282 



observed. Ihe glabella is conical, and apparently with a single lobe on 

 each side next the neck-furrow. The margin is gently concave, its width 

 equal to one and a-half the length of the glabella, with coarse, rounded, 

 radiating strise, or small ribs. It must be very closely allied to ff. rugosus 

 (Angelin), a species which occurs in Norway and Sweden, in Angelin's 

 Regie, B C, at the base of the second fauna. 



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

 Newfoundland ; Quebec group. 



Collector. — J. Richardson. 



Hakpides concentricus. (N. sp.) 



Fig. 268. 



EemarJcs. — This name is proposed for a species, of which a fragment of 

 ired. It occurs with S. At 



LiCHAS JUKESII. (N. sp.) 



the margin is above figured. It occurs with H. Atlanticus. 



Fig. 269. Fig. 270. 



Fig. 269. — Lichas Jukesii. a, front view of the head ; b, upper side. 

 Fig. 270. — Shumardia glacialis. A nearly perfect head. 



Description. — Head semi-elliptical or subtriangular, convex, flattened 

 on the top, abruptly elevated in front ; posterior angles with short spines 

 directed obliquely outwards and backwards at an angle of about 45*^, with 

 the median line of the body. That part of the head which is situated 

 between the eyes is longitudinally divided into three lobes. The width of 

 the middle lobe at the neck furrow is about equal to half the length of 

 the head, but it becomes nearly one-third narrower just in advance of a 

 line drawn across the eyes. It then rapidly expands until at the front 

 margin, its width is equal to the length of the head. The other two lobes 

 are each, at the neck furrow, about half the width of the middle lobe ; 

 they become a little wider and more tumid just in front of the eye, and 

 then contracting, end in an obtuse point before reaching the margin. The 

 middle lobe is abruptly elevated in front, somewhat tumid and projecting 

 a little over the margin. The width of the neck segment appears to be 

 nearly equal to the length of the head. Neck furrow well defined. The 

 cheeks are subtriangular, convex, and terminated at the outer angles by 



