940 NEW YORK STATE MUSEUM 



mens than have been collected thus far, a difference which, 

 however, is of no or little import. A differential character, 

 however, which necessitates consideration lest hasty indentifi- 

 cation might ensue, is the rapid twofold dichotomy in the 

 Schaghticoke specimens, which, as in Olonograptus 

 proximatus, leads to a crosswise branching in the center, 

 while Olonograptus milesi possesses a " funicle " of 

 considerable length. 



On the other hand, Clonogr. milesi is closely related to 

 Olonograptus tenellus Linnarsson (sp.) , a species 

 which is found in Scania in beds intimately connected with the 

 Dictyonema flabelliforme slate. In view of this 

 relationship of Olonograptus milesi, it is important 

 to note that that species does not belong to the Quebec group, as it 

 is usually cited, 1 but was derived from the slates at Georgia Vt. 



Hall says in regard to the provenience of his material : 



The specimen from which the figures of this species were de- 

 rived, is part of a boulder of Georgia slate, picked up in Monk- 

 ton by Henry Miles of Monkton . . . The boulder was probably 

 derived from the Georgia slate, either in Georgia or St Albans. 



This citation is evidently not to be understood as meaning that 

 Olonograptus milesi is a form of the Georgian or Lower 

 Cambric formation; but it may be concluded with a fair degree 

 of certainty that it came from Cambric slates lying somewhere 

 near the top of the Cambric formation, and it is possible that 

 this occurrence indicates the presence of another subzone in the 

 Upper Cambric. 



The discussion of the relations of the species of Bryograptus, 

 cited in the list of the fossils of the Olonograptus bed, is reserved 

 for the forthcoming description of the graptolite fauna of New 

 York. 



Lingula. A brachial valve of a linguloid form, about 9 mm 

 long ; perhaps referable to Lingulella concinna, a 

 species described by Matthew from the Dictyonema horizon of 

 McLeod brook, Boisdale, Cape Breton island. The Schaghticoke 

 specimen appears more uniformly oval, but Mr Matthew's speci- 

 men is flattened out anteriorly and posteriorly, as appears from 



1 Miller's North American Geol. and Pal. p. 190. 



