626 



SHELLS OF THE WENLOCK LIMESTONE. 



Euomphalus discors, f. 18. (M. C. t. 52. f. 1.) The upper part of this shell being covered by coarse 

 undulating laminae or scales, and the under by fine close ridges only, render it easy to be di- 

 stinguished. 



Loc. Wenlock; Dudley. 



Euomphalus rugosus, f. 19. [M. C. t. 52. f. 2. E. catenulatus. His. Pet. Suec. p. 37. t. xi. f. 9.) The 

 two surfaces of this shell being alike, distinguish it from the last. We see no reason for sup- 

 posing E. catenulatus of Hisinger to be different. 

 Loc. Wenlock; Dudley. 



Euomphalus funatus, f. 20. (M. C. t. 450. f. 1, 2. His. Pet. Suec. p. 37. t. xi. f. 11.) The sharp con- 

 centric ridges joined by lines of growth, distinguish this species. 

 Loc. Wenlock; Dudley; Abberley ; Walsall; Benthall Edge ; and many other places. 



Euomphalus sculptus, f. 17- Depressed, conical; surface ornamented with concentric furrows and 

 elevated lines ; whorls about 3 ; aperture circular ; umbilicus large. Height 8 lines ; diameter 

 nearly 1^ inch. 



The concentric lines and furrows, which are numerous but not deep, give an elegance to this 

 fossil. 



Loc. Ledbury ; Eastnor Park. 



Orthoceras Brightii, f. 21. Conical, elongated, smooth?; siphuncle nearly central, large, cylin- 

 drical ; septa f. Their diameter apart. Diameter about If inch. 



Judging from the fragments we have examined of this large specimen, we suppose it to taper 

 more rapidly than its congeners ; the marks upon the siphuncle indicate very close septa, but 

 we have not been able to trace the degree of their convexity. The septa have been extended a 

 short way into the siphuncle, which is occupied by stone ; the chambers are filled with white 

 calcareous spar, which has received a tinge of brown around the siphuncle. From the rich 

 collection of Mr. B. Bright. 

 Loc. Western flanks of Malvern Hills. 



Orthoceras annulatum. (See PI. 9. f. 5.) Also in Wenlock Shale. 

 Loc. Hay Head, Walsall; Nash Scar, Presteign. 



Orthoceras pyriforme. (See PI. 8. f. 19 and 20.) Also Lower Ludlow. A small individual ; the, 

 diameter of the base of its last chamber is nearly \\ inch. 

 Loc. Ledbury. 



Lituites? Biddulphii, PI. 11. f. 8. We have seen a fragment only of this shell, consisting of a cast 

 from the inside of the two last chambers, but it shows that the whorls were flat on their 

 sides, that they increased in size rather rapidly, and that each received a slight impression 

 from the preceding one. The length of the aperture is 17 fines, width 13 lines. Many indi- 

 viduals of the minute shell Spirorbis tenuis are imbedded on the cast, having been detached 

 from the inner surface of the Lituite where they had taken up their residence after the Ce- 

 phalopod had quitted it. Found by Mr. Ormus Biddulph, whose cabinet has furnished other 

 species for the illustration of this work. 

 Loc. Ledbury. 



Lituites gig ant eus. (See PI. 11. f. 4.) Also Lower Ludlow. 

 Loc. Aston near Ludlow. 



Conularia quadrisulcata, Miller, f. 22. (M. C. t. 260. f. 3 and 4 ; His. Pet. Suec. p. 30. t. x. f. 5 ; 

 C. Sowerbii, Defr. Blainv. Malacol. p. 377. t. xiv. f. 2 b, c, dand e.) This fossil is little under- 

 stood. In all probability it ought to be ranked in a higher class than Mollusks. The specimen 

 figured shows a septum in a very perfect condition ; it is convex, with a sharpish compressed 



