160 
a 
Case and 
Column of 
Drawers. 
Reference to McCoy’s 
Synopsis: and Figures of Genera. 

FC 
FC 
FC 
FC 
Gd10 
Gas 
FC 
Gd8s 
Gd10 

p. 322. 
Poterioceras, p. 321. 
P. ellipticum, p. 321. 



Hortolus, p. 324. 



SILURIAN. 

Names and References; Observations, &c. 
Numbers and Localities. 

Phragmoceras ventricosum, Sow. (Siluria, 2nd 
ed. pl. 32). 
Phragmoceras ventricosum, var. dwarf with 
close septa. A little like P. arcwatwm, Sow. 
Phragmoceras (Gomphoceras) pyriforme, Sow. 
(Siluria, 2nd ed. pl. 30, figs. 1—8). 
Phragmoceras (Gomphoceras) zquale, Salter. 
Lituites, Breyn. [The genus Litwites differs 
from Trochoceras in being discoid and not 
spiral, and from Hortolus by the whorls of 
the spire being in contact. ] 
Cyrtoceras Biddulphii, Sow. (Lrtuites, Siluria, 
2nd ed. pl. 31, figs. 1, 2). 
[Cyrtoceras? compressum, Sow. (Phragmo- 
ceras, Siluria, 2nd ed. pl. 31, fig. 4.)] 
Cyrtoceras corniculum, Barrande (Sil. Syst. 
Bohem. Vol. 11. p. 492, pl. 121); perhaps a 
Phragmoceras, section round. 
Trochoceras (Barr.), formerly known as Lituites, 
but found to be spiral, not discoid shells. 
Trochoceras spurium, Salter, n. sp. Much 
narrower whorls than Phragm. nautileum. 
Trochoceras, sp. Narrow whorls, very faint ribs. 
Trochoceras giganteum, Sow. (Lituztes, Siluria, 
2nd ed. pl. 36, figs. 1—3). Very common, 
but seldom perfect. The species vary as 
Ammonites and Nautili do, and Trochoceras 
represents, among the Nautilide, Helicoce- 
ras, D’Orb., among the Ammonitide., 


a. 616, Dudley, F.C. 
a. 617, Dudley, F. C. 
a. 622, Dudley, F.C. 
a. 623, Dudley, F.C.; b. 
835, Tortworth(Earl Ducie); 
b. 834, Dudley, F. C. 
Halfway House, on the 
road from Llandovery to 
Trecastle. 
a. 637, Dudley, F.C. 
a. 914, Dudley. | 
a. 466, Wenlock Shale 
of Builth Bridge. 
a. 913, Dudley, F.C. 
a. 952, Ledbury; a. 641, 
a, 642, Dudley, F. C. 
