ADDITIONAL NOTES ON THE CAMBRIAN OF CAPE BRETON. 411 
Urotheca, sp., PI. XVIII. fig. 6. 
A thin chitinous tube seemingly of this genus occurs sparingly. 
It is thickened along one side and is marked by very minute longitu- 
dinal stride. 
Parabolinella quadrata, n. sp. PI. XVIII, fig. 7. 
Middle piece of the head shield subtrapezoidal in outline. Anterior 
marginal fold narrow ; width of the front area of the cheek, one-fourth 
of the length of the glabella. Glabella quadrate in front, and as wide 
there as its length, but considerably narrower at the posterior furrow. 
Posterior and second furrow directed backward, and deeply impressed 
in the outer third, but not reaching the margin of the glabella, 
Eyelobe slightly elevated, extending opposite the two anterior furrows 
of the glabella ; ocular fillet broad and indistinct. Fixed cheek 
triangular, about as wide behind as the length of the dorsal suture 
behind the eyelobe. The posterior marginal furrow is faintly marked. 
The dorsal suture arches outward in front of the eyelobe, and behind 
it goes direct backward and outward to the posterior margin, and in 
that part is nearly half as long again as the chord of the eyelobe and 
anterior part of the suture together. 
The pleurje are long and narrow, and have a sharp, deep furrow, 
which is nearest the posterior margin ; they are sharply bent, and 
pointed at the ends. The ring is pushed up in the middle into a 
pseudo-tubercle, such as is common on the occipital ring of species of 
this genus. 
Sculpture . — A row of faintly marked tubercle-like swellings are 
found along the bottom of the anterior marginal furrow. The middle 
piece of the head-shield in all its parts appears smooth, except for a 
minute punctation. 
Size . — Middle piece of the head-shield 25 mm. long. It is 25 mm 
wide at the anterior and about 40 at the posterior end. 
This species is near Parabolinella limitis of Brtegger. It differs in 
its longer and more quadrate glabella. The fixed cheek also is longer 
and the eyelobe less prominent. Apparently also it is a larger species. 
From P. rugosa of the same author it is distinguished by its more 
quadrate glabella and by a different arrangement of the glabellar 
furrows. It resembles this species in the possession of a comparatively 
