308 Foint Levi Fossils, 



thirds of tlie width but dies out before reaching the sides of the 

 glabella. In front of this there are from one to three shallow 

 pits or faint depressions on each side of the median line repre- 

 senting the glabella furrows. A line drawn across the head at 

 one third the length from the posterior margin would pass 

 through the centres of the eyes nearly. The eyes are annular about 

 one sixth the whole length of the head, situated their own length 

 from the posterior margin and with their centres about the same 

 distance from the side of the glabella. The facial suture runs 

 from the inner anterior corner of the eye forwards and outwards 

 at an angle of about 45° to the longitudinal axis of the body 

 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 appears 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 elon- 

 gated prominence. 



Judging from several detached cheeks the posterior front of the 

 head must be very wide and the angles produced into moderately 

 long triangular spines. 



The pygidiura is somewhat fan shaped, the posterior margin 

 terminating in six triangular points or spines, the outer ones of 

 which are the longest and the inner ones diminishing in length so 

 as to produce a semicircular emargination for the posterior out- 

 line. The greatest width of the pygidium is at about one third 

 its total length from the front measuring to the extremity of the 

 longest spine. In front of a line drawn across at this place 

 the contour is nearly semicircular but behind the line the sides 

 are straight or only gently convex and somewhat parallel slightly 

 converging towards each other. The main body of the axis is 

 about one fourth the total length, convex conical and with four 

 shallow concave transverse grooves. Four ribs in each of the 

 side lobes besides a rudimentary ridge along the middle being a 

 continuation of the axis. The surface is marked by fine fissure- 

 like undulating lines. 



