16 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 78 



postventral outline also seems less sharply curved, but this is due to 

 imperfect preservation of the edge. The feature relied on by Mat- 

 thew is a constriction, or rather a depression, in the dorsal edge of 

 the exposed valve; but as no corresponding depression occurs on the 

 opposite valve, the peculiarity is regarded as accidental and not 

 structural. Hence mutation ligata is ranked as a synonym of B. 

 scrutator. 



The second specimen, B, though not perfect, is still good enough 

 to leave no doubt in our minds as to its identity with the types of 

 Schmidtella acuta. These are of an unquestionable species of Bra- 

 doria, but were misinterpreted by Matthew, who regarded the pos- 

 terior end as dorsal. 



Occurrence. — Lower Cambrian (Upper Etcheminian, division E3c- 

 E3/): Dugald Brook, Cape Breton, Nova Scotia. Walcott locality 



1371'. 



Plesiotype. —C&t. No. 50540, U.S.N.M. 



BRADORIA OCULATA (Matthew) 



Plate 1, Figures 13, 14 



Primitia oculata Matthew, Trans. New York Acad. Sci., vol. 14, 1895, p. 136, 



pi. 8, figs. 2a, 26. 

 Bradoria oculata Matthew, Bull. Nat. Hist. Soc. New Brunswick, No. 18, 1899, 



p. 204. 



The figures of the type and only example of this species do the 

 specimen much more than justice, it being crushed so that we hesitate 

 to decide definitely as to its afiinities. Apparently it is a close ally 

 of B. scrutator, the surface punctae being about equal in number 

 (they are smaller but thicker walled), the outline about the same, 

 and the ocular tubercles close to the anterior extremity as in that 

 species. Without better specimens, however, it would be unwise to 

 either refer B. oculata to synonymy or to recognize it as a good species. 



Occurrence. — Lower Cambrian (Hanfordian, division Cl63): Han- 

 ford Brook, St. John County, New Brunswick. 



BRADORIA VIGILANS Matthew, s. s. 



Plate 1, Figure 15 



Bradoria vigilans Matthew (part) Bull. Nat. Hist. Soc. New Brunswick, No. 18, 

 1899, p. 205, pi. 4, figs. 2a-2c; Canadian Rec. Sci., vol. 8, 1902, p. 454, pi. 2, 

 figs. 2a-2c; Geol. Surv. Canada, Rept. Cambrian Rocks Cape Breton, 1903, 

 p. 164, pi. 13, figs. 2a-2c. 



Five specimens in Matthew's collection are called types of this 

 species: A, B, C, D, and E. Of these the last is the original of Mat- 

 thew's figures; hence it is regarded as the type of the species. On 

 comparison it is found that D agrees exactly with the type E, while 

 A and B agree much better; indeed, it is believed they agree in every 



