. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. ; Fio. 1051.—Pterygotua problematlom. carapace, twelve segments instead of thirteen in the body, a bilobate caudal extremity and chelate antennae at the anterior part of the carapace. Type P. problematicuB. acuticaudatus, Pohlman, 1882, Bull. Buf. Soc. Nat. Sci., vol. 4, p. 42, Waterllme Gr. buffaloensis, Puhlman, Bull. Buf. .^oc! Nat. Hist., vol. 4, p. 17, Waterlime Gr cobbi. Hall, 1859, Pal. N. Y., vol. 3, p. 41
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. ; Fio. 1051.—Pterygotua problematlom. carapace, twelve segments instead of thirteen in the body, a bilobate caudal extremity and chelate antennae at the anterior part of the carapace. Type P. problematicuB. acuticaudatus, Pohlman, 1882, Bull. Buf. Soc. Nat. Sci., vol. 4, p. 42, Waterllme Gr. buffaloensis, Puhlman, Bull. Buf. .^oc! Nat. Hist., vol. 4, p. 17, Waterlime Gr cobbi. Hall, 1859, Pal. N. Y., vol. 3, p. 417, Waterlime Gr. cummingsi, Grote & Pitt, 1875, Bull, liiif. Soc. Nat. Hist., vol. 4, p. 18, Water- lime Gr. globicaudatus, Pohlman, 1882, Bull. Huf Soc. Nat. Hist., vol. 4, p. 42, Water- lime Gr. macirophthalmuR, Hall. 1859, Pal. N. Y., vol. 3, p. 418, Waterlime Gr. osborni, Hall, 1859, Pal. N. Y., vol. 3, p. 419, Waterlime Gr. quadraticaudatus, Pohlman, 1882, Bull. Buf. Soc. Nat. Hist., vol. 4, p. 43, Water- lime Gr. Ptychaspis, Hall, 18^3, 16th Rep. N. Y. St. Mus. Nat. Hist., p. 170. [Ety. plyche, fold; aspig, shield.] Cephalic Hliield broad, with wide depressed convex cheeks; glabella cylindrical, convex, transversely lobed, prominent in front; eyes anterior to the middle; facial suture cutting the anterior border almost in front of the eye, and from below the eye it proceeds obliquely to the base a little without the center of the cheek, leaving the movable cheek near the size of the fixed cheek; movable cheek sub- trpr)ezoidal, border thickened, and ex- tended backward in a spine. Type P. miniscensis. barabuensis, Winchell, 1864, Am. Jour. Sci. and Arts, 2d ser., vol. 37, p. 230, PotMlam Gr. granulosa, Owen, 1852, (Dikeloceplialus granulosus,) , Iowa, and Minn., p. 575, Potsdam Gr. miniscensis, Owen, 1852, (Dikelocepbalus miniscaensis,) Geo. Wis., Iowa, and Minn., p. 574, Potsdam Gr. minuta, Whitfield, 1878, Ann. Rep. Geo. Sur. Wis., p. 55, and Geo. of Wi
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