DESCRIPTION OF THE FOSSILS. 
209 
Sanguinolaria ? tumida. Ph. PI. V. fig. 3 . Kildare ; Holland ; Coal- 
brook dale ; Kirby Lonsdale. 
Transversely elongated, diagonally gibbous, hinge straight ; shell imbricated. In 
the cast the posterior side is marked by strong ridges from the beak (not well seen in 
this figure, which is reduced from a large Irish specimen.) 
Sanguinolaria ? arcuata. Ph. PI. V. fig. 4. Harelaw, Northumberland. 
Transversely elongated, oval, hinge arched, surface smooth. 
Sanguinolaria ? sulcata. Ph. PI. V. fig. 5 . Northumberland. 
Transversely oval, depressed ; ends rounded ; surface with transverse furrows which 
become broad wrinkles on the posterior side; obsolete longitudinal striae. (Iliatella 
sulcata Fleming ?) 
Solemya primaava. Ph. PI. V. fig. 6. Northumberland. 
Transversely elliptical, depressed, with radiating smooth striae, 
Corbui.a? senilis. Ph. PI. V. fig. 1. Castleton ; Bolland ; Colsterdale. 
Transversely ovate, gibbous, hinge line straight, surface wrinkled, often more regu- 
larly than in the figure. 
Isocardia? axiniformis. Ph. PI. V. fig. 13. Northumberland. 
Cuneiform, beaks involute, surface glabrous, fine concentric striae. 
Isocardia oblonga. Sow. PI. V. fig. 9. Kildare ; Bolland; Dublin. 
Smooth ; posterior side expanded ; anterior side small, beaks curved into it. 
Isocardia unioniformis. Ph. PI. V. t. 18. Bolland. 
Ovate, rather gibbous, beaks approximate incurved, surface wrinkled on the pos- 
terior slope. 
Lucina? laminata. Ph. PI. V. fig. 12. Bolland. 
Truncate oval, very depressed, surface transversely imbricated. 
Venus parallela. Ph. PI. V. fig. 8. Bolland. 
Ovate, with subparallel sides ; anterior lunula deep, surface delicately furrowed. 
Venus elliptica. Ph. PI. V. fig 7, Northumberland, 
Oval, depressed ; with large transverse undulations. 
Cypricardia rhombea. Ph. PL V. fig. 10. Bolland ; Northumberland. 
Rhomboidal, valves diagonally carinated. 
Cypricardia glabrata. Ph. PI. V. fig. 25. Bolland. 
Ovato-rhomboidal, valves diagonally tumid. 
Modiola squamifera. Ph. PL V. fig. 22. Bolland. 
Surface covered with imbricated broad laminae of growth. 
Modiola lingualis. Ph. Pl. V. fig. 21. Castleton. 
Remarkably elongated, with a curved oblique convexity from the beaks ; lines of 
growth delicate, forming furrows on the convexity. 
