GRAPTOLITES OF NEW YORK, PART 2 417 



lower Utica beds at Dolgeville but completely covers certain layers in the 



higher bctls at Flat creek near Mohawk village. It is also found north 

 of Utica, near Amsterdam, etc. 



In the Lake Champlain region I have collected it along the Panton 

 shore in Vermont in the beds transitional from the Trenton limestone to 

 the Utica shale, where it is associated with Glossogr. q u a d r i m u c r o - 

 natus and G. (?) eu char is. 



An occurrence in the lower Lorraine (Frankfort) beds at Waterford 

 [see Bui. 42, p. 514] indicates that this species may also enter the Lorraine 

 sta^e, but I have not observed it in collections from the higher Lorraine 

 beds. 



Ami has recognized C. putillus in the Utica terrane of the 

 Ottawa outlier in Canada. Nicholson has identified a form from the Con- 

 iston flags of Skelgill Beck, near Ambleside, Scotland, with Hall's species. 

 The identity of the two seems to be open to doubt, since the Scottish form 

 is coarser in its dimensions, widens very gradually (judging from Nicholson's 

 drawing) and has but 25 thecae in 1 inch. Tullberg has named a zone in 

 Scania after this graptolite. 



Remarks. This species was described by Hall in the introduction to 

 his Graptolites of the Quebec group [p. 44] as presenting a modification of 

 the general arrangement of the thecae in the ordinary forms of Diplograptus 

 in so far " that the apex of one theca barely reaches the base of the next 

 succeeding." This conception is due to the approach of the second half of 

 the theca to a direction subparallel to the axis of the rhabdosome. Hall's 

 excellent figures [see copy in text fig. 368] and the type specimen [refigured 

 fig. 369] fail to show the proximal half of the theca, which as shown by 

 another specimen on the same slab with the type [see fig. 370], is over- 

 lapped by the preceding theca. There is hence an overlap, though it is 

 notably smaller than in other American Diplograpti. In the change of the 

 growth direction of the thecae and the slight overlap this form shows a 

 decided approach to Climacograptus, which in compressed specimens is 

 brought out still more distinctly by the appearance of the apertures as trans- 



