SHELLS OF THE UPPER LUDLOW ROCK. 



609 



Loc. Ludlow, very abundant ; Kington, Herefordshire $ and very generally throughout the 

 Upper Ludlow Rock of Salop), Hereford, Radnor, fyc. 

 Cypricardia ? amygdalina, f. 2. Transversely ovate, elongated, obtusely keeled, smooth • posterior 

 extremity pointed; hinge line straight ; beaks short, very near to the anterior extremity; valves 

 deep. Frequently much distorted by pressure. Length 1^ inch, width |- inch. 

 Loc. Abundant in the Ludlow promontory, and very generally characteristic of the Upper 

 Ludlow Rock. 



Cypricardia ? impressa, f. 3. Transversely oblong, smooth; anterior extremity slightly truncated, 

 the other pointed obtusely ; front concave ; hinge line straight, long ; beaks near the anterior 

 extremity. Variable in size. Very much like the last, but more rounded, and further distin- 

 guished by the depression along the middle. Length 7 lines, width 1 inch 3 lines. 

 Loc. Delbury near Ludlow. 



Cypricardia? undata, f. 4. Transversely elongated, very convex; surface largely undulated; 

 front concave; beaks short, close to the anterior extremity; lunette- heart-shaped. Length 

 ^ an inch, width 1 inch. 

 Loc. Near Aymestry. 



Cypricardia? retusa, f. 5. Heart-shaped; anterior extremity rather pointed, and separated from 

 the other parts by a concave space ; beaks large. Length 5 lines, width 8 lines. 

 Loc. Delbury. 



Cypricardia cymbceformis, var., f. 6. {Cardites carpomorphus? Balm. Act. Holm. 1824., p. 372. 

 t. iv. f. 2; Cardium carpomorphum? Hisinger Petr. Suec, 63. t. xix. f. 5.) Transversely 

 oblong ; valves deep, carinated ; the keel acute, extending from the beak to the angular ex- 

 tremity of the narrow, oblique, produced posterior side ; beaks short, incurved, close to the 

 small heart-shaped anterior side. Length 7 lines, width 1 inch 4 lines. 



This differs from C. cymbceformis of the Old Red Sandstone in being less inflated and rather 

 wider. Both are much less triangular and shorter in proportion than Cardites carpomorphus 

 of Dalman, of which, however, we have only seen the figure. Serpulites longissimus ?, Cu- 

 cullcea antiqua, Leptcena lata, and Bellerophon expansus occur in the same mass with the 

 specimen before us. 

 Loc. Ludlow. 



Pullastra complanata, f. 7' Transversely elongated, twice as wide as long, smooth, rather flat ; 

 anterior extremity small, rounded ; posterior extremity pointed, its edge oblique ; beaks not 

 prominent, very near the anterior extremity. Length f inch, width 1| inch. 



This differs from P. Icevis of the Old Red Sandstone chiefly in the angular form of the pos- 

 terior margin. 



Loc. Darley Brook, Linley, near Bridgenorth ; rare. 

 *Cucullcea antiqua. (See PI. 3. f. 1 b.) 

 Loc. Ludlow. 



Nucula t ovalis, f. 8. Transversely oval, rather convex; beaks pointed, near the anterior side. 



Length nearly 4 lines, width 5 lines. 



Not having been able to clear the stone from the hinge of the only specimen obtained of this 



fossil, which is a cast of the interior, the genus remains doubtful. 



Loc. Trew erne Hills on the Wye, Radnorshire. 

 Avicula retrojiexa? f, 9. {Hisinger. Act. Holm. 1826. t. vii. f. 9; Petr. Suec. 57. t. xvii, f. 12.) 



