WENLOCK GROUP. 








ene Reference to McCoy’ 
Column of : : 8 Names and References; Observations, &c. Numbers and Localities. 
Drawers. Synopsis : and Figures of Genera. 
Gd8s O. filosum, p. 314. Orthoceras dulce, Barrande (Sil. Syst. Boh. Vol. | a. 628, Builth Bridge, large 
1. pl. 294, 295; pl. 357, figs. 8, 9). specimen. 
Gd8 p. 315. Orthoceras laqueatum, Hall? (Pal. New | a. 629, Dinas Bran, Llan- 
York, t. 56, fig. 1). I doubt this reference. | gollen. 
McCoy refers to O. subcostatum, Portlock, as 
a near ally. 
Gd8s Cycloceras, p. 320. Orthoceras subannulare, Miinst. (Beitrige, | b. 829, Builth Bridge, Wen- 
Heft 11. p. 99, pl. 19, fig. 3). See above in | lock Shale. 
Lower Wenlock, p. 98. 
Gds O. bullatum, p. 313. Orthoceras, sp. Much finer stria than Q. bul- | a. 685, Llyn Alwen, Den- 
latum, and more like O. tenuistriatum, per- | bighshire. 
haps identical. 
Gd8 p. 316. Orthoceras primevum, Forbes (Creseis, Forbes, | b. 833, Cwmbach Builth ; 
Quart. Journ. Geol. Soc. Vol. m. pl. 18, fig. 2). | a. 636, Builth Bridge. 
Long thin shells with very convex septa, 
easily crushed. 
Gd8& p. 318. Orthoceras ventricosum, Sharpe (Creseis, Quart. | b. 830, Builth Bridge (W. 
Journ. Geol. Soc. Vol. 1 pl. 13, fig. 3). A | Shale). 
shorter shape than O. primavum. 
Gd 10 Orthoceras, sp. New, large like O. filoswm, | a. 638, Dudley, F.C. 
| but with impressed lines instead of raised 
thread-like striz. It is probably related to 
O. dulce, Barr. 
FC Orthoceras distans, Sow.? (Siluria, 2nd ed. | a. 619, Dudley, F.C. 
pl. 26, fig. 4), has in this specimen fine 
longitudinal striz, not before observed. 
(It is imperfect, and may not be certainly 
Sowerby’s species. I think it is.) 
Gd 10 p. 318. Orthoceras angulatum, Wahl.? (Siluria, 2nd | a. 643, a. 645, a. 644 may 


ed. pl. 28, fig. 4). These specimens (if the 
same as the well-known casts in Ludlow 
rocks) shew the ribs much more raised and 
thread-like—we had only casts before. 
Phragmoceras, Brod. A laterally compressed 
and curved shell, aperture contracted in the 
middle, siphuncle ventral, radiated. 
be quite distinct, I think it 
is so. Dudley, F.C. 
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