22 6 
DESCRIPTION OF THE FOSSILS. 
C. pentagonalis. Ph. PI. XIII. fig. 8. Holland. 
Conical, obtuse, volutions subpentagonal, margin of the umbilicus acute, aperture 
oval, transverse. 
C. rotundatus. Sow. PI. XIII. fig. 15. Bolland ; Kirby Lonsdale ; 
Northumberland. 
Obtusely conical, volutions rounded. 
C. pileopsideus. Ph. PI. XIII. fig. 6. Bolland. 
Very depressed, irregularly striated. 
C. spiralis. Ph. PI. XIII. fig. 14. Bolland. 
Obtusely conical, volutions rounded, oblique and spiral striae. 
Turbo tiara. Sow. Ph. PI. XIII. fig. 9- Bolland. 
Conical ; whorls convex beneath, flattened on the sides, crowned on the upper part 
by very prominent elongated round ribs. 
T. semisulcatus. Ph. PI. XIII. fig. 10. Bolland. 
Ovato-conical ; whorls smooth below, longitudinally furrowed above. 
T. biserialis. Ph. PL XIII. fig. 11. Bolland. 
Ovato-conical, whorls bearing elongated tubercles alternating in two rows. 
Pleurotomaria. A considerable proportion of the following species 
certainly belongs to this genus. The others are at least allied to it. 
Mr. Sowerby’s Helix carinata M. C. t. 10, and Helix striata M. C. 
t. 171, belong to this genus. The specimen from which the figure in 
Min. Conch, t. 10, was drawn is copied in PI. XV. fig. 1. 
P. flammigera. Ph. PI. XV. fig. 2 . Bolland. 
Surface universally decussated with spiral and longitudinal striae ; band broad, de- 
pressed, with arched striae ; colour varied with zigzag flashes. 
P. tumida. Ph. PI. XV. fig. 3 . Bolland. 
Spire obtuse, whorls few, tumid, excavated above, band broad, depressed, with 
arched striae ; spiral striae indistinct. 
P. expansa. Ph. PI. XV. fig. 4. Bolland. 
Depressed-conical, whorls few ; band depressed, with arched stria; ; surface with 
oblique striae, and traces of spiral lines. 
P. sulcatula. Ph. PI. XV. fig. 5. Bolland; Isle of Man, &c. 
Depressed, conoidal, whorls few, convex, above spirally furrowed, beneath striated ; 
band narrow. 
P. sulcata. Ph. PI. XV. fig. 6. Bolland. 
Ovoid, spire acute ; whorls few, rounded, with rounded spiral sulci ; band obscure. 
