168 
OnTHis MiCHELiNi, LeveilU.' 
PI. X, Pig. 10. 
Anomi(e striatw, D. Ure, 1793, Hist. Entlierglen, p. 316, pi. 14, fig. 13, 14. 
Terehratnla Miclielini, Leveille, 1835, Mem. Soc. Geol. Prance, II, p. 30, pi. 2, fig. 14-17. 
SpivifeTCl jlliavia, J. Phillips, 1836, Geol. Torhshire, II, pi. 11, fig. 3. 
Ovtllis 3£ic1l6lini, L. G. de Koniuck, 1843, Descr. Anim. Poss. Terr. Carb. Belg., p. 
55 
55 
55 
55 
55 
55 
55 
55 
55 
55 
jiliaria, 
cUvaricata, 
circularis, 
jiliaria, 
Michelini, 
35 
35 
Ilichelini, var. 
55 
55 
228, pi. 13, fig. 8, 10c, lOd. 
Portlock, 1843, Eej)t. Geol. Londonderry, p. 458. 
McCoy, 1844, Synop. Carb. Poss. Ireland, p. 123, pi. 20, fig. 17. 
Idem, 1844, ihicL, p. 122, pi. 20, fig. 19. 
Idem. 1844, ihid., p. 123. 
E. de Verneuil, 1845, in Murchison, de Verneuil and de Keyserling, 
Russia and the Ural Mts., II, p. 185, pi. 12, fig. 7. 
P. V. Semenow, 1854, Poss. Brach. Schles. Kohlenkalkes, p. 26, pi. 
3, fig. 11 (Zeits. Deutsch. Geol. GeselL, VI, p. 342). 
McCoy, 1854, Brit. Pal. Poss., p. 448. 
iBurlingtouensis, J. Hall, 1858, Eept. Geol. Survey Iowa, I, 
p. 596, pi. 12, fig. 4. 
M. V. Griinewaldt, 1860, Mem. Acad. Imp. St. Petersbourg, II (7), 
p. 108. 
T. Davidson, 1860, Mon. Carb. Brach. Scotland, p. 30, pi. 1, fig. 
7-10. 
,, Idem, 1861, Mon. Brit. Carb. Brach., p. 133, pi. 30, fig. 6-12. 
,, J. Gray, 1865, Biograph. Notice of D. Ure, p. 51. 
Fenniana', O. A. Derby, 1874, Bull. Cornell Univ. (Sci.), 1, No. 2, p. 26, pi. 5, 
fig. 13, 15, 17, 19-22, and pi. 8, fig. 2. 
This shell is generally snh-circiilar. sometimes slightly elongated and 
sul)-triangular ; its greatest transverse diameter is found at a short distanee 
from tlie frontal margin, which a median depression of the valves often renders 
slightly sinnons. The ventral valve is usually flatter and shallower than the 
dorsal valve ; its beak is small, pointed, slightly recurved, and scarcely pro- 
jeets over that of the opposite valve ; its hinge area is small, triangular, and 
' [It is jji’obable that the fossils referred to this species are Ortliis australis, McCoy. Compare R. 
Etheridge, Jxmr., Geol. and Pal. Q’land., 1892, p. 245, t. 11, f. 27. 29.— W.S.D.] 
