MOLLUSCA 

 T. GUTTATUS. — The Spotted Trochus, pi. XXXIX 



76 



11. 

 fig. 17. 



Trochus guttatiu. Phillips, Geo. of Yorkshire, p. 112, pi. 

 G, fig. 14. 



Shell depressed, suhconic; hase 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 Ilock, near Scarborough. 



12. T. LINEARIS. — The Lincated 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, v»ith 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. BETici'LATUs. — The Reticulated Trochus, pi. 

 XXXIX. fig. 19, 20. 



Trochus reticulatus. Sowerby, Min. Conch. III. p. 128, pi. 

 272, fig. 2. Fleming, Brit. An. p. 325. 



Shell conical, subturreted; body largo; 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 flatlened; aperture obtusely quadrangular; 

 base provided with a close umbilicus ; whole surface covered 

 with numerous spiral and longitudinal slri^, the former con- 

 nected by some which are less elevated; diameter of ihe base 

 about equal to the length of the shell. 



Found in the Kimineridge Clay at Ringstead Bay, near 

 Weymouth ; and also at Portland Ferry. 



14. T. Anglicus.— 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 ejrtensus. Sowerby, Min. Conch. III. p. 110, 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 umbihcus, and is sometimes covered over in the 

 adult shells. 



Trochus. 



Found in the London Clay at Highgate Tunnel ; and in the 

 ClifT, Isle of Sheppy. 



16. T. BENETri.E.--Benett's Trochus, pi. XXXVII.* fig. 

 37, 38. 



Trochus Benettia. 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 Benetl, and named in 

 honor of her. 



17. T. MONiLiTECTUS — The Necklace-roofed Trochus, pi. 

 XXXVIIL fig. 9.. 



Trochus monititectus. 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 ; basa 

 produced, and destitute of an umbilicus. 



Found in the Cave Oolite at Cloughton Wyke. 



18. T. L^viGATUS.— -The Smooth Trochus, pi. XXXIX. 

 fig. 24, 25. 



Trochus Itevigatus. 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. ARENosL's. — 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. PHOMINEUS. — The Prominent Trochus, pi. XXXIX. 

 fig. 27. 



Trochus promineus. Fleming, Brit. An. p. 32i. 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. 



