166 



Contributions to Palaeontology. 



CHARIOCEPHALUS WHITFIELDI ( n. s.). 

 PLATE I, FIGS. 49-53 ; AND PLATE V, FIG. 20. 



Head wide, with gently convex cheeks. 



Glabella regularly convex, the sides rising rather ab- 



t ruptly from the depression, semielliptical, rarely ap- 

 pearing a little truncate in the front, and in the cast of 

 the interior entirely smooth, or faintly marked by two 

 pairs of furrows, the posterior one of which has rarely 

 been seen to extend across the middle. Occipital fur- 

 row shallow, gently depressed : occipital ring depressed- 

 convex. Dorsal furrow rather broad and well defined, 

 continued in front of the glabella in nearly the same 

 strength as at the sides ; and just within the contour of 

 the front, it is marked by two minute rounded pits. 



The facial suture cuts the contour of the head at or near 

 the middle of the front, and, making a gentle convex 

 curve, it approaches the glabella just anterior to the 

 eye-lobe, and following the curve of the latter to its 

 posterior limit, continues in a gently diverging line to 

 the base of the cheek halfway between the dorsal fur- 

 row and the outer margin. 



Fixed cheeks narrow, suddenly contracted in front of the 

 eye, and gently expanded towards the palpebral lobe, 

 and extended in a comparatively short posterior limb. 

 The frontal limb is narrow, convex, sublunate or some- 

 times sublinear and straight. 



Movable cheeks with a regular circular curve from the 

 front 'to the beginning of the spine at the posterior 

 angle : the lower part of the cheek is wide, gradually 

 narrowing anteriorly, with the border reaching to the 

 centre of the front of the head. The inner angle shows 

 a large ocular sinus. The posterior limb is extended 

 into a straight diverging spine. The surface is gently 

 convex towards the eye, gradually depressed to a broad 



