267 



Locality and Formatmi. — P, Cow Head, Newfoundland; also, in a 

 boulder near Quebec, with SahuUtes Psyche and other fossils ; Quebec 

 group. 



Collector. — J. Richardson. 



Bathyurellus fraternus. (N. sp.) 



Fig. 251. 



Fig. 252. 



Fig. 251. — Bathyurellus fraternus. a, the glabella ; 6, the pygidiiim. 

 252. — B, validus. The pjgidium. 



Description. — Head strongly convex, with a narrow concave border. 

 Glabella conical, onlj slightly elevated above the general convexity of the 

 head in the anterior two-thirds, rather strongly elevated in the posterior 

 third, slightly narrowed between the eyes, greatest width at about two- 

 thirds the length from the neck segment, thence with gradually converg- 

 ing sides to the apex which is pointed or very angularly roundetl. Dorsal 

 furrow linear, but distinctly visible all round the glabella. Eyes semi- 

 circular, their anterior angles situated just behind a line drawn across the 

 glabella at the mid-length, their centres distant from the sides of the gla- 

 bella about their own length. No neck furrow is visible in the specimen, 

 but this part is badly preserved. 



The pygidium, found associated with the glabella above figured, is very 

 nearly semicircular, moderately convex, and with a narrow deeply concave 

 margin all round. The axis a little less than one-tliird the whole width at 

 the front margin, and moderately convex, but becomes gradually less pro- 

 minent backwards, until it merges into the general surface at about two- 

 thirds or three-fourths the length. It is crossed by four linear grooves, 

 but the segments between the grooves are scarcely at all elevated. The 

 side lobes have also four obscure grooves, all terminating at the dcc])ly 

 concave marginal border. 



Length of the head 13 lines ; length of the glabella lOi lines ; greatest 

 width of the glabella, at one-third the length from the apex, G lines ; 



