Orthis. 



540 



10, fig. ll,Pots dam.— Geoh Vermont, Vol. 2, p. 949, f. 350, 351, 

 352.— Geol. of Canada, 1863, page 284, figs. 289a, side view; J, 

 ventral value ; ^, enlarged area of the same valve of. a speci- 

 men from the " Pots dam sandstone " of the Quebec groiip 

 (Logan.)— Walcott, Bull. No. 30, U. S. G. S. page 120, plate 7, 

 fig. 7, Ventral ('0 valve and section, naU size ; 7 a, dorsal (?) 

 valve, enlarged; 7 5, view of its area. — Lower Cambrian ( Geor- 

 gian) formation; three localities in Vermont. — Z. 67. 



Orthisina grandseva, Billings. Can. Nat. & Geol. Vol. 4, 



21 1859. Geology of Canada, 1863, page 

 113, figs. 21 a, ventral valve; 5, another 

 ventral valve showing the area and fora- 

 'Q^^m^ .CcL^SS^ men, Calciferous sandstone, II a, 



Orthisina orientalis. Whitfield, 1884, Bull. A. M. N. H. 



.C. 6 plj' I- P- 144, pi. 14, f. 6. Walcott, Bull. 30, U. S. G. 



- ^ S. page 120, plate 7, fig. 6, ventral valve, natural 



size, (Whitfield.) — Lower Cambrian formation, 



two localities, Vermont. Z. (7. 



Orthisina (?) transversa. Walcott, Bull. U. S. G. S. No. 



T ^' ventral valve, enlarged twice; 

 5 a^ another showing area. 

 — Lower Cambrian formation, 

 Georgia, Vt. Z. C 



Orthoceras aciculum, Hall. Geol. 4th District of New 



York, 1843, p. 243, fig. 106, 4. Portage, 



^ ^^L?Mt5 



MlW 4 H 10 b A {See figures under Go\eo\\is ^ciQvlvi^,) 



Spec. 202-4, Mapleton, Huntingdon Co., 

 Pa. T3, 108. Upper Genesee. VIII d. 



Orthoceras aciculoides. Clarke, Bull. 16, U. S. G. S. 



1885, p. 51, pi. 2, fig. 11, twice the 

 ' vni e' ' natural size ; six septa unusually far 



^ apart; species quite distinct from 



any other Devonian Orthoceras, See 

 Coleolus aciculus. Naples shales. — VIII e. 



Clk. B.J6. 



aiPHi^ 



