268 



length of the eye 3 lines. Length of a pygidium 9 lines ; width of the 

 same 15 lines. 



This species resembles B. nitidus, but differs therefrom in having 

 smaller eyes, a less convex glabella, and a narrower margin around the 

 front of the head. B.formosm has the glabella convex and elevated 

 above the general surface of the head. It is more difficult to distinguish 

 this species from B. validus. 



Locality and Formation. P, Cow Head, Newfoundland ; Quebec 

 group. 



Collector. J. Richardson. 



BATHYURELLUS VALIDUS. (N. sp.) 



Fig. 252. 



Description, The form of the glabella and fixed cheeks of this species 

 are the same as those of B. fraternus. The head is strongly convex, 

 and the posterior angles are prolonged in broad, flat spines, as in B. 

 formosus. The pygidium is semicircular, with a moderately convex axis, 

 and a very wide and deeply concave margin, which occupies nearly the 

 whole of the side lobes and space behind the axis. 



Length of the head 17 lines ; width about 30 lines. 



Should it turn out that B. fraternus has the posterior angles of the 

 head as in this species, then the only difference would be in the pygidium. 

 They should then, perhaps, be united under one specific name ; in which 

 case I beg that B. validus be retained. 



The beds in which B. validus occurs, are about 2000 feet below those 

 holding B. fraternw. 



Locality and Formation. L, Point Rich, Newfoundland; Quebec 

 group. 



Collector. J. Richardson. 



GENUS DOLICHOMETOPUS. (Angelin.) 



The following two species are placed in Angelin's genus, Dolichometopus, 

 provisionally. But they, with several others such as Baihyurus capax 

 and B. armatus, may constitute a new genus. 



