WENLOCK GROUP. 
151 








ead is Reference Ho McCoy's 
Drawers. | Synopsis: and Figures of Genera. 
. 264 
FC 
sol 
Gaz se 
XS Y 
y 
(Anodontopsis securiformis), 
p. 272. 
IPL ag, wea) 
FC 
Leptodomus, p. 278. 
am 
la T<X<~ 
FC 
FC. 
FC 



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


Ambonychia striata, Sow. (Cardiola, Siluria, 
2nd ed. pl. 23, fig. 13). 
_ Lunulacardium, Miinster. A convenient genus, 
in which are placed a number of thin trian- 
gular bivalves with a truncated posterior 
side, divided by a strong keel from all the 
rest of the shell. Radiating striz cover the 
shell. 
Pseudaxinus, Salter. A generic term, intended 
to include those very thin and edentulous 
shells which have the shape of Aainus. A 
single species of it only is known in Wen- 
lock and Ludlow rocks; but it occurs 
throughout Lower Paleozoic, and my type 
was described from Arenig rocks. No speci- 
men in the collection. 
Pleurorhynchus xquicostatus, Phill. (Siluria, 
2nd ed. Foss. 59, fig. 1, Phill. Mem. Geol. 
Surv. Vol. 1. Pt. 1, pl. 16). A small species 
—the American rocks hold much larger 
species. 
Orthonotus amygdalinus, Sow. sp. (Siluria, 2nd 
ed. pl. 23, fig. 6). 
Orthonotus impressus, Sow. sp. (Siluria, 2nd ed. 
pl. 28, fig. 3). 
Goniophora grandis, Salter. Strongly costated, 
and marked with lines of growth which de- 
cussate the ribs. Twice the size of the com- 
mon Ludlow species. 
Grammysia cingulata, Hisinger (Siluria, 2nd 
ed. Foss. 60, fig. 1). The genus is Silurian 
and Lower Devonian, allied to Orthonotus. 

a, 840, Dudley, F.C. 
b. 725, Builth Bridge, Wen- 
lock Shale. 
a, 829, Dudley, F. C. 
Dudley. 
a. 828, Dudley, F. C. 
a, 827, Dudley, F.C. 
a. 836, left valve; a. 837, 
right valve; a, 838, young, 
Dudley, F.C. 
