64 



surface of all is covered with small closely crowded tubercles just visible to 

 the naked eye. 



Junction Cliff; Div. 1, A. G. J. Richardson, T. C. Weston. 



Genus Harpes, Goldfuss. 



H. CONSUETUS, n. sp. — This species is of the ordinary form of the genus. 

 Contour of the head including the border and spine ovate, broadly and 

 uniformly rounded in front, gently convex along the sides, and narrowing 

 sRo-htly backwards from a line downwards at the neck furrows to the 

 extremities of the spines. The border is gently concave, with an abruptly 

 elevated wire-hke marginal rim all round. All that part which lies in 

 front of the neck segment is not quite a perfect semicircle. The body of 

 the head is moderately convex; glabella rather small, regularly conical; 

 dorsal furrows deep along the sides, rather shallow round the front ; neck 

 furrow all across ; an obscurely developed pair of lobes at the neck furrow ; 

 the depression on each side in front of the neck furrow small. The eyes 

 are small and situated on a line drawn across the glabella at a little less 

 than one-third its length from the apex, and at about one-third the width 

 of the glabella from the dorsal furrow. Surface unknown. 



Length from the front margin to a hne drawn across the tips of the 

 spine, twelve lines ; length of the head six lines ; Avidth at the neck 

 segment, ten lines ; length of the glabella, three lines ; width of the same 

 at the base, two lines ; Avidth of the border of the head, two lines. 



The specimen consists of a mould of the head from which good gutta 

 percha casts have been obtained, giving the whole form very nearly. 

 This species is closely allied to H. Ottawaensis, but is narrower, the head 

 not so convex, and the depressed space on each side of the base of the 

 glabella smaller. South-west point ; Div. 4, A. G. J. Richardson. 



Genus Sph^rexochus, Beyrich. 



Fig. 21. 



Fig. 21. — Spkcerexochus Canadensis. 



S. Canadensis, n. sp— Glabella convex, abruptly elevated in front,de- 

 pressed convex in the central region. In a view looking down vertically 

 on the upper side the contour is broad ovate, the anterior half uniformly 

 rounded, the posterior margin somewhat straight in the middle, the poste- 

 rior corners rounded ; greatest width at the posterior third ; length a little 



