198 
CONCHIFERA. 
Cypricardia. 
Genus XXI.— E DMO N DIA. —Kon inch. 
Shell tumid; equivalvc, inequilateral; transversely sub¬ 
oval, or rounded ; surface with transverse strhc ; lunulo with 
a hiatus; hinge destitute of teeth; the cardinal laminae 
transverse and internal; ligament internal, situate in a deep 
pit. 
1 . Edmondia unioniformis. —The Unio-formed Edmondia, 
pi. LXXXI. fig. 15. 
E. unioniformis. Koninck, p. 67, pi. 1, fig. 4. Isocardia 
unioniformis. Phillips, Geo. York, II. p. 20.0, pi. 5, fig. 18. 
Transverse, slightly ovate, gibbose; anterior side rather 
shorter than the other, and rounded; posterior a little nar¬ 
rowed ; beaks obtuse, incurved, and approximate ; baso 
considerably arcuated; surface with the posterior side con¬ 
siderably wrinkled transversely. 
The Carboniferous Limestone, Bolland. 
Genus XXII.—CYPRICARDIA.— Lamarck. 
Shell equivalve, inequilateral, obliquely or transversely 
elongated ; posterior side very short; hinge with three teeth 
in each valve, situated immediately within and behind the 
umbo; and one rather lengthened lateral tooth extending to¬ 
wards the anterior side ; two somewhat irregular lateral mus¬ 
cular impressions; mantle, or palial impression, very indis¬ 
tinct, and nearly obsolete. 
1. Cypricardia cymbasformis. —The Boat-formed Cypri¬ 
cardia, pi. LXXXI. figs. 1, 2. 
C. cy micefor mis. Sowcrby, Silur. Syst. pt. II. p. 602, pi. 
3, fig. 10 a . Variety, p. 609, pi. 5, fig. 6. 
Transversely oblong, its breadth being nearly double its 
length ; beaks small, incurved, placed near the heart-shaped 
anterior side; produced; posterior side suddenly contracted into 
a point; valves very deep, acutely carinated, extending from 
the beak to the angular extremity; striated towards the beaks, 
which are short and incurved, and obscurely undulated trans¬ 
versely below. 
Found in the lowest beds of the Old Rod Sandstone, at 
Felindre-on-thc-Teme, ten miles west of Knighton. Variety 
a, fig. 2, differs from fig. 1, in being less inflated and somewhat 
wider. It is found in the Upper Ludlow Rock at Ludlow. 
2. Cypricardia tmpressa.— The Impressed Cypricardia, 
pi. LXXXI. fig. 14. 
C. (?) impressa. Sowerby, Silur. Syst. pt. II. p. 609, pi. 
5, fig. 3. 
Shell transversely oblong-ovate, much inflated, smooth ; 
hinge-lino long, and almost straight; anterior side slightly 
truncated ; posterior side obtusely pointed; baso concave ; 
beaks rather blunted, and placed near the anterior extremity; 
a depression from the umbones towards the base, where there 
is a slight flexure ; length nearly seven-eighths of an inch ; 
breadth one inch and three-eighths. 
Found in the Upper Ludlow Rock at Delbury, near Lud¬ 
low. 
3. Cypricardia amygdalina. —The Almond-shaped Cy¬ 
pricardia, pi. LXXXI. figs. 5, 6. 
C. (?) amygdalina. Sowerby, Silur. Syst. pt. II. p. 609, 
pi. 5, fig. 2. 
Shell transversely oblong-ovate, smooth ; valves deep and 
obtusely carinated ; anterior side short, cordiform, and obtuse; 
posterior side somewhat acute ; beaks short, obtuse, and placed 
very near the anterior side ; length one inch ; breadth one inch 
and a quarter. 
Found in the Upper Ludlow Rock, of which it is a good 
characterestic, from its abundance. It lias much the general 
aspect of C. impressa , but not so much rounded as that species. 
4. Cypricardia undata. —The Waved Cypricardia, pi. 
LXXXI. fig. 4. 
C. (?) undata. Sowerby, Silur. Syst.pt. 11. p. 609, pi. 5, f. 4. 
Shell transversely elongated, extremely convex ; surface 
with rather deep and wido undulations; beaks short, placed 
close to the anterior side; lunette cordiform ; front concave, 
a slight hollow proceeding from tlio umbones in an arcuated 
form towards the margin; length about half an inch ; breadth 
one inch. 
In the Upper Ludlow Rock, near Aymestry. 
5. Cypricardia solenoides. —The Solen-formcd Cypricar¬ 
dia, pi. LXXXI. fig. 9. 
C. solenoides. Sowerby, Silur. Syst. pt. II. p. 617, pi. 
8, fig. 2. 
Shell transversely elongated, somewhat compressed ; beaks 
obtuse, placed near the anterior side, which is short and 
rounded; posterior side obliquely sub-truncated, terminating 
in a produced point; lunette large and deep ; length nearly 
six-eighths of an inch ; breadth about an inch and an eighth. 
In the Lower Ludlow Rock, at Ludlow Escarpements and 
Abberly. 
6. Cypricardia retusa. —The Blunted Cypricardia, pi. 
LXXXI. fig. 12. 
C. retusa. Sowerby, Silur. Syst. pt. II. p. 609, pi. 5, f. 5. 
Shell cordiform, smooth, sub-depressed; beaks large, long, 
and sub-acute; anterior side a little pointed, and separated 
from the other parts by a concave space ; posterior side long 
and slightly truncated obliquely ; length a little more than 
half an inch ; breadth about an inch. 
In the Upper Ludlow Rock, at Delbury. 
7. Cypricardia rrombea. —The Rhomboidal Cypricar¬ 
dia, pi. LXXXI. fig. 3. 
C. rhomhea. Phillips, Geo. York, II. p. 209, pi. 5, fig. 10. 
Rhomboidal; anterior side short, a little rounded ; posterior 
side large, obliquely truncated, with a keel extending from the 
beak to the extreme angle of the base, which is nearly straight; 
back a little convex ; beaks obtuse. 
The Carboniferous Limestone, Bolland and Northumberland. 
8. Cypricardia glarrata. —The Very Smooth Cypri¬ 
cardia, pi. LXXXI. fig. 10. 
C. glabrata . Phillips, Geo. York, II. p. 209, pi. 5, f. 25. 
Transversely rhomboidal; anterior side very short, nearly 
straight; posterior side lengthened, with an oblique keel from 
the beak to the margin; surface glossy, with transverse fur¬ 
rows ; basal lino nearly straight. 
The Carboniferous Limestone, Bolland. 
9. Cypricardia pectenifera. —The Pectinated Cypricar¬ 
dia, pi. LXXXI. fig. 11. 
Verms (?) pectenifera. Sowerby, III. p. 26, pi. 422, fig. 4. 
