PilOLADO.YlYA. 
CONCHIFE11A. 
231 
10. Panop,®a Ipsviciensis. —The Ipswich Panopasa. 
P. Ipsviciensis. Sowerby, VII. p. 3, pi. 11, figs. 3, 4. 
Transversely elongated, sub-cylindrical ; somewhat com¬ 
pressed ; thin ; posterior side truncated, and rounded ante¬ 
riorly, with a slight protrusion of the edgo; beaks central; 
surface slightly wrinkled concentrically; basal line nearly 
straight. 
In the Coralline Crag, Ramahot, and at Ipswich. 
Genus LXVIII.—SOLEN.— Linnaeus. 
Shell equivalve, transversely elongated; sub-cylindrical, pro¬ 
digiously inequilateral, umbones nearly terminal, situate close 
to the anterior side, and gaping widely at both extremities ; 
truncated or sub-truncated, sometimes rounded ; hinge linear, 
with several small cardinal teeth, various in form, ofteu acute 
and recurved; lateral teeth somewhat elongated and crooked ; 
muscular impressions distant, tongue-shaped, the anterior one 
joined a little behind the umbones ; the posterior one irregular 
and sub-oval ; pallia! impression elongated, straight, ami 
bifurcated behind ; ligament long and exterior ; external sur¬ 
face covered with a thick horny epidermis. 
1. Solen siliqua. —The Pod Solen, pi. XCIV. fig. 14. 
S. siliqua . Brown, Ill. Rec. Conch. Brit. p. 112, pL 46, 
%• i- 
Very much elongatod transversely, straight, sub-cylindrical; 
greatly inequilateral; hinge situate at one side, with a single 
thin, compressed, upright tooth in one valve, and an elongated, 
remote, lateral laminae ; the opposite valve with two teeth, a 
primary and a lateral one, corresponding to the lateral lam hue 
opposite; lower area striated transversely, with distant 
lines of growth, both of which suddenly cross the area longi¬ 
tudinally ; surface smooth. 
The Pleistocene Marine Formation, Clyde, and the Mammi- 
ferous Crag, Bramerton. 
2. Solen Parisiensis. —The Parisian Solen, pi. XCIV. f. 9. 
Solen strigillatus. Lamarck, An. du Mus. VII. p. 428, pi. 
43, fig. 5. Deshayes, Coq. Foss. p. 26, pi. 2, figs. 22, 23. 
Shell transversely oblong ovate, with the medial subsinus 
somewhat rugose ; surface, towards the centre of the valves, 
with obliquely longitudinal imbricated striae; hinge with a 
single tooth in one valve and two in the opposite one. 
Found in the London Clay, Bracklesham and Barton. 
3. Solen* vaginalis. —The Vagina-like Solen, pi. XCIV. 
fig. 18. 
/$. vaginalis. Deshayes, Elem. Conch, p. 108, pi. 6, fig. 
7. Coq. Foss. p. 25, pi. 2, figs. 20, 21. 
Shell linear, straight, the termination of the margin oblique ; 
hinge with one triangular tooth. 
Found in the London Clay at Barton. 
4. Solen Ensis. —The Sabre Solen, pi. XCIV. fig. 17. 
5. Ensis. Brown, Ill. Rec. Conch. Brit. p. 113, pi. 47, figs. 
10 , 10 . 
Greatly lengthened transversely; considerably arcuated 
aud truncated at both extremities; hinge with a single car¬ 
dinal tooth in one valve, locking between two in the opposito 
one, which is provided with a strong, lateral, elevated, slightly 
recurved, cleft tooth, for the reception of the opposito simple 
one, striated like S. siliqua. 
The Pleistocene Marine Formation, Ireland. 
5. Solen legumen. —The Pea-pod Solen, pi. XCIV. f. 13. 
Solenocurtus legumen. Brown, Ill. Rec. Con. Brit. p. 113. 
pi. 47, figs. 8, 9, 9.* 
Greatly elongated transversely, much compressed and thin ; 
umbones placed to one side, but hardly marked; hinge with 
two small, erect, recurved, cardinal teeth in one valve, between 
which an erect thin tooth in the opposite valve is locked ; 
surface very smooth ; rounded at both sides. 
The Pleistocene Marine Formation, Ayr. 
6. Solen affinis. —The Allied Solen, pi. XCIV. fig. 16. 
S. affinis. Sowerby, I. p. 15, pi. 3. 
Transversely elongated, arcuated, thin and much com- 
prossed; gaping at both sides ; hingo placed near one side ; 
surface smooth. 
The London Clay, Highgate and Kingston. 
7. Solen pelagicus. —The Sea Solen, pi. XCIV. fig. 15. 
S. pelagicus. Portland, Geo. Rep. p. 441, pi. 36, fig. 4. 
Transversely elongated; straight, lancet-shaped,rounded at 
both extremities; a small beak near the broader end, pro¬ 
ducing a bend under the margin; a keel-like ridge from the 
beak to the posterior margin. 
The Carboniferous Limestone, Clogher, Tyrone. 
Genus LXIX.—PIIOLADOMYA.— J. Sowerby. 
Shell transverse, inequilateral, equivalve, ventricose, very 
thin and hyaline; anterior side more or less elongated and 
gaping ; posterior side sometimes very short, rounded; upper 
edge slightly gaping; hinge with a small, rather elongated, 
triangular pit, and a marginal lamina in each valve; to the 
outer surface of wdiich is attached a somewhat short external 
ligament; inside pearlaceous; two indistinct, muscular impres¬ 
sions ; muscular impression of the mantle nearly obsolete, and 
with a large sinus. 
1. Pholadomya mAUGA iUTACEA. —The Pearly Pholado- 
mya, pi. LXXX. figs. 8, 9. 
Cardita margaritacea. Sowerby, III. p. 175, pi. 297, f. 2. 
Transversely ovate, its width exceeding its length ; in¬ 
flated; anterior side a little produced, provided with an ob¬ 
scure, longitudinal keel, and several small ridges, concentri¬ 
cally and irregularly undulated; beaks prominent, greatly in- 
curvod, and with a considerable hollow beneath them. 
London Clay, Bognor; Richmond, Isle of Wight, and 
Brentford. 
2 . Pholadomya producta.—T he Produced Pholadomya, 
pi. XCV. fig. 8. 
Cardita (?) producta. Sowerby, III. p. 219,pi. 197, f. 1. 
Gibbose, transversely oblong, being about a third wider 
than long ; surface with six or seven longitudinal ridges, which 
are higher towards their posterior half; anterior side pro¬ 
duced aud plain; beaks rather prominent. 
Lias, Bath, and Peterborough. 
3. Pholadomya ortusa. —The Obtuse Pholadomya, pi. 
XCV. fig. 6. 
