716 NEW YORK STATE MUSEUM 



close arrangement and direction of thecae, still falling within the boundaries 

 of the original description of that species, differs distinctly by the absence 

 of the long apertural macros and generally less compact or truncate shape. 

 Its outline is uniformly oval, with the broader part forming the sicular end 

 [pl.l5, fig.28, and text fig,99], and it is always small, none of the specimens 

 surpassing 6 mm in length. This mutation I propose to designate as P. anna 

 mut. pygmae u s. It is however possible that this is a last and pygmaean 

 mutation of P. ilicifolius. 



Several specimens of this species distinctly show a fine chitinous thread 

 passing longitudinally through the rhabdosome, which has the appearance of 

 being the nema of the sicula, incorporated into the rhabdosome. 



Grenus incertae sedis 



STROPHOGRAPTUS gCU. UOV. 



Etymology : sirophos, bent ; grapho, I write. 



Description. Bundles of long, thin, flexuous, carbonaceous, subparallel 

 fibers which do not bifurcate. Thecae not projecting from branch or 

 rhabdosome (?), thecal apertures appressed in one row. Virgula not observed. 

 Apertures connected by median depressions (perhaps of secondary origin and 

 indicating the position of the coenosarc). 



Memarhs. The type species of this genus, S t r o p h o g r a p t u s 

 t r i c h o m a n e s , occurs in numerous bundles of fibers on the slabs of 

 graptolite bed 6, zone with Diplograptus den tat us. Bundles of 

 finer and unbranching fibers are also found on slabs of the preceding zones. 

 As these masses are intermixed with the typical graptolites, consist of the 

 same carbonaceous matter and exhibit regularly distributed thecal apertures, 

 but can not be referred to any of the graptolite genera with which they are 

 found associated, they must be recognized as representing a separate generic 

 type. 



Emmons established a genus, Nemagrapsus [1855, 2:109], for threadlike, 

 chitinous bodies, and described two species, viz N . e 1 e g a n s and 

 N . c a p i 1 1 a ]• i 8 . The first was recognized by Hall as being based on a 



