ETCHEMINIAN FAUNA OF CAPE BRETON. 205 



Sculpture. — The whole surface is covered with closely set con- 

 spicuous pits that are finer toward the hinge-line, where they have a 

 linear arrangement. 



Size. — Length 3 mm., width 2 mm. 



This species is a little larger than B. oculata of the Protolenus 

 Zone, from which it is easily distinguished by the surface ornament- 

 ation ; the sculpturing is more like that of Isochilina ventricosa of the 

 same zone, but that species is much larger. 



Bradoria vigilans, n. sp. PI. IV., figs. 2a to c. 



Outline of the valves ovate with a straightened hinge line, which 

 is about half of the length of the valve. Ocular tubercle at the front 

 of the hinge line, and surrounded by a shallow groove. The margin 

 is gradually rounded at the front, and below, and project somewhat 

 behind, hence it is nearly straight to the hinge. 



Sculpture. — Surface marked by closely set granulations, that be- 

 come finer toward the hinge line and ocular tubercle, and graduate 

 into a series of sub-parallel anastomosing ridges at the posterior 

 quarter of the valve. 



Size. — Length 3| mm., width 2| mm. 



Distinguished from Aparchites conchiformis of the Protolenus Zone 

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

 the tubercle and the coarser ornamentation, etc. 



Bradoria rugulosa, n. sp. PL III., figs. 3a to d. 



A sub-orbicular species, with outline straightened along the hinge 

 line. Ocular tubercle somewhat prominent and situated a little below 

 the anterior end of the cardinal line, which is about half of the length 

 of the shell. There is a faint furrow behind the tubercle nearly 

 parallel to the hinge line, and a shallow pit just in front of the 

 tubercle. A narrow, obscure marginal rim appears at the posterior 

 margin of the valve. 



Sculpture. — The lower slopes and posterior half of the valve are 

 covered with fine anastomosing ridges, concentric to the upper side of 

 the valve ; toward the top and front of the valve these ridges become 

 obscure and the surface of the valve is granulated. 



Size.— Length 24 mm., width nearly as great. 



This little species is easily distinguished from the others by its 

 circular outline and rugulose surface, which simulates that of certain 

 trilobites. 



