49 2 NEW YORK STATE MUSEUM 



PLATE 2 



Genus dictyonema Hall 



See plates i, 3-5 



Dictyonema subretiforme (Spencer) 



Page 162 



1 Large rhabdosome expanded 



2 A smaller rhabdosome compressed laterally and showing the proximal 



parts 



Rochester shale, Middleport, N. Y. 



Dictyonema polymorphum Gurley 



See plate 3, figures 4-6 

 Page 158 



3 Large rhabdosome (homoeotype) 



Rochester shale, Middleport, N. Y. 



Genus inocaulis Hall 



See plate 7 



Inocaulis plumulosus Hall 



See plate 7, figures 1, 2 

 Page 188 



4 Fragment of rhabdosome showing distal portions of branches with 



tubular branchlets and impressions of their apertures on the cast of 

 the branches 



Niagara limestone, Hamilton, Ontario 



Genus cvcloqraptus Spencer 

 Cyclograptus rotadentatus Spencer 



Page 184 



5 Large specimen from the Clinton group, Clinton, N. Y. (homoeotype) 



All figures are drawn in natural size ; the originals of figures i, 2, 3, 

 5 are in the New York State Museum ; that of figure 4 is in 

 the National Museum. 



