North American Palaeozoic Crustacea. 19 



siliqua, Etheridge, Woodward & Jones, 1885 ; 3d Kept. Comm. Fossil 



Phyllopoda Pal. Rocks, p. 35. 

 siliqna. Hall & Clarke, 1888; Pal. New York, vol. 7, p. 182, pi. 31, 



figs. 5, 6. 

 siliqua, Etheridge, Woodward & Jones, 1888 ; 6th Rept. Comm. Fossil 

 Phyllopoda Pal. Rocks, p. 8. 

 Entomis, Jones, 1861 ; Mem. Geol. Survey Scotland, Expl. Map 32, p. 137: 

 also Annals & Mag. Nat. Hist., 4th series, London, vol. 11, p. 413. 

 Gen. Char- — Carapace convex, suboblong, ovate-oblong, or subrenifonu, 

 more or less constricted dorsally by a transverse furrow across the 

 hinge-line ; in front of the furrow there is sometimes a tubercle — 

 variable in position and shape ; surface either smooth or (most com- 

 monly) ornamented with raised lines or riblets, arranged in a definite 

 pattern — transverse, longitudinal, or concentric ; the anterior margin 

 is without sinus and notch. (Jones & Kirby, Proc. Geol. Assoc, vol. 9, 

 No. 7, p. 7.) 

 Cythere Cincinnatiensis, Meek, 1871; Proc. Acad. Nat. Sci. Phila., p. 331. 



Hudson River. 

 Cythere Cincinnatiensis, Meek, 1872 ; Pal. Ohio, vol. 1, p. 158, pi. 14, 



figs. 1 a-1 d. 

 Cythere Cincinnatiensis, Miller, 1874; Cincinnati Quart. Jour. Sci., vol. 1, 



p. 120. 

 Entomis Cincinnatiensis, Jones, 1884 ; Annals & Mag. Nat. Hist. 5th series, 



London, vol. 14, note, p. 395. 

 Equisetides Wrightiana. This species is referred by Woodward & Jones, 3d Rept. 

 Comm. Fossil Phyllopoda, Brit. Assoc, 1885, p. 360, to Echinocaris. 

 Prof. Hall placed it provisionally with Stylonurus, which see. 

 Estheria, Rufi'ell, 1857 ; Mus. Senckenberg, vol. 2, p. 119. 



Diagnosis. — Carapace bivalvular, the outline of each valve being sub- 

 circular, obliquely oval, or subquadrate. Beaks generally anterior, 

 sometimes subcentral. Dorsal or hinge-line straight, shorter than the 

 greatest length of the valves. Surface rarely smooth, usually with 

 concentric lines of growth, the interstitial spaces being often orna- 

 mented with a fine punctate or reticulate sculpture. Test very thiu. 

 (Hall & Clarke, Pal. New York, vol. 7, p. Ixi.) 

 Dawsoni, Jones, 1870; Geol. Mag., vol. 7, p. 220, pi. 9, fig. 15. 



Carboniferous. 

 Dawsoni, Jones, 1878; Geol. Mag. Dec. 2, vol. 2, p. 101, pi. 3, fig. 2. 

 Estheria sp.? Dawson, 1868 ; Acadian Geology, p. 256, fig. 78 d. 

 Dawsoni, Jones & Kirk by, 1884; Geol. Mag., Dec. 3, vol. 1, p. 361, pi. 12, 



fig. 12. 

 pulex, Clarke, 1882 ; Am. Jour. Sci., 3d series, vol. 23, p. 476, plate, fig. 4. 



Hamilton, 

 pulex, Packard, 1883; 12th Rept. U. S. Geol. Survey Territories, p. 355. 

 pulex, Etheridge, Woodward & Jones, 1887 ; 5th Rept. Comm. Foss. 

 Phyllopoda Pal. Rocks, p. 10. 



