Page:The Eurypterida of New York Volume 1.pdf/381

 the fact that the European species,   and  , which possess similar rounded free rami and have afforded the entire chelicerae, also demonstrate that the fixed ramus is correspondingly formed, and that these characters of the chelicerae appear even in younger individuals. We insert here a sketch of the chelicera of, whose free ramus possesses the greatest similarity to that of our type, in order to show the probable form of the entire chelicera of.

The second suggestion, above advanced, that  may be only a variety, is also refuted by the evidence from the European material, which demonstrates that the chelicerae are very good indicators of specific distinction. The chelicerae of the  group are almost identical with those of   Barrande, while those of the associated   correspond closely to those of   Semper, found with   in the Bohemian Upper Siluric stage.