274 PALAEONTOLOGY OF NEW-YOKK. 



331. 12. GRAPTOLITHUS SERRATULUS («.«/).). 



Pl. LXXIV. Figs. 5 a, b. 



Stipe Straight, slender, almost filiform, widely diverging from an acute point ( the 

 basel); upper or inner edge serrated; teeth triangular, distant nearly the width of the 

 stipe; serratures nearly as deep as half the width of the stipe. 



This species closely resembles the G. Sagittarius, but differs in the greater obliquity of 

 the serratures and the distance of the points of the teeth, which are, in this specimen, 

 equal to that species where the stipe is more than twice as wide. This character may prove 

 sufficiently distinctive to identify small fragments of the two species. 



Fig. 5 a. A specimen of the natural size, diverging from a slender smooth spine or mucronate radicle 



below. 

 Fig. 5 b. A portion magnified, showing the form and opposite direction of the serratures at the base. 



Position and locality. This is found, associated with several of the preceding species, in 

 the black slates at Norman's kill, near Albany. 



332. 13. GRAPTOLITHUS GRACILIS (71. s;?.). 



Pl. LXXIV. Figs. G a, b, c, d. 



Stipe very slender, branching from one or both sides ; branches slender, gradually 

 enlarging, sometimes dividing, distinctly serrate ; serratures oblique ; teeth distant, ap- 

 pressed, or scarcely distinguishable above the outline of the branches. 



This is much the most slender and graceful species among the Graptolites. In the 

 examination of a large number of specimens, I have not been able to learn that the 

 principle stipe is serrated, though the branches are distinctly so on one side. 



Figs. G a, b. Two specimens, natural size, showing the principal stipe and branches, one of the latter 



being subdivided. 

 Fig. 6 c A specimen in which the principal stipe is obscure; several branches are subdivided. 

 Fig. 6 (2. A fragment magnified, showing the serratures of the branches. 



Position and locality. This species is only known to me in the black slates on the 

 Norman's kill, near Albany. 



333. 14. GRAPTOLITHUS? L^VIS (n. 5/).). 



Pl. LXXIV. Fig. 7. 



Stipe slender, linear, flexuous, smooth on both margins ; not branched. 



This fossil presents the same appearance as the Graptolites, and occurs in the same 

 position. I have several specimens, all presenting a uniform character ; and from its being 

 of conunon occurrence, I have figured it in this connection. 



Position and locality. In the Utica slate, at Turin, in Lewis county. 



