778 NEW YORK STATE MUSEUM 



27 An enlargement (x2) to show more distinctly, the direction of the thecae 

 The cui'vature of the thecae is more uniform on the right side than 

 it is traced in the figure, and the mucros are lancet-shaped. 

 Top of graptolite bed 2 of the Deep kill section 



28—30 Specimens showing the dwarfed and ph^logerontic condition of the 

 species at the disappearance of the genus in the horizon with 

 D i p 1 o g r a p t u s d e u t a t u s ( P . a n n a . m u t . u 1 1 i m u s ) . 

 Figure 28 in natural size, the oi'iginal from the Ash hill quarry, 

 Mt Moreno, Columbia co. N. Y.; figures 29 and 30, x2, the originals 

 from graptolite bed 6 of the Deep Mil section. In figure 29 the 

 lithographer has left out the last thecae at the sicular end. 



Phyllograptus angustifolius 



Page TU 



31 Specimen showing the common expression of the species at the Deep kill 



section but incorrectly traced. 

 Graptolite bed 6 of the Deep kill section 



32 A very narrow form 



Graptolite bed 2 of the Deep kill section 



33 Specimen from graptolite bed 5. x2^. The thecal walls have been 



reproduced incorrectly by the lithographer. They are nearly straight 

 in the original. 



34 Fragment of young rhabdosome showing the growing end. . x2 



Graptolite bed 6 of the Deep kill section 



Phyllograptus typus Hall 



Page 708 



35-37 Specimens showing the variation in the outline of the rhabdosome 

 Graptolite bed 3 of the Deep kill section 



