SHELLS OF THE LOWER LUDLOW ROCK. 



619 



Lingula? striata, PI. 8. f. 12. Obovate squarish, very flat, minutely striated transversely 5 front 

 edge truncated. Length 5 lines, width 4 lines. 



This is of the same shape as the last, but has minute striae, on its inner surface at least, and 

 thus closely resembles a fish's scale. Is it a shell ? 

 Loc. Near Aymestry. 



Euomphalus funatus. {M. C. t. 450.) (See PI. 12. f. 20.) Also Wenlock Limestone, &c. 



Loc. Myddleton Hall ; Ahberley. 

 Pleurotomaria undata, PI. 8. f. 13. Conical, with a convex base, obtuse ; whorls about 4, very 



convex or round, crossed by many oblique slightly prominent waves ; sinus in the lip deep, 



forming a narrow scarcely elevated band around the whorls ; aperture round. Height 2^ inches, 



diameter 2\ inches. 



Loc. Escarpments near Ludlow; Presteign ; Dean's Corner. 

 Pleurotomaria Lloydii, PI. 8. f. 14. Conical, with a very convex base, acute ; whorls about 5, 

 convex, ornamented with many strise, 5 carinas below and 2 above the prominent narrow band 

 which is formed by the filling up of the deep marginal sinus ; aperture longer than wide. 

 Height %\ inches, diameter \\ inch. 



This shell is much longer in form, and has less convex whorls than the last; it is often much 

 pressed ; but its carinae distinguish it well. Named after Dr. Lloyd of Ludlow, whose la- 

 bours in advancing the objects of this work have been often adverted to. 

 Loc. Shelderton Hill ; near Aymestry ; Dean's Corner. 

 Terebraf sinuosa, PI. 8. f. 15. Turreted, subulate; whorls numerous, convex, marked with sharp 

 lines of growth ; a wide, shallow, angular sinus in the edge of the lip, the angle a little above 

 the middle. Length li inch, diameter 5 lines. 



The sinus in the edge of the aperture is nearly right-angled, but it is indicated in our spe- 

 cimen only by the lines of growth ; independent of these lines, the whorls are smooth. 

 Loc. Garden House Quarry, Aymestry. 

 Orthoceras Ludense, PI. 9. f. 1 a. Very gradually tapering, smooth ; septa very convex, few ; si- 

 phuncle central. Diameter 2 inches. 



/3. f. 1 b. Surface marked with small annular waves near the aperture. Diameter 3^ inches. 



This fossil approaches to O. giganteum of the Carboniferous Limestone. We provisionally 

 employ a new name until we can define the specific character with greater precision. 



The waved lines in var. /3 are probably only lines of growth, and as they are upon the portion 

 free from septa, they may perhaps indicate a full-grown shell ; if so, it does not attain to the 

 size of O. giganteum of the Carboniferous Series. 

 Loc. Ludlow. 



Orthoceras gregarium, PI. 8. f. 16. Very gradually tapering, smooth; septa numerous, distant in 

 the young shell, deep ; siphon central, small ; aperture round. Length 4 to 6 inches, diameter 

 about \ an inch. 



This shell bears some resemblance to O. inaequiseptum of Professor Phillips, but is supposed 

 to be distinct. 

 Loc. Ludlow. 



Orthoceras distans, PI. 8. f. 17- Very gradually tapering, smooth; septa almost as distant as they 

 are wide, deep ; siphon large, eccentric; aperture nearly round; diameter about lj inch. 



We have only a few joints in any specimen of this very distinct shell. 

 Loc. Near Aymestry ; also at the Hay Head Limeworks near Bar Beacon, Staffordshire. 



