326 



segments; their posterior extremities touching the neck furrow, their 

 anterior a little in advance of the mid-length; neck furrow all across. 

 No glabellar furrows are visible. 



Of this species four specimens were collected, all about 2 lines in 

 length each. 



This species is most closely allied to R. Canadensis of the Chazy lime- 

 stone (ante, p. 182), but is more convex, and shows no indications of 

 glabellar furrows. 



Locality and Formation. Stanbridge, range 6, lot 20 ; Quebec group. 



Collector. -T. C. Weston. 



HARPES GRANTI. (N. sp.) 



Fig. 314. 

 Fig. 314. Harpes Granti. A perfect head, enlarged three diameters. 



Description. Head, including the border and spines, sub-elliptical;* 

 the front uniformly rounded ; the sides also uniformly convex, but more 

 broadly curved. Without the border, the head is very strongly convex, 

 its width at the neck segment one-third greater than the length ; front 

 broadly rounded, sides nearly straight, slightly converging forwards. 

 Glabella elongate conical, cylindrical, rounded in front, with two obscure 

 glabellar pits at the sides ; neck furrow all across. The eyes appear to be 

 situated opposite the anterior extremity of the glabella, but their position 

 is very obscurely indicated in the specimen. The border is gently con- 

 cave, nearly flat, its greatest width in front of the glabella, where it is 

 equal to one-third the whole length of the head from the neck, segment to 

 the front margin, a little narrower at. the sides of the head, somewhat 

 rapidly tapering from the line of the neck segment to the points of the 

 spines. The length of the spines is four-sevenths of the length of the 

 head from the neck segment to the front margin. The distance between 

 the points of the spines is a little more than half the greatest width of the 

 whole head, including the border. The neck segment, at the posterior 

 margin forms an elevated plate which follows the inner edge of the spines 

 to their points. 



