265 



This species differs from B. ahruptus, in having the glabella proportion- 

 ally shorter. 



The pygidium, fig. 249, supposed to be that of this species, is nearly 

 flat, and very much resembles that of a Bronteus. It is nearly semi- 

 circular, width not quite double the length ; axis small, convex, conical, 

 not quite half the ■whole length, with four or five obscure annulations; 

 side lobes nearly flat, with four wide ribs. The anterior rib has a short 

 pleural groove close to the anterior margin next the axis, and another at 

 about the middle of its width, but in the outer half of its length. The 

 other ribs are undivided, and curve backwards, so that the posterior two 

 (consisting of one from each side) are parallel with the median line. 



Only one specimen of the head of this species has been observed. The 

 pygidium appears to be somewhat common. 



Locality and Formation. — F, G, and H, Keppel Island, Port aux Choix, 

 and Table Head, Newfoundland ; Quebec group. 



Collector. — J. Richardson. 



Bathyurellus nitidus. (N. sp.) 



Fig. 249. — Balhyurellus nitidus. Drawn from a partially rolled-up specimen. 

 250. — B. formosus. The eyes in this figure are a little too large. 



Description. — Oblong ovate. Head convex, with a wide concave bor- 

 der ; front uniformly rounded ; posterior angles apparently without spines. 

 Glabella conical, strongly convex, its outline on a side view forming a 

 gradually rising arch from the front to the mid-length, then nearly hori- 

 zontal to the neck furrow, the latter narrow and slightly impressed ; dorsal 

 furrows distinctly defined, but narrow all round ; sides straight and parallel 

 for half the length, then gently curving forwards to form a somewhat pointed 

 apex. Eyes large, lunate, half the length of the glabella, their posterior 

 ends about half their own length from the posterior margin of the head ; 

 their anterior ends a little in advance of the mid-length of the glabella. 

 They are distant about their own width from the sides of the glabella, or 



