GRAPTOUTES OF NEW YORK, PART 2 5; 



with our present knowledge, of little value for correlation with the European 

 graptolite zones, since it is obvious that most, or probably all of these forms 

 were sessile to the bottom of the sea and hence living under conditions that 

 were totally different from those surrounding the Graptoloidea or true 

 graptolites. It is, however, possible that a revision and more detailed 

 description of this fauna will furnish the means of a closer comparison with 

 the numerous Dendroids made known from the Siluric of Bohemia. 



Of greater interest, as far as concerns a possible correlation with extra- 

 American graptolite horizons, is the single representative of the Grapto- 

 loidea of the Upper Niagaran, viz, Cyrtograptus ulrichi sp. nov 

 It comes from the upper part of the Bainbridge limestone (corresponding 

 to late Niagaran), Bainbridge, Cape Girardeau county, Mo. and is the first 

 Cyrtograptus discovered on this continent. It is very closely related to or 

 possibly a vicarious form of C. lundgreni Tullberg. Since that form 

 is restricted to the zone with C. carruthersi which is the uppermost 

 zone of the Middle Siluric, and would hence well correspond to the location 

 of our graptolite in the Missouri beds, the inference of the presence of that 

 graptolite zone in the Mississippi basin cannot be far from the truth. 



6 Devonic 



In contradiction to the old axiom that the graptolites are Siluric index 

 fossils par excellence, the American Devonic has furnished an ever increas- 

 ing list of graptolites until the number has now grown to 1 1 from the 

 United States and 2 from Canada. The following is a tabulation of the 

 forms from the United States: 



