500 NEW YORK STATE MUSEUM 



PLATE 6 



Genus acanthoqraptus Spencer 



See plate 7 



Acanthograptus walked (Spencer) 



See plate 7, figure 4 

 Page 194 



i, 2 Two specimens from the Rochester shale at Middleport, N. Y. 



Acanthograptus granti Spencer 



See plate 7, figure 3 



3 A nearly perfect rhabdosome, introduced here for illustration of the 



genus 



Niagaran shale, Hamilton, Ontario. 



Genus palaeodictyota Whitfield 



See plate 3 



Palaeodictyota anastomotica (Ringueberg) 



Page 200 



4 Large typical rhabdosome from the Rochester shale at Middleport, N. Y. 



Palaeodictyota clintonensis sp. now 



See plate 7, figures 5, 6; plate 8, figure 3 

 Page 203 



5 Fragment of proximal portion (cotype) 



Clinton shale, Clinton, N. Y. 



Palaeodictyota bella (Hall and Whitfield) mut. recta nov. 



See plate 7. figure 6 

 Page 204 



6 Type specimen (holotype) 



Clinton shale. Clinton, N. Y. 



All fiofures are drawn in natural size. The originals are in the 

 New York State Museum. 



