Compared 

 with other 

 species. 



164 



on the inner surface, extends from the posterior cardinal angle, around 

 the ventral slope of the shell to the anterior marginal curve. The 

 following are measurements of some valves : 



Left valve, length 3mm. ; width 2 mm. ; depth 1 mm. 

 Right " " 3 " " 2J " " 1 " 



Carapace 



2 " 



As compared with the species of the Protolenus zone this species is a 

 little larger than B. oculata, from which it is easily distinguished by the 

 character of the surface ornamentation ; in the Etcheminian species the 

 pits are coarser and closer together, and it thus has a rougher surface 

 than the species above named. The sculpturing is more like that of 

 Isochilina ventricosa, which, however, is a much larger species. P. aurora 

 of the Protolenus zone is nearly of the same size, but it differs in the 

 strong anterior furrow, and in its finely pitted surface. 



Bradoria 

 vigilans. 



Compared. 



BRADORIA VIGILANS. PI. XIII., figs. 2 a to c. 



Bradoria vigilans, n. sp. Nat. Hist. Soc. N. B. Bull, vol. iv., p. 205, pi. 



iv.j figs. 2 a to c. 



Can. Rec. Soc. Montreal, 1902, p. 454. 



Outline of the valves ovate, somewhat pointed behind, moderately 

 arched transversely, the valves somewhat ridged lengthwise. The right 

 valve has a hinge-line about half of the length of the valve, which is 

 flattened down at the hinge forming there a lance oval area. There is a 

 prominent tubercle at the front of the hinge surrounded by a shallow 

 groove. The margin is gradually rounded from the front, and project 8 

 somewhat at the posterior end, whence the posterior cardinal curve goes 

 directly upward to the back of the hinge. 



Sculpture. The surface is marked by close set granulations, that 

 become finer toward the hinge-line and the ocular tubercle ; at the pos- 

 terior quarter of the valves the granulation graduates into a series of sub- 

 parallel anastomosing ridges. 



Size. Length 3 mm. ; width 2 mm. ; depth mm, 



Horizon and locality. Found in Assise E. 3 e. of the Upper Etche- 

 minian, Dugald brook, Escasonie, Cape Breton, N.S. 



" Distinguished from Aparchites conchijormis of the Protolenus Fauna, 

 by its smaller size and prominent tubercle ; and from A. secunda by the 

 tubercle and the coarser ornamentation," as well as by the angulated 

 projection at the end of the valve. 



