477 



Obol. 



Oholella cingulata^ Billings. Now Kutorgina cingulata, 



a.c. 



G(^Q 



Walcott. Fal. Foss. 



Vol. 1,1861. Geol. 

 j^m Can. 1863, p. 284, 

 ^ fig. 287, a^ ventral 

 valve ; 5, dorsal 

 valve; c, interior 

 of dorsal valve. Quebec group. {Wdlcoit) Lower Cambrian. L. C 



mf 



Obolella circe. Walcott. Bull. No. 30, TJ. S. G. S. page 



h1 10 11^5 plate 10, fig. 3, inside 

 ' of dorsal, and fig. 3 a^ in- 



side of ventral (?) valves. 

 — See Billings, Can. Nat 

 1872, Vol. 6,' p. 219.— 

 Georgian limesione, be- 

 low Quebec. Z. C. 



Obolella crassa. Ford. ( Orbicula orassa.^ Hall, Pal. N. Y. 



Vol. 1, pi. 79, fig. 8^.— 

 pl*IO Avicula desquamata^ 

 Hall, Pal. N. Y. Vol. 

 1, pi. 80, fig. 3 a, b — 

 Dieolomus crassa^ 

 Hall, 23d An. Kt. N. 

 Y. p. 246, pi. 13, figs. 6 

 to 9, — Obolella crassa^ 

 Ford, Am. Jour. Sci. 

 Vol. 2, p. 33, and Vol. 

 21, p. 131, figs. 1, 2.) 

 Walcott, Bull. No. 30, 

 U. S. G. S. page 114, 

 plate 10, fig. 1, ventral 

 valve, well-preserved 

 inside surface, enlarged 

 three times ; 1 a^ dorsal 

 valve, outer surface ex- 

 foliated, enlarged ; 1 

 5, dorsal valve with 

 outer surface pre- 

 served, enlarged twice ; 



