﻿JURASSIC AND TRTASSIC BRACHIOPODA. 99 



38. Spiriferina oxyptera, Buvignier. Sup., PI. X, figs. 31, 32. 



Spiriferina oxyptera, Buvignier. Mem. de la Soc. Philom de Verdun, vol. ii, p. 



14, pi. viii, fig. 8, 1843 ; and Geol. des 

 Ardennes, p. 534, pi. v, fig. 5, 1852. 



— — Dav. Annals and Mag. of Nat. Hist., 2nd ser., vol. ix, pi. xv, 



figs. 5 — 7, 1852; and Geologist for December, 

 1862, p. 444, pi. xxiv, figs. 4, 4 a. 



— — E. Desl. Etudes Critiques sur des Brach. nouveaux ou peu 



connus, p. 67, pi. xi, figs. 6 — 10, 1863. 



Spec. Clear. Shell variable in shape, transverse ; valves convex, beak more or less 

 produced and incurved ; area narrow ; deltidium in two pieces ; hinge-line considerably 

 exceeding the width of the shell, and prolonged in the shape of pointed wings; surface 

 ornamented by a wide elevated mesial fold in the smaller valve, and corresponding sinus 

 in the larger one, with from four to six ribs on each of the lateral portions of the shell. 

 Structure punctuated and spinose. Dimensions variable : 

 Length 11, width 19, depth 8 lines. 



Obs. This species was described for the first time by Mr. Buvignier, who discovered 

 it in the Liassic beds of Carignan Sachy (Ardennes), where it is stated to be uncommon. 

 It is easily distinguishable by its wing-shaped expansions, recalling many Palaeozoic forms 

 in which the hinge-line greatly exceeds the width of the shell. Mr. Tesson found it 

 likewise in the Lias at Fontaine-Etoupe-Pour, near Caen, and I was fortunate enough to 

 pick up another very fine example at Croisilles, near Caen. In England, it has been met 

 with in the Middle Lias or zone of Am. Jamesoni at HuntclifF, Saltburn, Coatham, Scars, 

 and Redcar, in Yorkshire, also in the Middle Lias of the Bay of Caisaig, in the Island of 

 Mull, and by Messrs. Brice and R. Tate, in the zones of Am. armatus and Am. Jamesoni, at 

 Raasay, in Scotland. It occurs also in the Middle Lias at Issa, Aragon, Obon, and Josa, 

 in Spain. Mr. Deslongchamps informs us that the spinules which invest its surface are 

 similar to those seen in Sp. oxygona. 



39. ? Spiriferina Signiensis, Biw. Sup., PI. XI, fig. 11. 



Spirifer signiensis, Buv. Mem. Soc. Pliilom de Verdun, t. 2, p. 14, pi. v, fig. 9, 



1843 ; Geol. des Ardennes, p. 534, pi. iv, fig. 9, 1852. 



It is with considerable uncertainty that the imperfect specimen found by R. Tate is 

 referred by him to this species. It occurred in the shale bed below the main seam of 



