290 



AMPHION JULIUS. (N. sp.) 



Fig. 2Y9. 

 Fig. 279. Amphion Julius. The pygidium. 



Description. Pygidium rather convex, semicircular ; axis elongate- 

 conical, strongly convex, with about ten rings, the last three or four 

 obscurely denned. The side lobes have five strong ribs, each terminating 

 in a short slender spine. The grooves between the ribs are deep, and a 

 little less than the width of the ribs. The last rib on each side originates 

 at the mid-length of the axis, and lies parallel and close thereto. The 

 others become gradually more divergent to the first. The true margin of 

 the pygidium does not extend beyond the apex of the axis, but the ribs 

 project a little further, forming a fringe of ten slender, sharp spines. The 

 last three or four ribs of the axis are so obscurely separated that they 

 seem to form a single triangular segment. Length of the axis of the best 

 preserved specimen 3 lines ; width of the same at the anterior margin 

 1 lines ; length of the spines about 1 line. 



This pygidium has a greater number of rings in the axis than there is 

 in any described species of Ampliion. It is barely possible that this may 

 be a Cromus ; but it has fewer ribs in the side lobes than any species of 

 that genus figured by Barrande. 



Locality and Formation. P, Cow Head, Newfoundland ; Quebec 

 group. 



Collector. J. Richardson. 



AMPHION INSULAKIS. (N. sp.) 



Description. Pygidium strongly convex, with five pairs of ribs lying 

 close together and curved backwards, so that for the greater part they are 

 sub-parallel with the axis. The margin, being imperfect all round the 

 characters of the extremities of the ribs, cannot be made out. The axis 

 has five well defined articulations besides the terminal one, which latter is 

 triangular, and extends backwards in a long point between the last pair of 

 ribs. 



Length of the specimen 4 lines ; width at the anterior margin apparently 

 about 5 lines. 



