411 



Bathyurus akmatus. (N. sp.) 



Fig. 392. 



Description. — Head very convex, with a strong broad-based spine pro- 

 jecting backwards from the neck segment. The contour of the glabella 

 is obscurely indicated by tvfo faint grooves which appear to die out before 

 reaching the front margin. It appears to be regularly conical, but scarcely 

 at all elevated above the general convex surface of the head. Length of 

 head in the specimen figured — excluding the marginal rim, which is 

 unknown, — nine lines. Width of glabella at base, six hnes ; at about the 

 middle of the head, five lines ; the length of the spine is unknown. Surface 

 smooth. 



Limestone, No. 1. 



Fig. 392. 



Fig. 393. 



Fig. 394. 



Fig. 395. 



Fig. 392. — Bathyurus armatus. 

 Fig. 393. — Bathyurus Saffordi. 

 Fig. 394. — Baihyurus oblongus. 

 Fig. 395. — Bathyurus Cordai. 

 Fig. 396. — Bathyurus quadratus. 



Fig. 398. 



Bathyurus Saffordi. (N. sp.) 



Fig. 393. 



Description. — Glabella conical convex, much elevated above the general 

 surface of the head, front angles rounded, sides somewhat straight in the 

 anterior half, below which they curve a little outwards, and become parallel 

 for a short distance next the posterior margin. The neck furrow in the 

 cast of the interior is well defined all across, but when the crust is preserved 

 it dies out on approaching the sides. The rim which forms the front 

 margin has a flat slope inwards to the anterior edge of the glabella. 



