400 



Fig. 376. 

 Pig. 376. — Glabella and pygidium of D. magnificus. 



until it crosses a line drawn through the eye parallel •with the axis of the 

 body, and having gained a point situated outside of this line at a distance 

 from it equal to the length of the eye or thereabout, it curves inward and 

 reaches the front margin at a point somewhere near the line. It then ap- 

 pears to run round the margin. Behind the eye its course is, after a short 

 inward and backward curve, directly outwards nearly parallel with the 

 posterior furrow apparently one half the width of the cheek when it curves 

 back, and cuts the posterior margin before reaching the angle. On each 

 side of the glabella nearly opposite but a little behind the position of the 

 eye there is an obscure rounded elongated prominence. 



Judging from several detached cheeks the posterior part of the head 

 must be very wide and the angles produced into moderately long triangu- 

 lar spines. 



The pygidium is somewhat fan-shaped, the posterior margin terminating 



