82 
LIST OF TYPES AND FIGUKED 
Orthocera glgantea, J. Sowerby, Miu. Conch, vol. hi, p. 81, 1819, 
pi. ccxlvi, ff. 3 & 5 (reversed). Carboniferous (Calciferous Sand- 
stone) : Closeburn, Dumfriesshire. [43835 c.] 
Orthocera gigantea, J. Sowerby, Min. Conch, vol. hi, p. 81, 1819, 
pi. ccxlvi, f. 4 (reversed). Carboniferous (Calciferous Sandstone) : 
Closeburn, Dumfriesshire. [43835 cl.'] 
Orthocera paradoxica, J. de C. Sowerby, Min. Conch, vol. v, p. 81, 
1824, pi. cccclvh. Carboniferous Limestone : Ireland. [43842.] 
Orthocera politum, A. v. Klipstein, Beitr. zur geol. Kenntn. ostlichen 
Alpen, 1843, p. 144, pi. x, f. 6 . Orthoce^'as politum, A. v. Klipstein : 
(apex of), A. Hyatt, ‘ Genesis of the Arietidae ’ (Smithsonian 
Contrib. to Knowledge), 1889, p. 10, ff. 6-8. Id. : (apex of), J. 
Barrande, Syst. Sil. de Boheme, vol. ii, texte v, p. 1325 ; vol. ii, Suppl. 
1877, pi. 488, case xi, ff. 1, 2, &3. Trias : St. Cassian. [36040 a.] 
Orthocera steinhaueri, J. Sowerby, Min. Conch, vol. i, p. 132, 1814, 
pi. lx, f. 4. Coal-Measures: north of Halifax, Yorkshire. [43841.] 
Orthocera striata, J. Sowerby, Min. Conch, vol. i, p. 129, 1814, pi. Iviii. 
Carboniferous Limestone : Mack-rock, near Cork, Ireland. [43836.] 
Orthocera undulata, J. Sowerby, Min. Conch, vol. i, p. 130, 1814, 
pi. lix, ff. 1, 2 (reversed). Carboniferous Limestone : Scaleber, near 
Settle, Yorkshire. [43838.] 
Orthocera sp., J. J. Bigsby, Trans. Geol. Soc. [2], vol. i, pt. 2, 1824, 
p. 204, pi. XXX, f. 1. Ormoceras hackii, C. Stokes, Trans. Geol. Soc. 
[2], vol. V, 1840, p. 709, with a reference to Bigsby’s figure. Silurian 
(Niagara Group) : Drummond Island, Lake Huron. [33429.] 
Orthocera sp., J. J. Bigsby, Trans. Geol. Soc. [2], vol. i, pt. 2, 1829, 
p. 198, pi. XXV, f. 1. Actinoceras bigsbyi, H. G. Bronn, Lethsea 
Geogn. vol. i, 1837, p. 98, pi. i, f. 8. Ordovician (Black Biver 
Formation) : Thessalon Island, Lake Huron. [33448.] 
Orthocera sp., J. J. Bigsby, Trans. Geol. Soc. [2], vol. i, pt. 2, 1824, 
p. 198, pi. XXV, f. 2. Actinoceras bigsbyi, H. G. Bronn, Lethaca 
Geogn. vol. i, 1837, p. 98. Ordovician (Black Biver Formation) ; 
Thessalon Island, Lake Huron. [C. 2664.] Part of infilling of 
siphuncular tube has been broken away since figured. 
