GRAPTOLITES OF NEW YORK, PART 2 



J 53 



Fig:. S9i 60 D 1 c t y o n e m a 

 pert en tie Foerste. Copies of 

 original figures 



exhibit the characteristic close initial branching which in Dictyonema later 

 is followed by straighter and less divided branches. Our specimen does 

 not show any undisputable dissepiments and is more suggestive of a 

 Desmograptus, but on the supposition that it is but a proximal fragment, 

 the absence or scarcity of dissepiments is in line with other species of 

 Dictyonema [see Mem. 7, p.602]. The thecae have a straight outer margin 

 and do not seem to possess any apertural appendages. 



Dictyonema pertenue Foerste 

 Dictyonema pertenue Foerste. Sci. Lab. Denison Univ. Bui. 1887. 2: 107. pi. 8 



(pi. 8 was issued in v. 3) 

 Dictyonema pertenue Foerste. Geol. Sur. O. Rep't. 



1S93. 7- 600, pi. 27, fig. 27a, b 

 Dictyonema pertenue Gurley. Jour. Geol. 1896. 4:308 



We have not seen any material of this species 



and the latter has been so elaborately described by 



its author that little could be added by further 



investigation. The form is evidently a good species and distinctly separated 



from its Clinton congeners by its finer structure. 



Dictyonema scalariforme Foerste 



Plate i, figure 3 



Dictyonema scalariforme Foerste. Sci. Lab. Denison Univ. Bui. 1887. 2:108, 



pi. 8, fig. 28, 29 (pi. 8 issued in v. 3) 

 Dictyonema scalariforme Foerste. Geol. Sur. O. Rep' t. 1893. 7:600, pi. 27, 



fig. 28, 29 

 Dictyonema scalariforme Gurley. Jour. Geol. 1896. 4:308 



Mr Hartnagel has collected a representative of this species in the red 

 ferruginous shale accompanying the iron ore of the Clinton beds, east of 

 Clinton village, N. Y. Professor Foerste has furnished the following 

 elaborate description of D. scalariforme: 



Frond infundibuliform. Branches of medium size, from once to twice 

 their own width distant from each other, dividing dichotomcusly and con- 

 nected by transverse bars or dissepiments one fourth or one third their 

 width. The dissepiments are stationed at unequal distances from each 



