266 



portage road, at falls, two good specimens (figs. 2 & 3) and one fragment ; 

 and upper rapid, a large but imperfect cast of the body chamber and of 

 nine or ten of the chambers between the septa. 



" The type of P. Nestor is a mere cast of the interior of the shell, with 

 no indications of the surface markings of the t6st, and in P. Nestor, var. 

 Canadense, there are remains of rather coarse longitudinal ribs." 



CRUSTACEA. 



OSTRACODA. 



IsocHiLiNA or Lbperditia, sp. indet. 



TJpper rapid : a rather large right valve about twelve millimetres long, 

 but with only its interior exposed. 



Trilobita. 



Ill^nds, sp. indet. 



Middle rapid, one pygidium ; foot of portage road, three glabellsB and 

 four pygidia ; and portage road at falls ; one pygidium. The dorsal furrows 

 of these three glabellse are well defined, but the shape and position of the 

 eyes, or ocular lobes, are not well shewn in either. 



Beonteus Ekwanbnsis, Whiteaves. 



Plate 42, fig. 1. 



Bronteus Ekwanensis, Whiteaves 1904. Geol. Surv. Canada, Ann. Rep., vol. 



XIV, pt. F, p. 58. 



" Pygidium very large, attaining to a length of a little more than four 

 inches and a little longer than wide, longitudinally and broadly subel- 

 liptical but truncated anteriorly, its posterior end being rather narrowly 

 rounded and its lateral margin nearly straight on each side anterior to 

 the midlength. Axis moderately convex, inversely subtriangular, longer 

 than wide, with an obtuse apex, occupying more than one-third but less 

 than one-fourth of the entire length of the pygidium and marked with a 

 transverse groove near its anterior margin. Pleural region most pro- 

 minent at and near the midlength of each of the pleural ribs, decreasing 

 abruptly in convexity outward to the lateral margins of the pygidium, 

 but much more gradually so to its posterior margin ; marked by fifteen 

 large flattened convex radiating ribs, with narrow grooves between them ; 

 each rib being narrow at and near the axis and wider at some distance from 

 it, though all the ribs fade out at a short distance from the margin and 

 before reaching it. The median rib is shallowly bifurcate posteriorly. 



