. Annals of the New York Academy of Sciences. Science; Science -- New York (State). 16 North American Palaeozoic Crustacea. Belli, Hall & Clarke, 1888; Pal. New York, vol. 7, p. 194. carbonarius, Meek & Worthen, 1870 ; Proc. Acad. Nat. Sci. Phila., vol. 22, p. 55. Coal Measures. carbonarius, id., 1873; Geol. Survey Illinois, vol. 5, p. 618, pi. 32, fig. 1. carbonarius, White, 1884; 13th Rept. Dept. Geol. Nat. Hist. Indiana, p. 178, pi. 39, fig. 2. Neptuni, Hall; see Mesothyra Neptuni. Dolichopterus (subgenus Euj-ypterus), Hall, 1859 ; Pal. New York, vol. 3, p. 414*. inacrocheirus. Hall
. Annals of the New York Academy of Sciences. Science; Science -- New York (State). 16 North American Palaeozoic Crustacea. Belli, Hall & Clarke, 1888; Pal. New York, vol. 7, p. 194. carbonarius, Meek & Worthen, 1870 ; Proc. Acad. Nat. Sci. Phila., vol. 22, p. 55. Coal Measures. carbonarius, id., 1873; Geol. Survey Illinois, vol. 5, p. 618, pi. 32, fig. 1. carbonarius, White, 1884; 13th Rept. Dept. Geol. Nat. Hist. Indiana, p. 178, pi. 39, fig. 2. Neptuni, Hall; see Mesothyra Neptuni. Dolichopterus (subgenus Euj-ypterus), Hall, 1859 ; Pal. New York, vol. 3, p. 414*. inacrocheirus. Hall, 1859 ; Pal. New York, vol. 3, p. 414*, pi. 83, fig. 1 ; pi. 83 a, fig. 1. Waterlime. Dolichocephala, Claypole, 1883 ; Proc. Am. Philos. Soc, vol. 21, p. 236. Lacoana, id., p. 236, plate. Catskill. Referred to Sti/lomij-us excelsior, Echinocaris, Whitfield, 1880; Am. Jour. Sci., 3d series, vol. 19, p. 34. Diagnosis.—Carapace bivalviilar, eauli valve oblique by subovate in outline ; hinge-line straight and shorter than the greatest length of the shield. Anterior extremities slightly gaping, posterior extremities somewhat pro- duced, incurved, or truncate. Rostrum ab- sent or not observed. The cephalic and anterior portion of the thoracic area marked by various regularly and symmetrically ar- ranged nodes, two of which bear the optic spots. Nuchal furrow more or less distinct. The thoracic portion of each valve bears one or two longitudinal, somewhat curving lateral ridges or carinae. Abdomen naked, composed, so far as known, of 6 somites, which are furnished with short spinules or prickles on their dorsal surface. Caudal plate short and produced into a stout telson. Lateral spines or cercopods narrow and longer than the telson. (Hall & Clarke, Pal. New York, vol. 7, p. liv.) condylepis, Hall & Clarke, 1888-, Pal. New York, vol. 7, p. 173, pi. 29, figs. 14-17. Chemung, multinodosa, Whitfield, 1880; Am. Jour. Sci., 3d series, vol. 19, p. 38, pi. o, fig. 8 (plate only wi
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