GRAPTOLITES OF NEW YORK. PART 1 



601 



iug a lengtli of 5 cm and more.^ Suspended from a thin, long nema \_see 

 description of genus for discussion of mode of fixation and existence of 

 D. flabelliforiue]. 



Branches about . 4 mm ^vide, subparallel, rigid, bifurcating at long 

 intervals, distant a little more than 1mm (about 18 in 20 mm), con- 

 nected by dissepiments, which are about half as thick as the branches 

 and separated by intervals twice as wide as the latter, 

 thus forming meshes with the branches which are about 

 twice as long as wide. Thecae (nourishing individuals) 

 disposed on the inside of the branches, forming short, 

 acutely pointed or mucronate processes, numbering about 

 14: to 16 in 10 mm. Smaller apertures noticeable along 

 the lateral sides of the branches. 



Position and localities. Uppei- Cambric graptolite 

 shale of Schaghticoke, Rensselaer co. N. Y., in association 

 Asdth S t a u r o g r a p t u s d i c h o t o m u s Emmons 

 ( = Clouograptus proximatus Matthew). Yery 

 frequent also in black slate at various localities in the 

 slate belt in Washington count}', N. Y., specially about 

 (xranville, as at North Grranville, Hillsdale, on Hatch 

 hill, on Marion hill near South Hartford, in several of 

 ^vhich localities it is also found associated with S t a u r o g r a p t u s 

 d i c h o t o m u s . Near South Hartford it occurs also in a dirty brownish 

 ^veathering limestone. There is little doubt that its distribution extends 

 northward through Yermont. I find for instance young specimens in a 

 shale collected l)y T. N. Dale on Hamilton hill near Fair Haven in southern 

 Yermont. 



The wide distribution of this important index fossil of the closing 

 period of the Cambric in Canada and Europe has been discussed in detail 

 by the present writer [1903]. In Canada it has been reported by Dawson 



Fig. 26 Dictyoneina 

 t'labeUiforme Eich- 

 wald (sp.) Fragment of 

 branch showing lateral 

 view of thecae and aper- 

 tures of flanking tubes 

 ("gonangia"). Schaghti- 

 coke. x5 



^Mr van Ingen informs me that he collected, in the St John basin, specimens 

 having a lengtli of 10 to 12 inches. 



