PAE EXCVe SILT 
EOsTROPHOMENA ELEGANTULA (Walcott) (p. 796). 
Ficure 6. Exterior of ventral valve, the type specimen. U.S. Nat. Mus. Cat. No. 52316a. 
6a. Partly exfoliated dorsal valve. U.S. Nat. Mus. Cat. No. 52316b. 
6b. Cast of interior of dorsal valve. All elevations and depressions are the reverse of their actual occurrence 
in the interior of the shell. U.S. Nat. Mus. Cat. No. 52316c. 
The specimens-represented are all from Locality 310j, passage beds between the Upper Cambrian and the Ordo- 
vician, Ceratopyge limestone at Borgholm, Oeland Island, Sweden. 
Eoortuis AaTAVA (Matthew)? (p. 774). 
Figures 7 and 7a. Ventral valves. Figure 7 represents the type specimen. 
7b. Dorsal valve. 
The specimens represented are all from Locality 308a, Upper Cambrian shales of Division C3a of Matthew at Navy 
Island, St. John Harbor, St. John, New Brunswick. The figures (7, 7a—b) are redrawn from the specimens illustrated 
by Matthew [1893, Pl. VII, figs. 8c, 8a, and 8b, respectively]. 
a A photograph of this plate was sent to Prof. J. C. Moberg, who reproduced it as Plate II of his paper on the Ceratopyge region [Moberg and 
Segerberg, 1906, Pl. II). 
