Vol. 55.] BEDDEB EOCKS OF COUNTY WATEREOEB. 759 



border. The glabella, which is slightly raised above the general 

 surface of the head-shield and is nearly three-quarters its length, 

 is of a peculiar shape, being much expanded between the large 

 embracing eyes and contracted in front of them. In front of the 

 eyes it is broadly conical, with an obtusely-rounded anterior end 

 situated a short distance behind the marginal pitted furrow. 

 Between the eyes it is transversely oval, being twice as wide as in 

 front of them, and the width of this portion is about twice the 

 length. Its sides are closely embraced by the large semiannulareyes. 

 A straight neck-furrow parallel to the posterior margin of the neck- 

 ring marks off the glabella at its base. A pair of very short 

 oblique furrows, in some specimens bent round into a V-shape, 

 indent the surface of the posterior portion of the glabella at a 

 distance from the neck-furrow equal to about one-fifth the whole 

 length of the glabella, and separated one from the other by a space 

 equal to about one-third its basal width. There are no other dis- 

 tinct furrows on the surface of the glabella, but it is ornamented by 

 fine, closely-set, transverse undulating lines arched forward in the 

 centre and on each side. 



The neck-ring is broad, flat, and parallel-sided. -It is marked by 

 several thread-like lines, gently curved forward in the centre. 



The large semiannular eyes, embracing the hinder part of the 

 glabella, rest with their base on the neck-furrow and against the 

 neck-segment, and then curving forward extend half the length of 

 the glabella. 



The facial suture can be satisfactorily traced only in front of the 

 eyes, and from the anterior end of the glabella it is seen to strike 

 off obliquely outward so as to cut the front margin of the head- 

 shield. The distance apart of the facial sutures at their point 

 of section of the margin is about equal to the width of the broadest 

 portion of the glabella. 



The free cheeks are flat and unornamented, except for a few 

 obliquely-directed raised lines running back from the marginal 

 furrow for a short distance. 



The under-surface of the border (doublure) of the head-shield is 

 marked by a few concentric striae. There is a transverse sinuous 

 suture running from the glabella to the outer margin of the head- 

 shield, the interpretation of which is doubtful. 



Body-rings and pygidium unknown. 



Measurements. 



mm. 



Length of head-shield 14-0 



Width of the same , 30-0 



Length of glabella g-Q 



Width of the same between the eyes 14-0 



„ ,, in front of the eyes 8"0 



„ ,, along the neck-furrow 8'0 



„ ofneck-ring 2*0 



Affinities.— It is difficult to assign this peculiar form to any 

 known genus. It seems to be allied to Remojpleurides by the large 



