Obol. 



480 



St John's group^ N. B., and Eureka district, Nevada. (Pal. 

 Eureka Dist. Mon. 8, U. S. Geol. Survey.) Cambrian, O. 



Obolella transversa, Hartt. Dawson, Acad. Geol. 2d 

 ^ St Ed. 1868, p. 644. Wal- 



cott. Bulletin No. 10, U. 

 S. G. S. page 16, plate 1, 

 J fig. 5, inside Central valve, 

 enlarged eight times / 5 

 (2, cast of inside dorsal 

 valve, enlarged six times — St. John, N. Brunswick. M. C. 

 Obolus (Apollinus ?) Owen. Geol. ^Wisc, Iowa and Minn,, 



1852, pi. lA, figs. 20, 

 15, 11, (9 omitted), 

 from member h of 

 grits,- mouth of Black 

 river. Supposed Pots- 

 dam SS. — /. To this I 

 add Owen's beautiful figures of slabs of Obolus grit from the 

 same locality, to show the grouping of the little shells in the 

 rock, pi. IB, figs. 3, 14. — /. 



Obolus canadensis, Billings. (Dinoiolus canadensis^ 



Jlc. 



Geo, 



