. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. m 646 CHUSTACEA. [SCH. \:\\ punctata, Hall, 1863, (Ceratiocaris punc- tata,) 16th Kep. N. Y. St. Mus. Nat. Hist., p. 74, Ham. Gr. puBtuIoea, Whitfield, 1880, Am. Jour. Sci. and Arts, 3d ser., vol. 19, p. 38, Erie Bhalea. Bocialis, Beecher, 1884, Rep. of Prog. Pa. Geo. Sur. PPP, p. 10, Ciiemung Gr. Bubleevis, Whitfield, 1880, Am. Jour. Sci. and Arts, 3d ser., vol. 19, p. 36, Erie whitfieldi, Clarke, 1886, Bull. U.
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. m 646 CHUSTACEA. [SCH. \:\\ punctata, Hall, 1863, (Ceratiocaris punc- tata,) 16th Kep. N. Y. St. Mus. Nat. Hist., p. 74, Ham. Gr. puBtuIoea, Whitfield, 1880, Am. Jour. Sci. and Arts, 3d ser., vol. 19, p. 38, Erie Bhalea. Bocialis, Beecher, 1884, Rep. of Prog. Pa. Geo. Sur. PPP, p. 10, Ciiemung Gr. Bubleevis, Whitfield, 1880, Am. Jour. Sci. and Arts, 3d ser., vol. 19, p. 36, Erie whitfieldi, Clarke, 1886, Bull. U. S. Geo. Sur. No. 16, p. 45, Ham. Gr. wrightana, Dawson, 1881, (Equisetides wrightanuB,) Quar. Jour. Geo. Soc., vol. 37, p. 301, Portage Gr. EcniNOONATHUB, Walcott, 1882, Am. Jour. Sci. and Arts, 3d ser., vol. 23, p. 213. [Ety. echinos, sea urchm; gnathoa, jaw.]. Founded upon fragments; endogna- tharv limbs (one or more pairs) formed of eight or nine joints, six of whicli carry Ions, backward curving spincH, articulated to their posterior side; ter- minal joint slender, elongate, acumi- nate; surface of body with scale-like markings. Typd E. clevelandi. clevelandi, Walcott, 1882, Am. Jour. Sci. and Arts, 3d ser., vol. 23, p. 213, Utica Slate Gr. ElmP80CEPHALUS, Zenker, 1833, Beitragc zur Naturgeschichte der Urwelt, p. 51. [Ety. ellipsis, ellipse; kephale, bead.] Broadly ovate; cephalic shield semi- circular, depressed, without spines; flabella subquadrangular, rounded in ront, without transverse furrows; eyes oblong, lunate, narrow, projecting out- ward ; sutures short, commencing at the aii^'jrior margin, in front of the eyes, and carving over them toward the posterior angles; thoracic segments twelve, axis nearly as broad as lateral lobes; pygidium small, semicircular, trilobed. Type E. hoffl. ? curtUB, Whitfield, 1877, Ann. Rep. Geo. Sur. Wis., p. 58, and Geo. Wis., vol. 4, p. 191, Potsdam Gr. Founded upon a fragment of the cephalic shield, and the generic referenc
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