EAT. — EIC.] 



BRACHIOPODA. 



345 



neglecta, Hall, 1863, 16th Rep. N. Y. St. 



Mus. Nat. Hist., p. 29, Chemung Gr. 

 newberryi, Hall, 1863, 16th Rep. N. Y. St. 



Mus. Nat. Hist., p. 30, Waverly Gr. 

 nitida, Phillips, 1836, (Orbicula nitida,) 



Geo. of York., vol. 2, p. 221, and Geo. 



Sur. 111., vol. 5, p. 572, Coal Meas. 

 patellaris, Winchell, 1863, Proc. Acad. Nat. 



Sci., p. 4, Waverly or Marshall Gr. 

 pelopea, Billings, 1862, Pal. Foss., vol. 1, 



p. 52, Trenton Gr. 

 pleurites, Meek, 1875, Ohio Pal., vol. 2, p 



278, Waverly Gr. 

 randalli, Hall, 1863, 16th Rep. N. Y. St 



Mus. Nat, Hist., p. 25, Ham. Gr. 

 saffordi, Winchell, 1869, Geo. of Tenn. 



and, in 1870, Proc. Am. Phil. Soc, p 



248, Marshall Gr. 

 seneca, Hall, 1863, 16th Rep. N. Y. St 



Mus. Nat. Hist, p. 26, Ham. Gr. 

 snhlamellosa, Ulrich, 1878, Jour. Cin. Soc 



Nat. Hist., p. 97. Probably the cast of 



a Trematis. 

 xubtrigonalis, McChesney, 1865, Desc. New 



Pal. Foss , Coal Meas. Not recognized, 

 tenuilamellata, Hall, 1852, (Orbicula ten- 



uilamellata,) Pal. N. Y., vol. 2, p. 250, 



Niagara Gr. 

 tenuilamellata var. subplana, Hall, 1860, 



Can. Nat. and Geol., vol. 5, p. 144,Up. Sil. 

 tenuilineata, Meek & Hayden, 1859, Proc. 



Acad. Nat. Sci., p. 25, Coal Meas. 

 tenuistriata, Ulrich, 1878, Jour. Cin. Soc. 



Nat. Hist., p. 96. Probably the cast of 



a Trematis. 

 trigonalis, syn. for D. subtrigonalis. 

 truncata, see Schizobolus truncatus. 

 tullia, Hall, 1863, 16th Rep. N. Y. St. Mus. 



Nat. Hist., p. 28, Tully limestone, 

 vanuxemi, Hall, 1859, Pal. N. Y., vol. 3, 



p. 162, Water-lime or Low. Held. Gr. 

 varsoviensis, Worthen, 1884, Bull. No. 2, 



111. St. Mus. Nat. Hist., p. 23, and Geo. 



Sur. 111., vol. 8, p. 102, Keokuk Gr. 

 Eatonia, Hall, 1857, 10th Rep. N. Y. St. 



Mus. Nat. Hist., p. 90, and 12th Rep., 



p. 35. [Ety. proper name.] Oval, ovoid, 



subcircular, elongate, or transverse ; 



valves very unequally convex ; mesial 



fold and sinus; beak of ventral valve 



small, perforate, closely incurved over 



the umbo of the dorsal valve ; two 



teeth in the ventral, with corresponding 



sockets in the dorsal valve ; a prominent 



bifurcating cardinal process and four 



crural processes in the dorsal valve dis- 

 tinguish this genus. Type E. medialis. 

 eminens, Hall, 1857, N. Y. St. Mus. Nat. 



Hist., p. 92, and Pal. N. Y., vol. 3, p. 242, 

 Low. Held. Gr. 

 medialis, Vanux- 

 em,1842,(Atrypa 

 mediaalis,) Geo. 

 Rep.3d Dist. N. 

 Y.,p.l21,andPal. 

 N.Y.,vol.3,p.241, 

 Low. Held. Gr. 

 peculiaris, Conrad, 1841, (Atrypa pe- 



culiaris,) Ann. Rep. N. Y., p. 56, and 



Fig. 562.— Eatonia medi 

 alis. Anterior view. 



singularis. 

 vol. 3, Oriskany 



Pal. N. Y., vol. 3, p. 244, Oriskany and 

 Low. Held. Gr. 

 pumila, Hall, 1859, Pal. N. Y., vol. 3, p. 



437, Oriskany sandstone, 

 singularis, Vanuxem, 1842, (Atrypa sin- 

 gularis,) Geo. Rep. 

 3d Dist. N. Y., p. 

 120, and Pal. N. Y., 

 vol. 3, p. 243, Low. 

 Held. Gr. 

 sinuata Hall, 1857, fig. 563.-Eatonia 

 10th Rep. N. Y. St. 

 Mus. Nat. Hist., p. 

 91, and Pal. N. Y. 

 sandstone. 



whitfieldi, Hall, 1859, Pal. N. Y., vol. 3, 

 p. 437, Oriskany sandstone. 

 Eichwa*,dia, Billings, 1858, Rep. of Progr. 

 Geo. Sur. Can., p. 190. [Ety. proper 

 name.] Ovate or subtrigonal, with or 

 without mesial fold and sinus ; ventral 

 valve obscurely perforate on the umbo; 

 apex acute and entire; space beneath 

 occupied by an imperforate concave 

 plate ; interior of the rostral cavity 

 containing a transverse septum ; dorsal 

 valve with a slender cardinal process 

 and a very elevated medio-longitudinal 

 septum ; valves articulated in a narrow 

 groove in the dorsal valve ; surface of 

 the shell reticulate, solid, and fibrous 

 beneath. Type E. subtrigonalis. 

 anticostiensis, Billings, 1866, Catal. Sil. 

 Foss. Antic, p. 10, Hud. Riv. Gr. 



concinna, Hall, 



1868. 20th Rep. 



N. Y. St. Mus. 



Nat. Hist., p. 319, 



Niagara Gr. 

 coral lifera, Hall, 



1852,' (Atrypa 



corallifera,) Pal. 



N. Y., vol. 2, p. 



281, Niagara Gr. 



Prof. Davidson 

 regarded this shell as identical with E. 

 capewelli, which was described in 1848, 

 in Bull. Soc. Geol. France, vol. 3. 

 g i b b o sa, 

 Hall, 1868, 

 20tb Rep. 

 N. Y. St. 

 Mus. Nat. 

 Hist., p. 

 319, Niag- 

 ara Gr. 

 r eticulata, 

 Hall, 1863, 

 (Rh v n- 

 chonella(?) 

 reticula- 

 ta,) Trans. 



A IK Tr»of 



i ' a '' Fig. 565.— Echwaldla subtrigo- 

 ***" ** "• nails. Dorsal, ventral, side, 

 217, Niag- front, and apex views. 

 a r a Gr. 



Davidson said a syn. for E. capewelli. 



subtrigonalis, Billings, 1858, Rep. of Progr. 



Geo. Sur. Can., p. 192, Black Riv. Gr. 



Fig. 564.— Eichwaldia 

 reticulata. 



