76 
11. T. guttatus _The Spotted Trochus, pi. XXXIX. 
fig. 17. 
Troclius guttatus. Phillips, Geo. of Yorkshire, p. 112, pi. 
6, fig. 14. 
Shell depressed, subconic; base very wide, its diameter being 
considerably more than the length of the shell; spire consisting 
of four volutions, at the base of each a band of large granules; 
the general surface smooth, with rust-coloured spots. 
Found in the Kelloways Rock, near Scarborough. 
12. T. linearis. —The Lineated Trochus, pi. XXXIX. 
fig. 18. 
Trochus linearis. Mantell, Geo. of Sussex, p. 110, pi. 18, 
fig. 17. Fleming, Brit. An. p. 325. 
Conical, subdepressed; volutions slightly convex, transversely 
striated, with a narrow prominent, spiral fillet in the centre, and 
at the base of each volution ; base flat; the umbilicus obscured 
by the last volution; aperture transversely depressed. 
Found at Hamsey and Middleham, Sussex. 
13. T. reticulatus. — The Reticulated Trochus, pi. 
XXXIX. fig. 19, 20. 
Trochus reticulatus. Sowerby, Min. Conch. III. p. 128, pi. 
272, fig. 2. Fleming, Bril. An. p. 325. 
Shell conical, subturreted; body large; spire consisting of six 
volutions, obliquely flattened above; their upper and under 
margins provided with a pretty broad and somewhat elevated 
carina, the upper one more prominent than the lower, and 
situate on the superior portion of the volutions, where they 
commence to be flattened; aperture obtusely quadrangular; 
base provided with a close umbilicus; whole surface covered 
with numerous spiral and longitudinal striae, the former con¬ 
nected by some which are less elevated; diameter of the base 
about equal to the length of the shell. 
Found in the Kimmeridge Clay at Ringstead Bay, near 
Weymouth; and also at Portland Ferry. 
14. T. Anglic us.—The English Trochus, pi. XXXIX. 
fig. 21. 
Trochus similus. Sowerby, Min. Conch. II. p. 95, pi. 142. 
Fleming, Brit. An. p. 324. 
Conical; body large; spire small, consisting of six or seven 
flat-sided, subturreted volutions, obliquely flattened above, and 
each provided with two spiral scries of large, somewhat de¬ 
pressed tubercles, the superior one at the slope of the volutions, 
and the lower ones at the base of each volution; three strong, 
elevated, spiral striae invest the whole surface of the shell, these 
are crossed by numerous sharp, close, and arcuated lines of 
growth; aperture quadrangular, with rounded angles; columella 
imperforforate; inner lip thickened. 
Found in the Blue Lias, near Yeovil, Shotover, Lackington 
Park, and at Weston, near Bath. 
15. T. extensus. —The Extended Trochus, pi. XXXIX. 
fig. 22, 23. 
Trochus extensus. Sowerby, Min. Conch. III. p. 140, pi. 
278, fig. 2, 3. Fleming, Brit. An. p. 325. 
Shell depressed, conical, its diameter being nearly twice its 
height; volutions elevated in the centre, obliquely striated, and 
with rugose undulations; margin of the body volution broad, 
thin, and undulated; base convex, smooth, with a large and 
nearly smooth umbilicus, and is sometimes covered over in the 
adult shells. 
Trochus. 
Found in the London Clay at Highgate Tunnel; and in the 
Cliff, Isle of Sheppy. 
16. T. Benettije. —Benett’s Trochus, pi. XXXVII.* fig. 
37, 38. 
Trochus Benettice. Sowerby, Min. Conch. I. p. 224, pi. 98, 
larger fig. 3. 
Shell conical, depressed; upper surface of the volutions ob¬ 
liquely and longitudinally wrinkled, their margin irregularly 
undulated; base expanded, and provided with a broad, project¬ 
ing scolloped margin; base concave; umbilicus plicated, and 
partly covered; aperture narrow and compressed. 
Found in the London Clay by Miss Benett, and named in 
honor of her. 
17. T. monilitectus. —The Necklace-roofed Trochus, pi. 
XXXVIII. fig. 9. 
Trochus monilitectus. Phillips, Geo. of Yorkshire, I. p. 
123, pi. 9, fig. 33. 
Shell conical, gradually tapering to an acute apex; whole 
surface covered with numerous moniliform, spiral ridges; base 
produced, and destitute of an umbilicus. 
Found in the Cave Oolite at Cloughton Wyke. 
18. T. ljevigatus. —The Smooth Trochus, pi. XXXIX. 
fig. 24, 25. 
Trochus Icevigatus. Sowerby, Min. Conch. II. p. 179, pi. 
181, fig. 2. Fleming, Brit. An. p. 324. 
Shell conical; body large; spire small, consisting of six 
slightly inflated volutions; base convex; columella smooth, 
oblique, and angular; aperture subrhomboidal, with rounded 
angles; whole surface smooth and glossy, with only a few 
nearly obsolete spiral grooves, and crossed by some fine, nearly 
invisible lines of growth; destitute of an umbilicus. 
Found in the Crag pits at Holywell. 
19. T. arenosus. —The Sandy Trochus, pi. XXXIX. fig. 
26. 
Trochus arenosus. Fleming, Brit. An. p. 324. Trochus 
granulatus , Sowerby, Min. Conch. III. p. 37, pi. 220, fig. 2. 
Shell conical, short, subturreted; volutions obliquely flat¬ 
tened, and a little rounded above, with a central spiral band; 
base convex, in part almost smooth; whole surface covered 
with spiral and longitudinal furrows, which produce a granulated 
appearance, varying in depth in different specimens, but for the 
most part are deepest towards the margin; height about half 
the diameter at the base. 
Found in the Inferior Oolite at Dundry. 
20. T. promineus. —The Prominent Trochus, pi. XXXIX. 
fig. 27. 
Trochus promineus. Fleming, Brit. An. p. 324. Trochus 
sulcatus , Sowerby, Min. Conch. III. p. 38, pi. 220, fig. 3. 
Shell conical, short, subturreted; spire consisting of four 
volutions, convex and flattened above, with a spiral sulcus 
around their centre, and finely striated spirally, sharp covering 
the whole surface on the superior volutions, while in the 
inferior ones they are limited to the marginal parts below the 
sulcus; crossed near the superior margins by many undulations; 
sulcus crossed by very minute striae; the whole surface exhibit¬ 
ing many fine lines of growth. 
Found in the Inferior Oolite at Dundry. 
MOLLUSCA. 
