196 



depressed convex, with a minute tubercle in the middle. The margin of 

 the head appears to b^ wide and somewhat concave. At each of the 

 anterior angles of the glabella there is a shallow depression. The dorsal 

 furrows are narrow and obscurely impressed. Pygidium strongly convex 

 in the central region, the marginal third becoming gradually flattened ; 

 margin not preserved ; axis narrow, conical, strongly convex, five strong 

 rounded rings, besides the terminal one, which is about one-third the 

 length of the whole axis and gradually declines backwards ; side lobes, 

 with the four anterior ribs well defined, and each divided into two by a 

 deep groove, which commences close to the axis ; at their outer extremi- 

 ties the ribs gradually die out ; there are indications of a fifth and ter- 

 minal pair of ribs. It is probable that the pygidium is bordered by a flat 

 smooth margin. 



Surface of the head and pygidium smooth. 



Length of the largest glabella seen 14 lines ; width at the neck 

 segment 11 lines ; width at the anterior margin 8 lines. 



This trilobite probably attains a length of 4 or 5 inches. 



The pygidium and head have not been seen in connection, but several 

 of each were found in the same piece of stone, and so associated, that I 

 have no doubt of their being rightly referred. 



This species is closely allied to D. magnificus. It is dedicated to 

 T. Devine, Esq., of the Crown Land Department. 



Locality and Formation. — Point L^vis, in hmestone No. 2 ; Quebec 

 group. 



Collectors. — Sir W. E. Logan, T. Devine, and T. C. Weston. 



DiKELOCEPHALUS HiSINGEM. (N. Sp.) 



a 



Fig, 182. 



Fig. 183. 



Fig. 184. 



Fig. 182. — Dikelocephaluf Hisingcrl. 



183. — D. affinis, variety of D. Oweni. — a, glabella; 6, supposed pygidium. 

 184. — D. Sesostrii. 



Description. — Glabella oblong, truncato-conical, narrowed towards the 

 front, convex ; the outline on a side view rather abruptly elevated in front, 

 then gently arched to the neck furrow ; sides straight ; anterior angles 



