. Annals of the New York Academy of Sciences. Science; Science -- New York (State). 18 North American Palaeozoic Crustacea. snblevis, Packard, 1882; Am. Naturalist, p. 952, fig. 11. snbhpvis, Packard, 1883; 12th Rept. U. S. Geol. Survey Terr., p. 450, fig. 71b. sublevis, Beecher, 1884; 2d Geol. Survey Peiina., vol. PPP, p. 5. subljEvis, Jones & Woodward, 1884; Geol. Mag., Dec. 3, vol. 1, p. 2, pi. 13, figs. 3, 4, 5. subL-evis, Etheridge, Woodward & .Jones, ISSf); 3d Rept. Comm. Fossil Phyllopoda Pal. Rocks, p. 35. sublfevis. Hall & Clarke, 1888; Pal. New York, vol. 7, p. 17(j, pi.
. Annals of the New York Academy of Sciences. Science; Science -- New York (State). 18 North American Palaeozoic Crustacea. snblevis, Packard, 1882; Am. Naturalist, p. 952, fig. 11. snbhpvis, Packard, 1883; 12th Rept. U. S. Geol. Survey Terr., p. 450, fig. 71b. sublevis, Beecher, 1884; 2d Geol. Survey Peiina., vol. PPP, p. 5. subljEvis, Jones & Woodward, 1884; Geol. Mag., Dec. 3, vol. 1, p. 2, pi. 13, figs. 3, 4, 5. subL-evis, Etheridge, Woodward & .Jones, ISSf); 3d Rept. Comm. Fossil Phyllopoda Pal. Rocks, p. 35. sublfevis. Hall & Clarke, 1888; Pal. New York, vol. 7, p. 17(j, pi. 29, figs. 11-13. sublevis, Etheridge, W'oodward & .Jones, 1888 ; 6th Rept. Comm. Foss, Phyllopoda, p. 8. Whitfieldi, Clarke, 1885 ; Bull. U. S. Geol, Survey, No. 16, p. 45, pi. 2, figs. 3, 4. Portage, Whitfieldi, Hall & Clarke, 1888; Pal. New York, vol. 7, p. 172, pi. 29, figs. 20, 21. Whitfieldi, Etheridge, Woodward & Jones, 1888 ; 6th Rept. Comm. Foss. Phyllopoda, p. S. Echinognathus, Walcott, 1882; Am. Jour, Sci., 3d series, vol. 23, p. 213. (Jill. Char.—Endognathary limbs (one or more pairs) formed of 8 or 9 joints, 6 of which carry long backward-curving spines articulated to their posterior side. Terminal joint slender, elongate, acuminate. Surface of the body, and larger joints of the cephalic appendage orna- mented with scale-like markings as in the genus Pterygotas. Type E. Clevelandi (Walcott, Am. Jour. Sci., 3d series, vol. 23). Clevelandi, Walcott, 1882 ; Am. Jour. Sci., 3d series, vol. 23, p. 213, figs. 1, 2. Utica Slates. Eurypterus ? Clevelandi, Walcott, 1882 ; Am. Jour. Sci., 3d series, vol. 23, p. 151. Elymocaris, Beecher, 1884 ; 2d Geol. Survey Pennsylvania, vol. PPP, p. 13. Diagnosis.—Carapace bivalvular, hinge-line straight and extending nearly the entire length of the valves. Outline or sub- ovate. Surface gently and evenly convex. Cei)lialic region smootli or marked by two low broad nodes ; optic node usually distin
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