297 

 Ampyx semicostatus. (N. sp.) 



Fig. 28T, 



Description. — Pygidium sub-triangular, posterior margin broadly 

 rounded, obtusely angular at the apex ; length two-fifths of the width ; 

 axis cylindro-conical, strongly convex, extending the whole length, with 

 five or six distinctly defined rounded annulations ; dorsal furrows on each 

 side of the axis, deep and well defined. The side lobes are rather tumid 

 in the middle, but concave towards the margin, the latter with a distinctly 

 elevated angular rim and nearly vertically bevelled ; there are five or six 

 ribs extending about half-way from the margin to the axis. In very small 

 specimens only two or three are visible. 



Locality/ and Formation. — N, Table Head and Pistolet Bay ; P, four 

 miles N. E. from Portland Creek, Newfoundland ; Quebec group. 



Collector. — J. Richardson. 



Agnostus Galea. (N. sp.) 



Fig. 288. Fig. 289. 



Fig. 288. — Agnostus Galba. Enlarged about two diameters. 

 289. — A. Fabius. Enlarged two diameters. 



Description. — Head strongly convex, "with a narrow rim ; front margin 

 rounded ; glabella convex, well defined all round, strongly elevated above 

 the general surface, smooth, no tubercle nor furrows ; in some specimens 

 a slight indentation on each side at about the mid-length ; a small trian- 

 gular lobe on each side at the posterior margin. The proportional length 

 of the glabella varies sUghtly, but it is, in general, about two-thirds of the 

 whole length of the head. 



Pygidium, in contour and convexity, like the head. Axis strongly 

 convex, well defined all round by the dorsal furrows ; a furrow runs all 

 across at one-third the length from the apex ; a short one on each side at 

 two-thirds the length from the apex. The tubercle forms a longitudinal 

 medium lobe in the anterior two-thirds of the axis. It (the tubercle) is, 

 at the anterior margin, slightly elevated above the general convexity of 

 the axis ; it is less elevated just over the anterior of pair furrows ; but, 

 behind this point, it rises to twice the height, and terminates abruptly at 



u 



