77 



form, and there is a crescent-shaped furrow at the base ; the cheeks 



do not appear to extend outwards so far as the first pair of 



segments ; eyes indistinct. The thoracic segments of the pleurae 



are very-clearly defined, they spread outwards horizontally from the 



deep axal furrow, but curve backwards at the outer extemity. The 



I caudal shield is large and semi-circular, indeed it appears to be 



' nearly double the size of the cephalic shield ; the pleural segments 



of the pygidium, as well as those on the caudal portion of the axis, 



are fainter than the thoracic segments : the first three of the former 



extend to the margin of the pygidium, but the remainder of the 



•caudal shield terminates posteriorly in a broad fascia of equal 



width all round. 



Locality— This specimen was found, I believe, by Mr. Ward, 

 placed on a large stone at the roadside, beneath White Pike. It 

 is imbedded in a fragment of the hard Skiddaw Slate grit which 

 occurs near that place. It now belongs to the Keswick Museum, 



Group C. No. I. 



General form oblong, tapering a little towards the tail ; a small 

 portion of the front margin of the cephalic shield is wanting. 

 When complete, the length would be about three inches and 

 eight-tenths, and the width two inches and three-tenths. The 

 glabella is shghtly convex and very large, occupying about three- 

 fourths of the cephalic shield; axal furrows curve outwards in 

 front of the cheeks, which are small and almost triangular in shape. 

 The eyes are indistinct, but appear to be placed near the glabella, 

 about one-third of the distance from the posterior margin of the 

 cheeks. The axis is large, and tapers rapidly towards the caudal 

 extremity, the front portion being nearly double the width of the 

 pleuriB. There are eight thoracic segments on the axis, they are 

 well-rounded and quite straight near the head, but faintly arched 

 near the pygidium ; on the pleura they droop backwards, and the 

 evenly-rounded surface gives place to a deep furrow. The 

 pygidium consists of a large oval shield, along the posterior 

 margin of which there is a broad depressed band ; the remainder 



