PALEONTOLOGIC CONTRIBUTIONS FROM THE NEW 

 YORK STATE MUSEUM 



BY RUDOLF RUEDEMANN 



The following notes are written to direct attention to some of the 

 observations of broader interest made by the writer in recent years, 

 mainly in connection with the monographic treatment of the Upper 

 Ordovician of New York; 



They deal with the following subjects: 



1 Homoeomorphic development of so-called species and genera of 



Graptolites in separate regions 



2 On sex distinction in fossil Cephalopods 



3 On some cases of reversion in Trilobites 



4 On color bands in Orthoceras 



5 A new Eurypterid from the Devonian of New York 



6 Preservation of alimentary canal in an Eurypterid 



7 Note on Caryocaris Salter 



8 Fauna of the Dolgeville beds 



9 Additions to the Snake hill and Canajoharie faunas 



ID The age of the Black shales of the Lake Champlain region 

 II The Graptolite zones of the Ordovician shales of New York 



I Homoeomorphic Development of So-called Species and Genera 

 of Graptolites in Separate Regions 



We wish to state here a clear case of the development, in the same 

 direction but in separate regions, of several forms from a common 

 species. 



The axonophorous graptolite Glossograptus quad- 

 rimucronatus has a worldwide distribution. It was first 

 described by James HalP from the Gloucester (" Utica " shale) of 

 the Lake St John district in Labrador, but is now known from 

 numerous localities in eastern Canada and New York, as well as 

 from Scandinavia, Great Britain and Australia (Victoria). In the 

 Lake St John district the type form occurs in beds of late Utica age, 

 and in New York this form is found in the Atwater and Deer River 

 shale of late or post-Utica age. In Europe it occurs in beds of 



^For bibliography, see Ruedemann, Graptolites of New York, pt. 2, 1908, 

 p. 385. 



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