Tkiloi!! 1 Ks OK THi: CHAZ^■ LiMEsroNK. 3;>7 



extends to the posterior margin of the pygidium, tapering to a point 

 there. The pleura bear four pairs of distinct furrows, and four pairs of 

 pits on the border. 



Locality, (irenville and Fitzroy Harbor, Canada. Types in the 

 museum of the Canadian (Geological Survey, Ottawa, Canada. 



Cenus BATHYURELLUS Billings. 



BathytireHus Billings, 1865, Paleo/.oic Fossils of Canada, \'oliimc I, page 262. 



The following is Billings' original description of this genus : 



" Generic Characters. — Trilobites of medium size, oblong, ovate ; 

 head, thorax, and pygidium sub-equal ; head convex, with the pos- 

 terior angles sometimes produced backward into spines ; glabella 

 conical, usually con\ex, and without glabellar furrows ; eyes lunate ; 

 facial suture in front of the eye curving outward, then either straight 

 forwards or curving inwards on approaching the margin, behind the 

 eye running outwards sub-parallel to the neck furrow, and cutting the 

 margin before reaching the outer angle. 'Hiorax distinctly trilobed, 

 about nine segments ; pygidium with the axis usually short and not 

 strongly grooved ; side lobes with short ribs sometimes indistinctly 

 developed ; or broad smooth border all around, which is sometimes 

 concave. 



"In Newfoundland we first find this genus in Division F, in rocks 

 which appear to be of the age of the lower part of the Calciferous forma- 

 tion, and it ranges upward to Division P, through a thickness of more 

 than 3000 feet." 



The first species described under this generic diagnosis is Batliytircllns 

 abniptus, which may be taken as the type. Although the eyes are 

 situated far back and close to the glabella, it shows its primitive posi- 

 tion in the Asajjhidse by the possession of nine segments in the 

 thorax instead of eight. 



Bathyurellus brevispinus sp. nov. (Plate lo, figures 13-15.) 



Cf. Batliyiirellus formostis Hillings, 1865, Paleozoic Fossils Canada, \olunie i, 

 page 265, figure 250. 



The material on which this species is founded consists of one ceph- 

 alon, from which the eyes have been broken, and a single nearly 

 complete cranidium. 



