GRAPTOLITES OF NEW VOKK, PART 2 



•95 



the form in his manuscript. Our specimens tally completely with this 

 description, which we publish in the following' : 



Polypary of general dendroid aspect; main branches mostly i— 1.5 mm 

 thick, a width of 2 mm being only seen once, immediately below a bifurca- 

 tion. Branching not very regular. Usually at the proximal end several 

 branches are somewhat clustered and diverge thence radiating!)'. On 



FipT' 97i 98 Acanthograptus Walkeri (Spencer). Enlargements (x 5) of portions showing the branchlets 

 and thecal apertures. Originals from the Rochester shale at Middleport, N. Y. 



one specimen, which I hardly feel able to separate, the branching is 

 rather more from a main axis. The branches, especially the main ones, 

 are thickly beset (spinose shaggy) with the long blunt, obliquely upward 

 directed denticles, which are about 25 in the space of 25 mm. They 

 differ much in appearance in different parts of the polypary, if indeed there 

 are not more than one kind of them. Sometimes on the main stem they 

 are blunter (about 1.0 mm long and 0.75 mm wide at base) while on the 

 branches and branchlets they are less blunt. But on the main stem and 



