236 NEW YORK STATE MUSEUM 



Position and localities. This species is common and beautifully pre- 

 served in the collections from the Normanskill shales in the cut of the 

 West Shore Railroad near Glenmont, south of Albany. It is also found 

 in numerous other localities in the slate belt of New York, where the Nor- 

 manskill zone is exposed and has been reported by the writer | 1901] from 

 a number of these in the neighborhoods of Albany, Troy and Castleton. 

 It is further recorded in Dr Gurley's manuscript from Stockport, Columbia 

 co., N. Y., upon identification by Lapworth and has been reported from 

 Canada. 



The type material of the species was found in the " more anthracitic 

 shales" of Dobb's Linn, and of Hartfell near Moffat, Scotland and Lap- 

 worth cites it as occurring in the Hartfell and Moffat shales. 



It is also mentioned by Linnarsson as occurring in Scania in associa- 

 tion with Glossogr. quadrimucrohatus, D i p 1 o g r . f o 1 i a c e u s, 

 Climacogr. bicornis and other forms. 



Remarks. The original description of this species is : 



The stipe varies in length from ^ to ^ inch, and has an average 

 breadth of l / 20 inch ; the base, or proximal extremity, is provided with two 

 small, slightly diverging spines or mucros which are wanting in other less 

 perfect specimens, when the stipe terminates below by tapering to a point. 

 There are no cellules, the lateral margins of the stipe being perfectly plain ; 

 but the polypary expands at its distal extremity into a sort of cup or calyx, 

 the free edge of which is divided into four or five equal or unequal teeth. 

 There are no certain traces of any central solid axis, but the surface of the 

 stipe is sometimes striated. 



It will be seen, that our form agrees fully with this accurate description, 

 and that the Scottish specimens are somewhat larger than the average ot 

 ours, though our extreme specimens approach the maximal measurements 

 of the Scottish types. 



Nicholson figured and described this species as possessing two diverg- 

 ing spines or mucros when perfect [see text fig. 123]. It appears from our 

 material that one of these mucros is the apical point of the sicula, the other 

 its aperture. The misconception may easily have arisen from the peculiar 

 fact that in this species the sicula, apparently under the weight of the 



