Spnenophycus latifolius (Hall) 

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Fig. i Example resembling Hall's type. 



Fig. 2 Lobate thallus, showing short conical marginal cavities. 



Fig. 3 A large fragment of thallus, showing at the right lower margin the 



cavities, giving it a lobate appearance. 



Fig. 4 A thallus showing very distinctly the conical marginal cavities. 

 Fig. 5 Large thallus with radiating impressions and cavities. 

 Fig. 6 Small thallus showing perfect margin with cavities. 

 Fig. 7 Thallus with complete outline. 

 Fig. 8 Thallus with broad, partly overlapping lobes. 

 Fig. 9 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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