205 



iacross the head at the mid-length. There is a narrow wire-like rim all 

 ronnd the edge of the head. The cheeks and eyes rather strongly ele- 

 vated. Surface in some specimens smooth and in others tuberculated 

 except near the margin. 



Length of the head 6| lines ; width across the neck-furrow 11 lines ; 

 length of glabella 6^ lines ; width of the same 4 lines ; length of the eye 

 If Hne. 



Locality and Formation. — Near St. Antoine above Quebec, in a 

 boulder along with Suhidites Psyche : Quebec group. 



Collector. — J . Richardson. 



Bathyurus arcuatus. (N. sp.) 



Fig. 190. 



Description. — Head convex, broadly rounded in front, posterior angles 

 produced backwards forming long flat spines. Glabella convex, sub-anga- 

 lar along the middle, narrowed from the anterior third backwards, rounded 

 in front, nearly the whole length of the head. Neck furrow all across 

 the glabella and continued on the cheeks beyond the eyes. Neck seg- 

 ment moderately convex, projecting backwards in the middle. Eyes pro- 

 minent, reniform, one third the whole length of the head, close to the 

 neck furrow, about half their own length distant from the side of the gla- 

 bella. The margin of the head is thin and abruptly turned upwards in 

 front of the glabella, a concave space just within the edge extends all 

 round and is continued into the posterior spines. Surface of glabella and 

 part of the cheeks around the eyes tuberculated ; margin and spines ap- 

 parently smooth. 



Length of the largest head collected 4f lines ; width of the same at the 

 neck furrow 9f lines ; the cheek spines are about the length of the head. 



Locality and Formation. — Near St. Antoine above Quebec, in a 

 boulder with Subulites Psyche : Quebec group. 



Collector. — J. Richardson. 



Bathyurus perspicator. (N. sp. 



Fig. 191. 

 191. — B. perspicator. 



Description. — Head convex, broadly rounded and with a short rounded 

 projection in front of the glabcUa ; eyes large ; cheeks with short poste- 

 rior spines, directed a little outwards. Glabella large, nearly as long as 



