GRAPTOLITES OF NEW YORK, PART 2 



185 



We have but one specimen | pi. 2, fig. 5]' which is in the New York 

 State Museum and labeled: Clinton group, Clinton, Oneida co. It is from 

 the reel, stronglv ferruginous shale of the kind that directly overlies the 

 Clinton iron ore, and surpasses in size Spencer's type, obviously his largest 

 specimen, several times, but does not differ in the thickness, number of 

 branches and frequency of bifurcation and is therefore in the absence of 

 more complete collections from 

 either the Lockport or Clinton beds 

 quite properly identified with the 

 species from Hamilton. 



The dimensions of our specimen 

 are : Diameter of disk 20 mm, that 

 of rhabdosome 25 mm ; width of 

 branches not more than .2 mm out- 

 side of the disk. There are two 

 concentric zones of bifurcation, the first like the one in Spencer's type, 

 about 5 mm from the center, the second is again as far out. There are 

 counted 55 branches along the periphery. The thecae are only seen in 

 frontal view, as indistinct pores; they seem to number 20 in 10 mm. 



Fig. 91, 92 Cyclograptus rot a dent at us Spencer. 

 Fig. 91 Original figures. Fig. 92 Enlargement (x 5) of 

 part of specimen from Clinton shale showing composition 

 of branches of thecae 



inocaulis Hall 



Hall founded this genus [Pal. N. Y. v. 2] on one species, I . p 1 u m u - 



1 o s u s, a form of the Rochester shale of New York, giving the following 



diagnosis : 



A plantlike, corneous coral with numerous bifurcating branches ; struct- 

 ure fibrous or plumose. The texture of this coral similar to the graptolites, 

 a black, scalv crust or film being all that remains of the substance. From 

 the specimens examined, it appears to have grown in groups, with rounded or 

 flattened stems, which are dichotomous above, and more or less spreading. 

 The structure is too peculiar to be mistaken, or referred to any established 

 genus. 



1 We have since collected more specimens in the shale overlying the lower ore bed at 

 the same locality. 



