. Annals of the New York Academy of Sciences. Science; Science -- New York (State). North American Palaeozoic Crustacea. 15 penn£e-dsdali, Etheridge, Woodward & Jones, 1884; 2d Kept. Comm. Fossil Phyllopoda Pal. Rocks, p. 11. peniiJB-dffidali, id., 1885 ; 3d Rept. Comm. Fossil Phyllopoda Pal. Rocks, p. 3. penuffi-dffidali. Hall & Clarke, 1888 ; Pal. New York, vol. 7, p. 200, pi. 35, fig. 24. peniije-dffidali, Etlieridge, Woodward, & Jones, 1888; 6th Rept. Comm. Fossil Phyllopoda Pal. Rocks, p. 9. pes-cervse, Clarke, 1883 ; Am. Jour. Sci., 3d series, vol. 25, 123, figs. 4, 5. Chemun
. Annals of the New York Academy of Sciences. Science; Science -- New York (State). North American Palaeozoic Crustacea. 15 penn£e-dsdali, Etheridge, Woodward & Jones, 1884; 2d Kept. Comm. Fossil Phyllopoda Pal. Rocks, p. 11. peniiJB-dffidali, id., 1885 ; 3d Rept. Comm. Fossil Phyllopoda Pal. Rocks, p. 3. penuffi-dffidali. Hall & Clarke, 1888 ; Pal. New York, vol. 7, p. 200, pi. 35, fig. 24. peniije-dffidali, Etlieridge, Woodward, & Jones, 1888; 6th Rept. Comm. Fossil Phyllopoda Pal. Rocks, p. 9. pes-cervse, Clarke, 1883 ; Am. Jour. Sci., 3d series, vol. 25, 123, figs. 4, 5. Chemung. pes-cervje, Jones & Woodward, 1884; Geol. Mag., Dec. 3, vol. 1, p. 349. pes-cervffi, Etheridge, Woodward, & Jones, 1884; 2d Rept. Comm. Fossil Phyllopoda Pal. Rocks, p. 11. pes-cervse, id., 1885 ; 3d Rept. Comm. Fossil Phyllopoda Pal. Rocks, p. 3. pes-cervje, Hall & Clarke, 1888; Pal. New York, vol. 7, p. 202, pi. 35, figs. 20, 21. pes-cervje, Etheridge, Woodward, & Jones, 1888; 6th Rept. Comm. Fossil Phyllopoda Pal. Rocks, p. 9. procne, Clarke, 1883 ; Am. Jour. Sci., 3d series, vol. 25, p. 122, figs. 2, 3. Chemuug. procne, Jones & Woodward, 1884; Geol. Mag., Dec. 3, vol. 1, p. 349. procne, Etheridge, Woodward & Jones, 1884; 2d Rept. Comm. Fossil Phyllopoda Pal. Rocks, p. 11. procne, id., 1885 ; 3d Rept. Comm. Fossil Phyllopoda Pal. Rocks, p. 3. procne, Hall & Clarke, 1888 ; Pal. New York, vol. 7, p. 201, pi. 35, figs. 25-27. procne, Etheridge, Woodward, & Jones, 1888; 6th Rept. Comm. Fossil Phyllo- poda Pal. Rocks, p. 9. Dithyrocaris (Scouler, 1843, MSS.), Port- lock; Rept. Geol. Londonderry, p. 313. Diagnosis.—Carapace subquadrate in out- line, bivalvular, the valves being con- ' nected by a simple, straight hinge-line, and gaping at the anterior extremity forming the rostral cleft. Rostrum un- known, each valve bearing a single gently curved carina. Optic node gener- ally conspicuous. Abdomen composed of ? segments of which one is naked.
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