403 



DiKELOCEPHALUS BeLLI. (N. Sp.) 



Fig. 378. 



Description. — Head semicircular, the width apparently twice the length 

 or a little more. Front margin surrounded by a narrow convex rim, dis- 

 tant about its own width from the front of the glabella. The latter is 

 obtusely oblong, conical, rather convex, well defined all round by the nar- 

 row groove of the dorsal furrows, the sides nearly parallel, straight or 

 nearly so, the front rounded. The neck furrow extends entirely across, 

 nearly straight in the middle third and directed obliquely forward at an 

 angle of about 45° at the outer third on each side. In front of this, two 

 oblique glabellar furrows on each side, their inner extremities separated 

 by about one-third the width of the glabella, forming three lobes of nearly 

 equal size. The eyes appear to be situated opposite the second pair of 

 furrows from the front, and to be distant from the glabella about one third 

 the width of the neck segment. 



Length of head of medium size, six lines and a half ; length of glabella 

 five lines and a half ; width of the same at base four lines ; a little nar- 

 rower towards the front ; width of marginal rim half a line ; width of space 

 between the marginal rim and the front of the glabella, half a line. Sur- 

 face smooth. 



Cheeks, eyes, thorax and pygidium unknown. Dedicated to Mr. Robert 

 Bell, the discoverer of the genus in the Canadian rocks. 



Limestone, No. 1. 



DiKELOCEPHALUS MEGALOPS. (N. Sp.) 



Fiff. 380. 



Fig. 382. 



■^^ 



Fig. 381. 



Fig. 383. 



Fig. 380. — D. megalops. 

 Fig. 381. — D. cristattis. 

 Fig. 382, 383. — Pygidia common in Limestone No. 1. 



