295 

 AMPYX L^EVIUSCULUS. (N. sp.) 



Fig. 285. 



Description. Pygidium triangular, nearly smooth ; axis rather strongly 

 convex, well defined and prominent to the apex, crossed by some obscure 

 grooves, which, however, are so indistinct that to a superficial view the 

 surface seems to be quite smooth. The posterior margin is broadly 

 bevelled, sloping at an angle of 45, the upper angle of the bevel rounded. 

 Side lobes gently convex, smooth, with the exception of a single linear 

 groove close to the anterior margin. 



Width of the largest pygidium collected 5J- lines ; length 2i lines ; 

 width of the axis at the front margin 1 J lines ; thickness of the posterior 

 margin or width of the sloping plane of the bevelled edge of a line. 



This species differs from A. normalis, in having the pygidium propor- 

 tionally wider, a more prominent axis and a thicker posterior margin. 



Locality and Formation. N, Table Head, Newfoundland; Quebec 

 group. 



Collector. J. Richardson. 



AMPYX NORMALIS. (N. sp.) 



Fig. 285. Fig. 286. Fig. 287. 



Fig. 285. Ampyx laviusculus. A pygidium enlarged one-fourth. 



286. A. normalis. The head (without the movable cheeks), and the 



pygidium. 

 287. -Jl. semicostatus. A pygidium enlarged two diameters. 



Description. Head, without the movable cheek, triangular, the width 

 about one-third greater than the length ; fixed cheeks, gently convex, 

 smooth ; neck segment consisting of a flat plate, inclining backwards. 

 The glabella elongate-ovate, greatest width about the mid-length, one 

 fourth narrower at the neck segment, the apex extending a little over the 

 front margin of the head ; the rostrum, apparently, when perfect, equal to 

 the whole length of the head, not round but fluted ; two or three ovate or 

 nearly circular scars, one each side of the glabella in the posterior half. 



