petigurus nero and from any species of Bathyurus. 
* 
Petigurus cybele, (Billings). 
Bathyurus cybele, Billings, 1859. Canadian Naturalist and 
Geologist, Vol. IV, p. 366, fig. 12c. 
Very similar to P. nero. From the “White limestone” of the 
Beekmantown at the Mingan islands. 
