r Q 2 NEW YORK STATE MUSEUM 



PLATE 7 



Genus inocaulis Hall 



See plate 2 



Inocaulis plumulosus Hall 



See plate 2, figure 4 

 Page 188 



i Enlargement (x 5) of portion of branch to show the form and composite 

 character of the branchlets (by the apertures in one of them on the 

 right hand side). Periderm not shaded in 



2 Enlargement (x 5) of a terminal portion of a branch to show the form 



of the branchlets 



Niagaran limestone, Hamilton, Ontario. 



Genus acanthograptus Spencer 



See plate 6 



Acanthograptus granti Spencer 



See plate 6, figure 3 



3 Enlargement (x 5) of distal portion of rhabdosome, introduced for com- 



parison with Inocaulis and Palaeodictyota 

 Niagaran limestone, Hamilton, Ontario. 



Acanthograptus walked (Spencer) 



See plate 6, figures i, 2 

 Page 194 



4 Enlargement (x 5) of fragment of branch to show the composite charac- 



ter of the branchlets, indicated by the apertures of thecae 

 Niacaran limestone, Hamilton, Ontario. 



Genus palaeodictyota Whitfield 



.S'.r plate 6 



Palaeodictyota chntonensis sp. now 



See plate fi, figure 5; plait S, figure 3 

 Page 203 



5 Enlargement (x 5) of portion of rhabdosome showing the anastomosis 



of the branches, and where the periderm is broken away (lighter- 

 shaded parts) the apertures of thecae 

 Clinton shale, Clinton, N. Y. 



