49O NEW YORK STATE .MUSEUM 



PLATE i 



Genus callograptus Hall 

 Callograptus compactus ( Walcott) 



Page 146 



i Rhabdosome with adhesion disk (topotype) 



Utica shale, Holland Patent, Oneida co., X. Y. 



Genus DESAiooRAPTUS Hopkinson 



See plates 4. 5 



Desmograptus tenuiramosus sp. now 



Page 177 



2 Type specimen (holotype) 



Normanskill shale, Glenmont, Albany co., N. Y, 



Genus dictvonema Hall 



See plates 2-5 



Dictyonema scalariforme Foerste 



Page 153 



3 Fragment of rhabdosome 



Ferruginous Clinton shale, Clinton, N. Y. 



Dictyonema spiniferum sp. now 



Page 151 



4 Fragment of rhabdosome (holotype) 



Normanskill shale, Glenmont, Albany co., X. Y. 



Dictyonema gracile Hall 



Page 157 



5 Rhabdosome retaining proximal portion (homoeotype) 



Rochester shale, Middleport, N. Y. 



