. The Eurypterida of New York. Eurypterida; Paleontology. 4l6 NEW YORK STATE MUSEUM Pterygotus ? (Eusarcus) nasutus nov. See text figures 102, 103 A number of carapaces from Catskill fail to show any distinguishing features from Pterygotus? (Eusarcus) nasutus (de- scribed on p. 382) from the Schenectady beds at Schenectady, and we there- fore refer them to that species, although the considerable difference in >o2 103 age between the forms makes it some- what improbable that they are con- specific. The sculpture is well shown in several specimens and consists of flat closely arranged rather
. The Eurypterida of New York. Eurypterida; Paleontology. 4l6 NEW YORK STATE MUSEUM Pterygotus ? (Eusarcus) nasutus nov. See text figures 102, 103 A number of carapaces from Catskill fail to show any distinguishing features from Pterygotus? (Eusarcus) nasutus (de- scribed on p. 382) from the Schenectady beds at Schenectady, and we there- fore refer them to that species, although the considerable difference in >o2 103 age between the forms makes it some- what improbable that they are con- specific. The sculpture is well shown in several specimens and consists of flat closely arranged rather large nodes or tu- bercles, as in Eusarcus linguatus. Fig. 102, 103 PteryROtus' (Eusarcus) nasutus nov. Two carapaces showinij the A liVp qnilntlirp it; c;lin\,vn in <;nmf nf thp characteristic angular front and the position ^ ^^^"^ bt-UipUUie lb SIlUWIl IIJ SUIIIC Ui Llie of the eyes. Fig. 102 x 2: (ig. loj x . - il o 1 j 1 1 1 Specimens from the Schenectady shale. In the first description the species is assigned to Pterygotus, but the closely related species from these Normanskill shales, Eusarcus linguatus, indicates that it may more likely be an Eusarcus. Pterygotus nonnanskillensis nov. Sec text figure 104 This name is proposed for carapaces of distinctly pterygotoid aspect. Carapace broadly subrectangular, three fourths as long as wide; lateral margins subparallel, slightly convex, antelateral angle distinct, abruptly rounded; anterior margin broadly and evenly convex. Basal margin slightly concave in middle, postlateral angles approximately rectangular. Lateral eyes marginal, situ- ated in the antelateral comers, elliptic, small, less than one fourth the length of the carapace. Surface sculpture not seen. Measurements of type specimen, length, ii Fig. 104 pterygotus -'^ ^ ' *= ' nonnanskillensis mm, width, 15 mm. Trepa"lielli^nes indicate the cleavage lines appear- The presence of a genus of the Pterygotus group jj]^^" ^^^ carbonaceous. Please note
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Keywords: ., bookcentury1900, bookdecad, booksubjectpaleontology, bookyear1912
