Spnenophycus latifolius (Hall) 

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Example resembling Hall's type. 



Lobate thallus, showing short conical marginal cavities. 



A large fragment of thallus, showing at the right lower margin the 



cavities, giving it a lobate appearance. 

 A thallus showing very distinctly the conical marginal cavities. 

 Large thallus with radiating impressions and cavities. 

 Small thallus showing perfect margin with cavities. 

 Thallus with complete outline. 

 Thallus with broad, partly overlapping lobes. 

 Thallus showing parallel, distally diverging lines and a medial row 



of double pits, doubtfully referred here. 

 Fig. 10 Thallus with extremely lobate outline. The specimens, figures 4-6, 



8-10, only doubtfully referable to this species. 

 Horizon and locality. Schenectady beds. Aqueduct near Schenectady, N. Y. 

 All figures are natural size. The originals are in the State Museum. 



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