590 



PALJIONTOLOGY OF NEW-YORK. 



the name, so far as I know, except in a 

 newspaper report at the time. At that time, 



1 had seen but a lew fragments of the species, 

 tlie first one having been discovered by Mr. 

 J. B. Ellis of Albany; and it is only since 

 the descriptions were in type that the speci- 

 men, from which the accompanying figure 



2 has been made, was discovered by Mr. 

 Whitfield among the shales at Normanskill. 

 The constancy of the generic characters in 

 two distinct species, and in at least half a 

 dozen specimens, affords satisfactory evi- 

 dence for separating this from any described 

 forms. 



Fig. 2. 



' Thamnograptus typni*. 



Tliauiiioj^raptus capillaris ( n. s.). 



Stipe extremely slender, flexuose or slightly divergent at the junction of 

 the branches : branches diverging nearly at right angles to the stipe, 

 capillary; branchlets less divergent. Surface of stipe and branches 

 marked by numerous indentations, which may indicate the place of 

 cellules ? Substance of the stipe, branches and branchlets, nearly cy- 

 lindrical. 



This species is an extremely slender form; the stipe, as 

 preserved, being capillary, and the branches and branchlets 

 still finer. It is not improble that what appears in the fragment 

 as the main stipe, is a branch of a larger one; but its form 

 and mode of branching preclude its identity with the preceding 

 species. 



The figure is from a fragment of this species, twice enlarged. 



Geological position and locality. In the shales of the Hudson- 

 river group : Near Albany. 



Thamnograptus capiUaris. 



