SPIRIFERIDyE. 



97 



Pan, Cefn Ila, Ty Newydd, Cilorgyr, etc., in the Usk district ; at Crew's Hill, Alfrick ; 

 at Cwm Craig ddu, &c. ; also in Ludlow beds at Kendal in Westmoreland, and Dingle, 

 Co. Kerry. 



In the Aymestry Limestone of Sedgley, near Dudley, north-east of Pilliard's Barn, 

 Bodenham, in the Woolhope district ; Ankerdine Hill (Abberley district) ; Beech Hill, 

 Llancayo, west of Darran, and Russell's Parm, in the Usk district. 



In the Upper Ludlow beds at Dafaddfa Uchaf, in the Llandeilo district. South 

 Wales, and Ludlow Lane ; also at Frith, in the Malvern district. 



Prof. M'Coy says it is abundant in the siliceous Upper Ludlow rock of Lambrigg 

 Fell, Benson Knott, and north end of Potter's Fell ; all near Kendal, Westmoreland. 



It is found also in the Downton Sandstone in the Woolhope and Ludlow districts. 



On the Continent it occurs in rocks of the Wenlock age, in Gothland, as well as near 

 Christiania in Norway. Prof. Schmidt has also foimd it in the Isle of Oesel. 



Spirifera crispa, Hisinger. PI. X, figs. 13 — 15. 



Terebkatula crispa, Hisinger (not of Linnceus). Vet. Akad. Handlingar, tab. vii, 

 fig. 4, 1826. 



Delthyris crispa, Balman. Vet. Acad. Handl., p. 222, tab. iii, fig. 6, 1828. 



— — Hisinger. Anteckningar, vol. iv, pp. 220 and 238, tab. vii, fig. 4, 



1828. 



— — Id. Ibid. vol. V, p. 119, 1831. 



— — Id. Lethsea Suecica, p. 73, pi. xxi, fig. 5, a, b, 1837. 

 Spirifer crispus, Von Buck (pars). Ueber Deltbyris, &c., p. 40, 1837. 



— — Soio. Sil. Syst., pi. 12, fig. 8, 1839. 



_ _ M'Coy. Synops. Irish Sil. Foss., p. 37, 1846. 



— — Davidson. Bull. Soc. Ge'ol. France, 2nd ser., vol. v, p. 325, pi. iii, 



fig. 42, 1848. 



? — — Hall. Pal. New York, p. 262, pi. liv, fig. 3, 1852 (perhaps, Sp. 



elevala, Dalman). 



— — Schmidt. Silur. Format. Ehstland, &c., p. 21 1, 1858. 

 _ _ Salter. Siluria, 2nd edit., pi. xxi, fig. 4, 1859. 



Spirifera ceispa, M'Coy. Brit. Pal. Foss, p. 193, 1852. 



— — Lindstrdm. Proc. Roy. Acad. Sc. Stockholm, p. 360, 1860. 



Spec. Char. Shell small, transversely oval ; valves moderately convex ; hinge-line a 

 little shorter than the width of the shell ; cardinal angles rounded. Dorsal valve rather 

 less deep than the ventral, with three, five, or seven ribs, of which the central one is the 

 largest, although in elevation exceeding but little those that are next to it on either side. 

 Ventral valve rather more convex than the opposite one, plications two or three on either 

 side of sinus. The whole surface of both valves covered by numerous, sharp, regular, 

 concentric, slightly projecting lines of growth: beak moderately incurved; area 



13 



