552 



CRUSTACEA. 



[ISO. LEP. 



FIG. 1018.-Isochi- 

 lina joiiesi. 



armata, Walcott, 1883, 35th Rep. N. Y. St. 

 Mus. Nat. Hist., p. 213, Trenton Gr. 



cylindrica. Hall, 1852, 

 (Cytherinacylindrica,) 

 Pal. N. Y., vol. 2, p. 

 14, Medina Gr. 

 gracilis, Jones, 1858, 

 Can. Org. Rem. Dec- 

 ade 3, p. 98, Black 

 Riv. and Trenton Grs. 

 . jonesi, Wetherby, 1881, Jour. Cin. Soc. 



Nat. Hist., vol. 4, p. 80, Trenton Gr. 

 labrosa, Jones, 1889, Ann. and Mag. Nat. 

 Hist., 6th ser., vol. 3, p. 383, Low. 

 Held. Gr. 



Ottawa, Jones, 1858, Can. Org. Rem., Dec- 

 ade 3, p. 97, Black Riv. Gr. 

 Isotelus,, DeKay, 1825. Annals Lyceum Nat. 

 Hist. N. Y., vol.'l, p. 174. [Ety. tsos, 

 equal ; telos, end.] A subgenus of 

 Asaphus. 



canalis, see Asaphus canalis. 

 gigas, see Asaphus gigas. 

 maximus, see Asaphus megistus. 

 megistus, see Asaphus megistus. 

 vigilans, see Asaphus vigilans. 

 LBAIA, Jones, 1862, App. to Mon. Foss. 

 Estheria., p. 116. [Ety. proper name.] 

 Carapace bivalve; subquadrate , thin, 

 horny, truncated and slightly curved 

 behind, rounded in front, straight on 

 the dorsal edge ; surface concentrically 

 ridged and finely reticulated in the 

 furrows; each valve crossed by one, 

 two, or three ridges; the first and 

 most conspicuous crosses from the an- 

 terior part of the umbo to the antero- 

 yentral angle; the second, when it ex- 

 ists, reaches the postero-ventral angle, 

 and the third lies along the dorsal 

 margin. Type L. leidyi. 

 leidyi, Lea, 1856, (Cypricardia leidyi,) 

 Proc. Acad. Nat. Sci., vol. 7, p. 341, 

 Coal Meas. 



FiG.f 1019. Leaia'tricarinata. B 1, right valve : 

 B 2, enlarged ; B$, dorsal view; c, left valve. 



tricarinata, Meek & Worthen, 1868, Geo. 



Sur. 111., vol. 3, p. 541, Coal Meas. 

 LEPERDITIA, Rouault, 1851, Bull. Soc. Geo. 

 France, 2d eer., t. 8, p. 377. [Ety. lepis, 

 scale ; dittos, double.] Carapace bivalve, 



inequivalve, right valve larger than the 

 left, and overlapping the ventral border, 

 and to some extent the anterior and 

 posterior borders of the left valve ; valves 

 smooth, convex, horny, oblong, longer 

 than broad, bean-shaped, inequilateral, 

 posterior half the broader ; dorsal 

 border straight; ventral border semi- 

 circular. Type L. brittanica. 



alta, Conrad, 1843, (Cytherina alta,) Geo. 

 Rep. 3d Dist. N. Y., p. 112, and Pal. 

 N. Y., vol. 3, p. 373, Low. Held. Gr. 



amygdalina, Jones, 1858, Can. Org. Rem., 

 Decade 3, p. 97, Chazy Gr. 



angulifera, Whitfield, 1882, Ann. N. Y. 

 Acad. Sci., vol. 2, p. 197, Low. 

 Held. Gr. 



anna, Jones, 1858, Can. Org. Rem., Dec- 

 ade 3, p. 96, Hud. Riv. Gr. 



anticostiana, Jones, 1858, (L. canadensis 

 var. anticostiana,) Can. Org. Rem., Dec- 

 ade 3, p. 95, Hud. Riv. Gr. 



arctica, Jones, 1856, Ann. and Mag. Nat. 

 Hist., 2d ser., vol. 17, p. 87, Up. Sil. 



argenta, Walcott, 1886, Bull. U. S. Geo. 

 Sur., No. 30, p. 146, Up. Taconic. 



billingsi, Jones, 1881, Ann. and Mag. Nat. 

 Hist., 5th ser., vol. 18, Trenton Gr. 



bivertex, Ulrich, 1879, Jour. Cin. Soc. 

 Nat. Hist., vol. 2, p. 11, Utica Slate Gr. 

 bivia, White, 1874, Rep. 

 Invert. Foes., p. 11, and 

 Geo. Sur. W. 100th 

 Mer., vol. 4, p. 58, Que- 

 bec Gr. 

 byrnesi, S. A. Miller, 



" ia &- 1874, Cin. Quar. Jour. 



Sci., vol. 1, p. 123, Utica Slate Gr. 



ceecigena, S. A. Miller, 1881, Jour. Cin. 

 Soc. Nat. Hist., vol. 4, p. 262, Hud. 

 Riv. Gr. 



canadensis, Jones, 1858, ,--. 



Ann. Nat. Hist., 3d ser., ^ 



vol. 1, p. 244, Chazy to 

 Trenton Gr. 



capax, Safford. Not defined. 



carbonaria, Hall, 1858, (Cy- 

 there carbonaria,) Trans. 

 Alb. Inst., vol. 4, p. 33, 

 and Bull. Am. Mus. Nat. FIG. 1021. Le- 

 Hist., p. 94, Warsaw Gr. perduia cse- 



cayuga Hall 1862, 15th S^e'and' 

 Rep. N. Y. St. Mus. Nat. magnified. 

 Hist., p. 83, Cornif. Gr. 



concinnula, Billings, 1865, Pal. Foss., vol. 

 1, p. 299, Quebec Gr. or Up. Taconic. 



crepiformis, Ulrich, 1879, Jour. Cin. Soc. 

 Nat. Hist, vol. 2, p. 10, Hud. Riv. Gr. 



cylindrica, Hall, 1871, 24th Rep. N. Y. 

 St. Mus. Nat. Hist., p. 231, Utica Slate 

 and Hud. Riv. Grs. 



dermatoides, Walcott, 1887, Am. Jour. 

 Sci. and Arts, 3d ser., vol. 34, p. 192, 

 Up. Taconic. 



ebinina, Dwight, 1889, Am. Jour. Sci. 

 and Arts, 3d ser., vol. 38, p. 144, Up. 

 Taconic. 



faba, Hall, 1876, 28th Rep. N. Y. St. Mus. 

 Nat. Hist., p. 186, Niagara Gr. 



<> 



FIG. 1020.-Leper- 

 clitia byrnesi. 



