296 



* 

 Pygidium triangular, width twice the length, the two posterior sides 



gently convex, and the margin abruptly bent down or bevelled nearly ver- 

 tically, the upper edge of the bevel angular and with indications of a 

 slightly elevated linear rim ; axis very depressed convex or nearly flat, 

 its width at the anterior margin about one-fourth of the whole width, 

 extending the whole length or nearly so, crossed by obscure undulating 

 furrows. Side lobes gently convex. 



Length of the head without the rostrum, 5 or 6 lines ; length of the 

 pygidium about 4 lines. 



The pygidium of this species resembles, at first sight, that of A. Icevius- 

 culus. The latter, however, is proportionally wider, the posterior bevelled, 

 margin thicker, and the upper edge of the bevel rounded instead of 

 angular. 



It differs from A. nasutus (Dalman), principally in having the rostrum 

 fluted instead of round. 



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

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



Collector. J. Richardson. 



AMPYX RUTILIUS. (N. sp.) 



Description. Pygidium subtriangular, length about one-third of the 

 width, nearly vertically bevelled behind, the upper edge of the bevel with 

 an acute linear rim. Axis cylindro-conical, strongly convex, extending 

 the whole length, with about ten rounded rings. Side lobes nearly flat, 

 slightly concave near the margin, with nine ribs very distinctly defined 

 the whole width. 



Width of the specimen 4 lines ; length 1 j- lines. This pygidium resem- 

 bles that of A. Halli, (ante, p. 24), but in that species each of the ribs on 

 the side lobes has a pleural groove, whereas in this species they have no 

 such groove. 



It differs from A. semico status, in having more numerous ribs, which 

 also extend the whole width. It occurs along with it in the same beds, 

 and it may be necessary hereafter to unite the two ; but, at present, they 

 appear to me to be decidedly distinct. 



Locality and Formation. P, four miles N. E. from Portland Creek, 

 Newfoundland ; Quebec group. 



Collector. J. Richardson. 



