
WENLOCK GROUP. 
139 

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




oes, Reference to McCoy’s 
Drawers. Synopsis: and Figures of Genera, 
Gdl Spondylobolus craniolaris, 
Gd3 p. 255. 
Pl. 1 &, figs. 4, 5. 
Gda3 
Gd3 Athyris, p. 196. 
FC 
Gdl Hemithyris, p. 201. 
Gda3 
Gd3 
Gd3 
Gc8 
FC 


Athyris obovata, Sow. sp. (Siluria, 2nd ed. pl. 
22, fig. 16, Dav. Sil. Brach. p. 121, +. 12, 
fig. 19, t. 18, fig. 5). 
Meristella Circe, Barr. (Davidson, Sil. Brach. 
p- 116, t. 10, figs. 833—35). Differs chiefly 
from Merista, its ally in Bohemia, by the 
attachment of the muscles to the ventral 
valve. In this they are attached directly 
to the shell. In the Bohemian form they 
are first attached to an arched shelly pro- 
cess, and this to the rest of the shell. 
Meristella tumida, Dalman, sp. (Davidson, 
Sil. Brach. p. 109, t. 11, figs. 1—13, A thyris, 
Siluria, 2nd ed. pl. 22, fig. 20). Equally 
common in Sweden. 
Meristella didyma, Dalm. (Davids. l.c. t. 12, 
figs. 1—10, Siluria, 2nd ed. pl. 22, fig. 15). 
More common in the Aymestry Limestone. 
Meristella leviuscula, Sow. (Zerebratula, Sil. 
Syst. pl. 13, fig. 14, Siluria, 2nd ed. pl. 22, 
fig. 14, WZ. nitida, Davidson, Sil. Brach. t. 10, 
figs. 28332). A small edition of the last. 
Eichwaldia Capewellii, Davidson (Sil. Brach. 
p. 193, t. 25, figs. 12—15, Rhynchonella, 
Salter, Siluria, 2nd ed. Foss. 57, fig. 4. 
Porambonites, Siluria, 3rd ed. p. 226). A 
curiously netted surface on the shell. 
Retzia. A shell like Rhynchonella, but having 
the internal arm-supports wholly calcified. 
The shell is largely punctate. 
Retzia Barrandii, Davidson (Sil. Brach. p. 128, 
t. 13, figs. 1O—13, Siluria, 2nd ed. Foss. 57, 
fig. 5). 
Retzia Salteri, Davidson (1. c. t. 12, figs. 21, 22, 
Siluria, 2nd ed. Foss. 57, fig. 7, p. 250). 
Easily distinguished by the centre ribs 
being much smaller. 


a. 382, Builth Bridge (W. 
Shale, not Bala, J.W.S.); a. 
796, interior dorsal valve; 
a. 797, ventral valve; a. 
798, good, Dudley, F.C. 
a. 660, Dudley, Wenlock 
Limestone, F. C. 
a. 799, good interiors; a. 
661, young; a. 727 (David- 
son’s figure, L. Geol. Journ. 
fig. 12) shews spires; a. 
728, a. 729, a.730, Dudley, 
F.C. 
a. 800, a.801, Dudley, F.C.; 
a, 781*, Ledbury; a. 781, 
Tortworth (Karl Ducie). 
a. 649, a. 650, Dudley, 
HC: 
a. 648, Dudley, F.C. 
b. 745, Dudley, F.C. 
a. 771, ordinary form; a. 
772, fewer ribs; a. 773 
approaches R. Baylet, Dud- 
ley, F.C. 
18—2 
