$j8 NEW YORK STATE MUSEUM 



PLATE 10 



Genus mastigograptus nov. 



See plates 9, n, 12 



Mastigograptus tenuiramosus ( Walcott) 



See plate 9, figures 2, 3; plate 11, figures 1-4; plate 12, figures 1. 2 

 Page 216 



i Fragment of rhabclosome with conical appendages 

 Lower third of Eden shale, Covington, Ky. 



Mastigograptus gracillimus (Lesquereux) 



Page 219 



2 Specimen from type locality (topotype) 



Eden shale, bed of Licking river, Covington, Ky. 



Mastigograptus circinalis sp. now 



See plate 12, figures 7, 8 

 Page 222 



3 Fragment of shale with specimens (cotypes) 



Utica shale, Rural cemetery, Albany, N. Y. 



Genus thamnograptus Hall 



See plate 12 



Thamnograptus capillaris (Emmons) 



See plate 12, figures 9-16 

 Page 200 



4 Hall's type of T h. capillaris 



5 Fragment of rhabdosome with finer branchlets preserved ; to illustrate 



original habitus of form 



6 Branch showing the " Rastrites "-aspect and nature ol apparent denticles 



as bases of branches 



7 Large distal fragment of main stipe with few secondary branches. 



Shows nodes of main stipe and " Rastrites "-aspect of secondary 

 branches 



