76 



but a little narrower than the truncated pygidium ; length two 

 inches and a tenth, width an inch and three-tenths. Glabella large 

 and baloon-like in shape ; the eyes appear to occupy the greater 

 part of the cheeks, which are not more than one-eighth the size of 

 the glabella. The front portion of the axis is about three times 

 the width of the first segments of the pleura, it then tapers with a 

 rapid curve nearly to the posterior margin of the caudal shield, 

 where it is considerably less than half the width of the opposite 

 end. There are six thoracic segments, the first two are straight, 

 but the remaining four are slightly arched. The posterior segments 

 of the pleurae are almost double the length of the front segments ; 

 all of them curve gently backwards. The caudal shield is an 

 elongated oval, along the posterior margin of which there is a 

 raised rounded band. 



Locality — Outerside. From Mr. Harrison's cabinet. 



The matrix in which it is imbedded is the light grey indurated 

 Skiddaw Slate which occurs at that place. If the slate had been 

 of the ordinary type the fossil would have disappeared long ago, as 

 the rock to which it was attached projected about eighteen inches 

 from the ground, and the fossil being on the upper surface, must 

 have been subjected to the abrading action of the weather for a 

 great length of time. I was in company with Mr. Harrison when 

 he found it, and had the pleasure of chiselling it from the rock. 



Group B. No. 6. 



General form oblong, tapering slightly towards the head ; length 

 fourteen-twentieths, and width eleven-twentieths, ot an inch. The 

 axis is well-rounded, and is about one-third wider than the pleurse; 

 it maintains its width from the posterior margin of the cephalic 

 shield to the fourth segment, and then tapers rapidly to the 

 extremity, which is about one-twentieth of an inch from the margin 

 of the caudal shield : at that point its width is one-tenth of an 

 inch. The axal furrows terminate at the base of the cephahc 

 shield ; there are five thoracic segments, and five on the pygidium. 

 The head is imperfect, and the portion remaining is indistinct, but 

 it appears to have been very small ; the glabella is baloon-like in 



