269 



DOLICHOMETOPUS ? CONVEXUS. (N. Sp.) 



Fig. 253. 

 Fig. 253. Dolichometopus ? convexus. (N. sp.) 



Description. Pygidium rather strongly and uniformly convex, nearly 

 semicircular, the length a little more than half the width, the anterior 

 angles obliquely truncated for about one-fifth the whole width, sides and 

 posterior margin uniformly rounded ; axis a little less than one-third the 

 whole width, nearly two-thirds the whole length, moderately convex in 

 front and scarcely elevated above the general surface at the apex. The 

 specimen is somewhat worn, but still it exhibits traces of two or three ribs 

 in the anterior part. There is no concave border. 



Length 9 lines ; width 12 lines. 



Locality and Formation. G, Port aux Choix, Newfoundland ; Quebec 

 group. 



Collector.-*- J. Richardson. 



DOLICHOMETOPUS ? GIBBERULUS. (N. sp.) 



Fig. 254. 

 Fig. 254. Dolichometopus? gibberulus, enlarged two diameters. 



Description. The specimen, on which this species is founded, is a 

 small pygidium, very like that of B. convexus, but with the axis shorter 

 and more prominent. The form is nearly semicircular, strongly convex ; 

 sides and posterior margin uniformly rounded ; anterior angles obliquely 

 truncated for about one-fourth the whole width ; axis conical, strongly 

 convex, distinctly defined at the apex, about half the whole length, with a 

 single linear groove near the anterior margin ; side lobes smooth, with the 

 exception of two incomplete grooves just behind the anterior margin. 



Length 2 lines ; width 3 lines. 



Locality and Formation. G, Port aux Choix, Newfoundland ; Quebec 

 group. 



Collector. J. Richardson. 



