198 



CONCHIFERA. 



Cypricardia. 



Genus XXL— EDBIONDIA.— A'owiwc^. 



Shell tumid ; equivalve, inequilateral ; transversely sub- 

 oval' or rounded ; surface with transverse strise ; lunule with 

 a hiatus ; hinge destitute of teeth ; the cardinal lamina 

 transverse and internal ; ligament internal, situate in a deep 

 pit. 



1. Edmondia pnionifobmis. — The Unio-formed Edmondia, 

 pl.LXXXI. fig. 15. 



E. unioniformis. Koninck, p. 67, pi. 1, fig. 4. hocardia 

 unioniformis. Phillips, Geo. York, II. p. 209, pi. 5, fig. IS. 



Transverse, slightly ovate, gibbose ; anterior side rather 

 shorter than the other, and rounded ; posterior a little nar- 

 rowed ; beaks obtuse, incurved, and approximate ; base 

 considerably arcuated ; surface with the posterior side con- 

 siderably wrinkled transversely. 



The Carboniferous Limestone, Bolland. 



Genus XXIL— CYPRICARDIA.— Xa»irt»r/t. 



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 cymb^eformis. — The Boat-formed Cypri- 

 cardia, pi. LXXXI. figs. 1, 2. 



C cymhceformis. Sowerby, Silur. Syst. pt. II. p. C02, 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 sliort and incurved, and obscurely undulated trans- 

 versely below. 



Found in the lowest beds of the Old Red Sandstone, at 

 Felindre-on-the-Teme, ten miles west of Knighton. Variety 

 «, 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 i.mpressa. — The Impressed Cypricardia, 

 pi. LXXXI. fig. U. 



C. (?) impressa. Sowerby, Silur. Syst. pt. II. p. 609, pi. 

 :>, fig. 3. 



Shell transversely oblong- ovate, much inflated, smooth ; 

 hinge-line long, and almost straight; anterior side slightly 

 truncated ; posterior side obtusely pointed ; base 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- 



ll)W. 



3. Cypricardia amygdalina.— The Almond-shaped Cy- 

 pricardia, pi. LXXXI. figs. 5, 6. 



C. (?) amygdalina. Sowerby, Silur. Syst. pt. II. p. 6(19, 

 pi. 5, fig. 2. 



Shell transversely oblong-ovate, smooth ; valves deep and 

 obtusely carinated ; anterior side short, cordiforra, and obtuse ; 

 posterior side somewhat acute ; beaks short, obtuse, and jilaced 

 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 has 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. II. p. 609, pi. 5, f. 4. 



Shell transversely elongated, extremely convex ; surface 

 with rather deep and wide undulations ; beaks short, placed 

 close to the anterior side ; lunette cordiform ; front concave, 

 a slight hollow proceeding from the 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-formed 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 rhombea. — The Rhomboidal Cypricar- 

 dia, pi. LXXXI. fig. 3. 



C. rhomhea. Phillips, Geo. York, II. p. 209, \A. 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 glabrata. — The Very Smooth Cypri- 

 cardia, pi. LXXXI. fig. 10. 



C. glabrata. Phillips, Geo. York, II. p. 209, pi. o, 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 line nearly straight. 



The Carboniferous Limestone, Bolland. 



9. Cypricardia pectenifera. — The Pectinated Cypricar- 

 dia, pi. LXXXL fig. 11. 



Venus (1) jMcteni/era. Sowerby, III. p. 2G, pi. 422, fig. 4. 



