20 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 78. 



Occurrence. — Lower Cambrian (Etcheminian, El6-Elc^, E26, E2c, 

 E3a, E3c-Ec/): Dugald Brook, Cape Breton. Walcott localities 10^?, 

 13/, 13m", 13n'. 



Plesiotypes.—C&t. No. 50537, U.S.N.M. 



BRADORIA SUBQUADRATA, new name 



Plate 3, Figure 3 



Bradorona spectator var. acuta Matthew (part), Canadian Record Sci., vol. 8, 

 1902, p. 447; Geol. Surv. Canada, Rept. Cambrian Rocks Cape Breton, 1903, 

 p. 159. 

 Not Schmidtella? acuta Matthew i=Bradoria acuta) . 



Of the three specimens labeled types of Bradorona spectator var. 

 acuta, one (specimen C) is a poor mold of the exterior of some unde- 

 terminable yet undoubtedly distinct species of Bradoria from that 

 represented by the other two specimens. The latter, marked "A" 

 and "B", seem to be opposite valves of one species, A, however^ 

 being of an individual nearly tmce the size of B. The "variety," 

 as represented by these two specimens, is certainl}' not the same 

 species as B. spectator, the outHne of the valves being very different 

 in the two forms. In B. spectator the ventral border is neatly rounded 

 and its most prominent point but httle behind the center of the valves. 

 The posterior and anterior borders also are distinctly rounded. The 

 outHne of the types of the "variety," on the contrary, are so decidedly 

 quadrangular that curvature is scarcely suggested. Indeed, the 

 so-called variety is much more closely allied in general aspect and 

 structure to Bradoria acuta {Schmidtella? acuta), differing only in the 

 broader truncation of the anterior end in the somewhat sharper 

 angulation of the postventral extremity, and in the very shghtly 

 coarser pattern of its surface punctation. Judging from specimen 

 A the carapace grew to larger size than has been observed in B. acuta 

 (1899). The ocular tubercle is not well preserved, but doubtless 

 was smaller and rather inconspicuous. 



As the name acuta is preoccupied in the genus Bradoria the new 

 name, Bradoria subquadrata, is suggested for this species. 



Occurrence. — Low^er Cambrian (Lower Etcheminian, FAd): Dugald 

 Brook and Boundary Brook, Escasonie, Cape Breton. 



BRADORIA ELONGATA, new species 



Plate 3, Figure 8 



This new species is related to Bradoria acuta and B. benepuncta but 

 is readily distinguished by its greater length, for which reason the 

 name B. elongata is suggested. In this respect this new^ species 

 differs from all other species of the genus now know^n. 



