PRODUCTIDtE. 333 



Good interiors of this species are mucli required, and may turn up with further 

 search. 



Position and Locality. Chonetes striatella is stated in ' Siluria ' to occur in the 

 Llandovery (?), Wenlock, and Ludlow formations. I know it from the last two only. 

 Li the Woolhope Beds it occurs east of Merchlin, Conway. Li the Wenloch Beds at 

 Hay-head, near Walsall ; Burton and Brocton, near Wenlock, &c. In the Lower Ludloio 

 at Vinnal Hill ; Cefn Ila. In the Aymestry Limestone at Llangibby ; Shucknall Hill, &c. 

 In the TJpper Ludloio it is especially abundant, in a great number of localities, such 

 as Horeb Castle and Ludlow, Pont-ar-y-Llechan, Llangadoc ; north-east of Pillard's 

 Barn, Woolhope ; Barrel Hill, Woodbury Hill ; Overley, Brock Hill, &c., in the Malvern 

 district; Ankerdine Hill in the Abl)erley district; in several places in the Usk 

 district, as well as in that of Builth. North end of Potter's Fell and Underbarrow, 

 Kendal, Westmoreland. 



In Scotland it occurs in the Pentland Hills ; in Ireland at Ferriter's Cove, 

 Dingle, &c. 



Abroad it is not rare in the Island of Gothland ; it is found at Klinka, in Scania ; 

 at Malmokalven and Steensfiord, in Norway ; also in Esthonia and some other Russian 

 localities ; in North America, &c. 



Chonetes lepisma, Sow. (not Dalman) (sp.). PI. XLIX, figs. 13, 14. 



LEPTiENA LEPISMA, J. de C. Soiv. (not Dalman). Sil, Syst., p. 618, pi. viii, lig. 7, 



1839. 

 Chonetes laevigata, Etheridge. Catal. Foss. Mus. Pract. Geol., p. 4(3, 1865. 



Spec. Char. Shell small, semicircular, wider than long. Hinge-line slightly shorter 

 than the width of the shell ; cardinal extremities obtusely rounded ; ventral valve evenly 

 convex ; sides and front rounded ; beak small, not projecting ; area narrow ; fissure small. 

 Dorsal valve concave, following the curves of the opposite valve ; hinge-area linear. Surface 

 smooth, glistening, and marked by a few fine concentric lines of growth. Along the cardinal 

 edge of the ventral valve rise six slanting tubular spines, three on each side, which become 

 longer as they approach its extremities. Interior not known. 

 Length 4, width 5, depth ^ a line. 



Obs. While describing Leptana Icevigata, I pointed out the differences and respective 

 claims of the two species. In Sowerby's original specimen (fig. 14) the cardinal spines 

 are not preserved ; but whole blocks of a light-yellow limestone at Malvern are covered 

 with specimens of this small shell, many of which have still their cardinal spines (fig. 13) , 

 and of these examples may be seen in the Museum of Practical Geology. Leptcsna 

 margaritacea of Angelin, from Gothland, is in all probability the same as the shell under 



