230 
CONCHIFERA. 
Panop^a. 
Tribe IT.—SOLENIDES. 
Shell transversely elongated, destitute of accessory pieces? 
and gaping only at the lateral extremities ; ligament external. 
G enus LXVI.—SOLE MY A .—Lama rck. 
Shell equivalve, inequilateral, transversely oblong, rounded 
at the extremities; beaks near the posterior side; hinge desti¬ 
tute of teeth; ligament partly internal, situate in the margin 
of an oblique, flattish, posterior rib ; two distant lateral mus¬ 
cular impressions. 
1 . Solemya prtmjeva. —The Primeval Solemya, pi. XCIII. 
fig. 10. 
S. primatva . Phillips, Geo. York, II. p. 209, pi. 5, fig. G. 
Transversely oblong oval, compressed, rounded at both 
sides; beaks depressed ; surface with rather wide radiating 
strim. 
The Carboniferous Limestone, Heiton ; Lowick and Fer¬ 
managh, Ireland. 
Genus LXVII.—PANOP^EA.— Menard. 
Equivalve, oval, inequilateral, gaping unequally at both ex¬ 
tremities ; hinge with an acute erect primary tooth in each 
valve, and a large callosity near the umbones supporting the 
ligament; two distant, oval, muscular impressions, pallial im¬ 
pression with a large sinus ; ligament large, external, adhering 
to an ample prominent fulcrum. 
1. PanoptEA intermedia.—T he Intermediate Panopma, 
pi. XCIII. figs. 14, 15. 
Mya intermedia. Sowerby, VII. p. 4, pi. G02, lb. I. p. 
7fi, fisr. 1, and p. 173, pi. 419, fig. 2. Corbula dubia. Deshayes, 
Coq. Foss. p. 59, pi. 9, figs. 13, 14. 
Shell ovate, depressed, inequilateral, thin, longitudinally 
ribbed ; hinge with one cardinal tooth close to the pit of the 
hinge. 
The London Clay at Reading, Watford, Plumstead, and 
Bognor. 
2. Panop/EA gibbosa. —The Gibbous Panopa?a, pi. XCIII. 
fig. 13. 
Mactra gibbosa. Sowerby, I. p. 91, pi. 42. 
Gibbose, transversely elongated, its breadth twico its length, 
anterior side considerably wider than the posterior, recurved, 
truncated, and gaping; posterior side rounded; length and 
depth nearly equal; beaks greatly incurved, and pointed. 
The Portland Stone, Brill, Buckinghamshire; the Inferior 
Oolite, near Bath. 
3. Panopasa oblata. —Raised Panoptea, pi. XCIII. fig. 22. 
Mya gibbosa. Sowerby, V. p. 19, pi. 419, fig. 1. 
Sub-triangular, gibbose and gaping, posterior side short; 
anterior side somewhat attenuated, beaks prominent and in¬ 
curved ; surface with transverse regular furrows. 
The Kimmeridgo Clay, Osmington, Dorsetshire. 
4. Panopjea plicata. —Plicated Panoptea, pi. XCIV. f. 10. 
Mya plicata. Sowerby, V. p. 20, pi. 419, fig. 3. 
Transversely oblong, its width nearly twice its length ; al¬ 
most cylindrical, and ventricose; anterior side truncated and 
gaping ; posterior side very short, and a little narrowed, beaks 
rather obtuse ; surface with distinct concentric shallow ridges; 
which are straight towards the beaks. 
The Upper Greensand, Rowde Hill; the Gault, Folkstone ; 
the Lower Greensand, Sandgatc, Isle of Wight and Lyme 
Regis. 
5. Panoptea Norwegica. —The Norwegian Panopma, pi. 
XCIII. figs. 17, 18, 19. 
P. Norwegica, Sowerby, VII. p. 1, pi. G10, figs. 2 and 011, 
figs. 1, 2. 
P. hivonoe. Forbes, Mem. Wern. Soc. VIII. p. 94, pi. 
2, figs. 4, 4. 
Transversely oblong, compressed, thick ; anteriorly shortest 
and rounded; posteriorly obliquely truncated above and 
rounded below ; two longitudinal shallow furrows emanate 
from the beak, the one near the middle of the posterior side, 
and the other from the centre of the beaks, terminating on the 
margins, dividingtho valve into three parts; beaks placed on the 
anterior side ; back and basal lines parallel; surface with con¬ 
centric wrinkles ; muscular impressions deep, pallial impressions 
large and unconnected with a shallow sinus. 
The Pleistocene Marino Formation, the Clyde and Bute, 
and the Red Crag, Sutton. 
G. PanopvEa elongata.— The Elongated Panopa\a, pi. 
XCIII. fig. 1G. 
P. elongata. Portlock, Geo. Rep. p. 119, pi. 34, fig. 19. 
Much elongated transversely; beaks sub-central, obtuse, 
anterior side shortest; both extremities rounded, posteriorly a 
little dilated, an oblique ridge from the beak to the margin, 
cardinal margin straight; surface with concentric wrinkles. 
The Portland Oolite, Ballintoy, Ireland. 
7. Panop.ea rotundata. —The Rounded Panopma, pi. 
XCIII. figs. 11, 12. 
P. rotundata. Sowerby, Geo. Tr. 2d Ser. IV. p. 338, pi. 
13, fig. 2. 
Nearly orbicular ; considerably gibbose, beaks obtuse, cen¬ 
tral, and approximate, anterior side rounded; posterior side 
with a short, curved ridge from the beak to the margin, above 
which it is obliquely truncated, the termination of the beak 
forming an acute angle; basal lino much arcuated. 
The Lower Greensand, Sandgate. 
8. Panoptea ovalis. —The Oval Panopma, pi. XCIV. 
figs. G, 7. 
P, ovalis. Sowerby, Geo. Tr. 2d Ser. IV. p. 340, pi. 1G, f. 5. 
Transversely oval; moderately convex; beaks situate 
nearest the anterior side, which is closed; posterior sides 
rounded and gaping; surface smooth. 
The Greensand, Blackdown. 
9. Panopasa gentilis. —The Gentle Panopa}a. 
P. gentilis. Sowerby, VII. p. 1, pi. 510. 
Transversely elongated; oblong ovate; sides flattened; 
posteriorly acuminated; anteriorly rounded and expanded 
upwards; beaks nearly central and inflected ; gaping at both 
extremities; width nearly twice the length. 
In the Red Crag, Alderton. 
