MURC. 



426 



Murchisonia arachne, Billings. Geology of Canada, 

 llr. ^^m^^. 94 1863, page 145, figure 94. Trenton group^ 



Cdn /863 



Murchisonia arenaria, Billings, Canadian Naturalist, and 



lid .^'^^^^m^^^l^^^^^''^^ arenaria (Billings) Geologist, Vol. 4, 1859. 



Geology of Canada, 

 1863, page 120, fig. 33. 

 Calciferous sandstone^ 

 —lla. 



Geo/ Can 



Murchisonia attenuata (Hall, Trans. Alb. Inst. Vol. 4, 

 )(1. ,3. page 27, 1856 ;— Whitfield, Bull. 3, Am. 



,,, Mus. Nat. Hist. N. Y. p. 88, plate 9, fig. 13, 

 i^ 1882). Collett's Indiana Report, 1883, page 

 }nci,l3V^ 31, %m, plate 32, fig. IZ, enlarged six times, 

 type specimen imperfect, from the Subcarboniferous of Sper- 

 genHill. Ind.— X/. 



Murchisonia bellicincta, Hall. Pal. N. Y. Vol. 1, 1847, 

 1 1 \ ^^^K w^^ ^^^^ identifies Emmons' Pleuroto- 

 II.O. ^.^^ ^^^^^ ?inGeol. 2d. Dist. N.Y.I 842, 



page 396, fig. 107, 6, from the Trenton 

 formation ; but finds the same in the 

 p jA7 g '^^^ Hudson River formation. lie, III I. 



^'^n-'chisonia bellicincta. (Hall, Pal. N. Y. Vol. 1, 1847, 



Trenton and Hud. Kiv. 

 groups.) Emmons, Amer. 

 Geol. 1855, Vol. 1, ii, p. 162, 

 plate 5, figs. 12, Via, 125 (see 

 also fig. 12, and fig. 16.) 

 Shell ornamented by flat 

 ^ A ^— >^^iit*:j™f -^^K spiral band in center, and 



