618 



SHELLS OF THE LOWER LUDLOW ROCK. 



much smallest, transversely furrowed, furrows extending into the middle of the shell ; beaks 

 prominent, near the anterior extremity. Length 2 inches, width 1 inch. 



A portion of the anterior extremity of the most perfect specimen of this shell being wanting, 

 we are quite uncertain of the genus ; very probably it does not belong to Modiola. 

 Loc. Shelderton Hill ; and near Aymestry. 

 Avicula reticulata. Also Aymestry Limestone. (See PI. 6. f. 3.) Casts in a soft ferruginous 

 stone. 



Loc. Myddleton Hall, Caerrnarthenshire. 



Leptazna Lepisma {Halm.?), PL 8. f. 7. Semicircular, convex, shining, with a few obscure slightly 

 elevated forked rays ; hinge line equal to the width ; front moderately deflected. Length about 

 3 lines, width 5£ lines. 



A pretty shell with a satin-like tissue ; a few punctures in the substance give obscure indi- 

 cations of minute spines. 

 Loc. Near Clungunford. 



Leptcena euglypha. Productus euglyphus. (See PI. 12. f. I.) More frequent in Wenlock Lime- 

 stone. 



Loc. Eastnor Park; Myddleton Hall, Caerrnarthenshire. 

 Leptcena depressa. Productus depressus. (See PI. 12. f. 2.) More frequent in Wenlock Limestone. 



Loc. Abberley ; the Hayes, Dudley ; Myddleton Hall, ivith L. euglypha, Sfc. 

 Orthis orbicularis t (See PI. 5. f. 16.) Also Upper Ludlow Rock. 



Loc. Myddleton Hall j Oldcastle, Malverns ; Abberley', near Aymestry. 

 Atrypa obovata, PI. 8. f. 8 and 9. Transversely obovate ; convex, smooth ; beaks small, close 5 



front with a marginal elevation in one valve, forming a rounded sinus in the edge of the other. 



Length 5 lines, width 5| lines. 



Loc. Mathon Lodge ; west flank of the Malvern Hills. 

 Atrypa didyma (Halm.). (See PL 6. f. 4.) Also Aymestry Limestone, &c. 



Loc. Shelderton Hill, Ludlow. 

 Atrypa galeata, (Halm.), PL 8. f. 10. (See PI. 12. f. 4.) Also Wenlock Limestone. The section 



figured here shows the internal septa, which are not so well seen in the specimens from the 



Wenlock Limestone. 



Loc. Ludlow escarpments j Stumps Hill; Eastnor Park; Oldbury Camp; Westwood 

 Common ; Pendle beds, Aymestry (Sitch Wood, Ledbury). 

 Atrypa affinis. (M. C. 324.) (See PI. 6. f. 5.) More frequent in Aymestry Limestone, &c, 



Loc. Myddleton Hall ; Turner's Hill, Dudley. 

 Atrypa aspera (Scloth.). (See PL 12. f. 5.) Also Wenlock Limestone. 



Loc. West flan k of Malverns. 

 Spirifer radiatus. (M. C. 493.) (See PL 12. f. 6.) Also Wenlock Limestone. 



Loc. West flank of Malverns ; Myddleton Hall. 

 Spirifer trapezoidalis ? (Dalm.) (See PL 5. f. 14.) Also Wenlock Shale. 



Loc. Mathon Lodge. 

 Terebratula Wilsoni. (See PL 6. f. 70 Also Aymestry Limestone. 



Loc. Sitch Wood; Turner Hill. 

 Lingula lata, PL 8, f. 11. Obovate, squarish, flat, smooth ; front edge truncated. Width about 



2 lines, length 3 lines. 



Loc. Ludlow escarpments, viz., Elton, Evenhay, S?c. 



