. The Eurypterida of New York. Eurypterida; Paleontology. THE EURYPTERIDA OF NEW YORK 413 adaptation to particular marine conditions. Similar stability of the eurypterids is also suggested by the identity or extremely close relation- ship of the species in the Shawangunk grit at Otisville and the possibly older beds at the Delaware Water Gap and Swatara Gap [see p. 417] in Pennsylvania; and again in the probably somewhat younger McKenzie formation of Pennsylvania [see p. 88], and finally also by the continuation of the same genera apparently from the Ordovicic, but surely from the Siluric into
. The Eurypterida of New York. Eurypterida; Paleontology. THE EURYPTERIDA OF NEW YORK 413 adaptation to particular marine conditions. Similar stability of the eurypterids is also suggested by the identity or extremely close relation- ship of the species in the Shawangunk grit at Otisville and the possibly older beds at the Delaware Water Gap and Swatara Gap [see p. 417] in Pennsylvania; and again in the probably somewhat younger McKenzie formation of Pennsylvania [see p. 88], and finally also by the continuation of the same genera apparently from the Ordovicic, but surely from the Siluric into the Carbonic. The eurypterids are then, as a rule, to be accorded but little value for purposes of correlation. The following species are quite obviously but a meager part of the eurj^pterid fauna of the Normanskill stage, and future discoveries, now that the attention of collectors is directed to these interesting fossils, will undoubtedly add much to the list. As in the Schenectady shale the generic determinations are entirely provisional, as but few legs and telsons have been found in connection with the carapaces and fragmentar}- abdomina. Eurypterus chadwicki nov. 5tv text figure 95 Carapace semioval to semicircular; lateral and frontal margins form- ing a uniformly rounded curve; length to width as 2:3; basal margin straight transverse. All margins apparently with a broad flat border. Lateral eyes large, about one fourth the length of the carapace, elliptical in outline, prominent, situated for- / > ward, in front of the middle transverse line, less than tmr their length distant from the margin. Length of cara- pace of type, mm; width, mm. '''?"h''idwi'ck?*^nov' Holotype. x Eusarcus linguatus nov. See text figures 96, 97 Carapace semioval, with a tonguelike process in front; length to width as 4:5. Lateral margins moderately convex; frontal margin produced into a squarish process with rounded anterior angles; one. Please note that these images are e
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Keywords: ., bookcentury1900, bookdecad, booksubjectpaleontology, bookyear1912
