S20 



Poi?U Levi Fossih, 



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 spe- 

 cimen figured excluding the marginal rim, which is unknown, 

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

 middle of the head, five lines ; the length of the spine is un- 

 known. Surface smooth. 

 Limestone, No. 1^ 



Fig. 23. 



Fig. 24. 



Fig. 25. 



Fig. 26. 



Fig. 27. 



Fig. 23. — Bathyurus armatus. 

 Fig. 24. — Bathyurus Saffordu 

 Fig. 25. — Bathyurus ohlongus. 

 Fig. 26. — Bathyurus Cordai. 

 Fig. 21 ."^Bathyufus quadratus, 



Bathyurus Saffordi. N. s. 



Fig. 24. 



Description. — Glabella conical convex, much elevated above 

 the general surface of the head, front angles rounded, sides some- 

 what straight in the anterior half, below which they curve a 

 little outwards, and become paralled 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. 



