292 



centiform, rounded on the outside, terminating posteriorly at the front edge 

 of the neck furrow and extending around one-third of the width of the 

 front of the glabella ; an obscure groove just outside of the middle of the 

 cheek, parallel with the margin in the front half, but running out to the 

 edge before reaching the posterior corner. In front of the glabella there 

 are two small projecting points. The surface is obscurely tubercular, and 

 there is a small tubercle on the middle of the neck segment. 



Length from 2 to 3 lines. 



The detached glabellse occur in considerable numbers, but I have seen 

 none of the other parts in connection with any of them. There are no 

 fragments that can be identified as belonging to this trilobite, except the 

 glabella. 



Locality and Formation. N, Table Head, and P, four miles N. E. 

 Portland Creek and Pistolet Bay, Newfoundland ; Quebec group. 



Collector. J. Richardson. 



Genus ENCRINURUS. (Emmrich.) 



The following species, of which we have only some fragments, exhibits 

 characters belonging to several genera, such as Encrinurus (Emmrich), 

 Cromus and Dindymene (Barrande). I shall place it in the first named 

 genus provisionally, for the present. 



ENCRINURUS MIRUS. (N. sp.) 



Fig. 282. 



Description. Head semi-elliptical, width apparently more than twice 

 the length. Glabella clavate, moderately convex, front margin irregularly 

 rounded with a notch in the middle, width at neck-segment half the width 

 of the front, sides straight, neck furrow extending all across, three glabellar 

 furrows on each side, extending one-third across, the anterior furrow with 

 a branch making a notch in the front lobe, the lobes gradually diminishing 

 in size backwards. Fixed cheeks broad, gently convex. Eyes distant 

 from the dorsal furrows about the width of the glabella at the second lobe, 

 and placed about opposite the last glabellar furrow ; they appear to be 

 small, and are connected with the front furrow by an ocular ridge. Mov- 

 able cheeks unknown. 



Pygidium with an elongate-conical, convex axis with from twelve to four- 

 teen distinctly defined rings or segments. Side lobes with four narrow, 

 convex ribs, the last pair commencing at about the mid-length of the axis, 

 and extending backwards parallel and close thereto, the next also nearly 

 parallel, and the anterior two pairs with the posterior half of their length 



