SHELLS OF THE WENLOCK SHALE. 



629 



This is a shorter shell than M. Nilssoni of Hisinger, and does not gape, otherwise it seems to 

 be nearly related to that fossil. 

 Loc. Glass House Hill, east flank of May Hill. 

 Leptana transversalis, f. 2. (Daim. I. c. p. 109. t. 1. f. 4 ; His. Pet. Suec. p. 69. t. xx. f. 5.) Semi- 

 circular, very convex, finely striated and costated longitudinally ; costse linear, distant ; hinge 

 inflected; hinge line straight, equal in length to the width of the shell; lesser valve very con- 

 cave. Length about 7 lines, width 8 or more. 



Loc. Hay Head and Tame Bridge, near Wallsall ; Woolhope ; Burrington ; Buildwas Bridge ; 

 Stumps Wood, near Ledbury. 

 Leptmna Icevigata, f. 3. Semicircular, depressed, with projecting angles or ears at the extremities of 

 the hinge line ; surface shining, obscurely marked with minute concentric waves and a few ra- 

 diating lines ; front slightly depressed. Length 2\ lines, width excluding the ears 4 lines. 



It may be doubted whether this be an Orthis or Leptcena ; we have seen but one valve. 

 Loc. Burrington, near Ludlow. 

 Lepttena minima, f. 4. Hemispherical, sharply radiated ; radii alternately long and short, smooth. 

 Length 2 lines, width 3 lines. 



A very neatly formed and regularly striated species. 

 Loc. Burrington. 

 Leptcena euglypha. (See PI. 12. f. 1.) Also Wenlock Limestone. 

 Loc. Woolhope. 



Leptmna depressa. (See PI. 12. f. 2.) Also Wenlock Limestone. 



Loc. Woolhope; Tynewidd ; Croft; Hay Head ; Frith Wood Coppice. 



Atrypa compressa, f. 5. Ovato-orbicular, transverse, rather compressed, smooth ; front slightly in- 

 dented ; beaks very small. Length 5 lines, width 6 lines. 

 Loc. Woodside and Nash, near Presteign. 



Atrypa depressa, f. 6. Transversely obovate, compressed, smooth, with about 3 obscure furrows 

 along the middle ; sides depressed ; the front much elevated ; the elevated portion square ; 

 beaks unequal. Length 4 lines, width 5 lines. 

 Loc. Stumps Wood, Malverns ; Delves Green, near Wallsall, 



Atrypa rotunda, f.7. Nearly orbicular, very convex, smooth, with 5 obscure furrows; front elevated; 

 beaks small, equal. Length 7 lines, width *l\ lines. 

 Loc. Escarpments of Wenlock Edge. 



Atrypa linguifera, f. 8. Orbicular, very convex, smooth ; front elevated, the elevated portion tongue- 

 shaped ; beaks large, unequal. Length 9 lines, width the same ; depth of both valves together 

 7|- lines. 



A nearly globose shell with prominent beaks. 



Loc. Stumps Wood; Valley of Woolhope ; Delves Green. 

 Atrypa tenuistriata. (Terebratula obtusa, Sower by in Linn. Trans, vol. xii. p. 516. t. 28. f. 3 and 4.) 



(See PI. 12. f. 3.) Also Wenlock Limestone. 



Loc. Woolhope ; Malvern Hills. 

 Atrypa galeata. (See PI. 12. f. 4.) Also Wenlock Limestone. 



Loc. Delves Green and Hay Head, near Wallsall; Frith Wood, near Ledbury ; Woolhope. 

 Atrypa affinis. Also Aymestry Limestone. (See PI. 6. f. 5.) 



Loc. Stumps Wood; Tame Bridge; Nash; Hay Head ; Croft; Woolhope; Frith Wood Coppice ; 

 Delves Green. 



