Hyol. 



294 



times; fig. 6 5, o, cross sections; 6(^, lid (operculum) enlarged 

 twice ; 6 e, lid enlarged Ave times ; fig. 6 f. small broad speci- 

 men, enlarged-five times.- Lower Cambrian ( Conglomerate lime- 

 stone) formation at Troy, N. Y., and at Bic and St. Simon, 

 Canada. L. (7.— See foot-note to page 1S4, 

 Hyolithes billingsi. (Salterella ohtusa Billings, Geol. 



Vt. Pal. Foss. Syoli- 

 j ^^P(» 15 thes primordialis ? 

 White, 100th, Mer. 

 Inv. Foss. lY, 1, figs. 

 5 a — e ; but not Theca 

 oUusa Salter, Mem. 

 G. S. G.B.IILp.352) 

 Walcott, Bulletin U. 

 S. G. S. No. 30, page 

 134, plate 13, fig. 1, 

 side view; 1 a front 

 view ; 1 &, back view ; 

 1g, section ; all of specimen from Nevada ; fig. 1 d, lid found 

 in same bit of rock with fig. 1; fig. 1 e, specimen from L'Anse 

 au Loup, Labrador. (None have yet been found in Vermont 

 or New York; but the great range makes it probable that they 

 ^l\\ he.)— Lower Cambrian. L. C.—See foot-note to page 1S4. 

 Hyolithes carbonaria. Walcott. [X, XL] 

 Hyolithes centennialis. Barrett, Annals of Lyceum 

 Nat. Hist. N. Y. 1877. Lower LLelderUrg, on the Delaware 

 river, near Port Jervis. VL. See Appendix. 



Hyolithes communis. (Billings, Can. Nat. 1872, VI, 214, 

 Mr ^ 34 3, PI 14 figs. I a, 1 h.) Walcott 



^ ^ ^ Bulletin U. S. G. S. No. 30, 



page 137, plate 14, figs. 3, 

 back view, natural size ; 

 3 h, another specimen ; 3 c, 

 lid (operculum;) all from 

 Bic harbor, below Quebec, 

 Canada. Fig. Zd^ 3 e speci- 

 mens from near Troy, N. 

 Y., 3 /*, 3 ^, cross sections 

 J to show irregularities of 

 thickness of shell ; magni- 



