BUFFALO SOCIETY OF NATURAL SCIENCES 25 



Barbour has described only one species, Eurypterus {Anthraco- 

 nectes) nebraskensis. It is represented by a large number of indi- 

 viduals and undoubtedly as the beds are worked over a great many 

 more specimens will be obtained. They are for the most part in good 

 condition, though seemingly representing only the exuviae. The 

 individuals are small, averaging two inches in length, the largest not 

 being even three inches long. Barbour figures and describes, but does 

 not name a second form which he thinks may be a species different 

 from E. nebraskensis. 



The faunal associates listed by Barbour are: "innumerable leaves, 

 stems and fragments of certain land plants, conspicuously Neurop- 

 teris pinnules, stems of Calamites, and leaf-whorls of Asterophyllites 

 Intimately associated with the eurypterids were con- 

 siderable amounts of actual plant tissue, preserved as such since 

 Carboniferous times." (10, 507-8). 



Two species, Eurypterus ? pulicaris Salter from the Little River 

 plant bed no. 2 of St. John, New Brunswick, and Eurypterella ornata 

 Matthew are so doubtfully identified that Clarke and Ruedemann 

 do not consider even their eurypterid origin as certain. (39, 93) 

 The horizon at which they were found was originally supposed to be 

 Devonic, but is now known to be Carbonic. 



GREAT BRITAIN 



Siluric. Lower Siluric Llandovery-W enlock. The earliest euryp- 

 terid remains that have been found anywhere outside of North Ameri- 

 ca, are the fragments of Pterygotus problematicus from the May Hill 

 sandstone of upper Llandovery age, found in Eastnor Park near 

 Ledbury, Herefordshire, England. A single chelate appendage was 

 found associated with Nucula eastnori, Pentameri and Stricklandin- 

 iae. The May hill sandstone is a basal one resting by overlap upon 

 various earlier members of the series even upon the Shineton (Dictyo- 

 nema) shales at Wenlock Edge. There is everywhere a marked break 

 and unconformity between the underlying beds and the May Hill 

 sandstone, indicating that the latter was laid down by an advancing 

 sea, if it was not a terrestrial (fluviatile) sandstone reworked by the 

 sea. 



In the Wenlock of the Pentland Hills, Scotland, occurs the first 

 large eurypterid fauna of Europe. The rock containing the euryp- 

 terids is "an irregularly fissile, fine-grained sandstone, containing a 



