BRITISH DEVONIAN BRACHIOPODA. 



? Terebratula elongata, ScJtlotheim. PL I, fig. 9. 



Terebratulttes elongatus, Schloth. Akad. MiiDch., vol, vi, pi. vii, figs. 7 — 14,1816; 



and Nachtragen zur Petrefactenkunde, pi. xx, fig. 2, 

 1822. 



Some internal casts of a Terebratnla, resembling specimens of T. elongata, from our 

 British Permian shell-limestone, have been found in brown grits of the Upper Devonian (?) 

 (Pilton and Marwood series) of East Hill, Braunton, North Devon. 



Terebratula juvems, Soiv. PL I, figs. 10 — 15. 



Atrypa juvenis, Sow. Geol. Trans., 2d ser., vol. v, pi. 56, fig. 8. 



Terebratula juvenis, Phillips. Figures and Descript. of the Palaeozoic Fossils of Corn- 

 wall, Devon, and West Somerset, p. 90, pi. xxxv, fig. 165, 1811. 



Spec. Char. Shell ovate, as broad as, or longer than wide, contracted in front, widest 

 near the beak. Ventral valve deep and uniformly convex ; beak wide, rounded, and 

 much incurved ; foramen minute, contiguous to the umbone ; lateral ridges angular ; 

 forming well-marked curves on either side. Dorsal valve nearly flat, or slightly convex, 

 sometimes rather depressed in the middle and at the front ; surface smooth, marked only 

 by lines of growth. Proportions variable. 



Length 7, width 6, depth 4 lines. 

 f\ r » 3 



Pi r > ' 'i 



Obs. This Terebratula is remarkable on account of the great difference observable in 

 the respective convexity of its valves ; the dorsal one being perfectly flat in young 

 examples, and but slightly convex even in adult individuals, whilst at all ages the ventral 

 valve is deep and very convex. The shell is also characterised by a peculiarly shaped 

 beak, which looks as if it had been compressed so as to touch and overlie the umbone, 

 which leaves a flattened space between its angular beak-ridges and the hinge-line. The 

 interior is unknown, but the loop was in all probability short and simple. 



T. juvenis abounds in the limestone of the Middle Devonian of Barton and Lummaton, 

 near Torquay. The original type described by Sowerby was derived from similar beds 

 near Plymouth, and is now preserved in the museum of the Geological Society of London. 



Terebratula? Newtoniensis, Lav. PL I, figs. 1G, 17. 



Spec. Char. Shell slightly pentagonal, valves almost equally deep, and moderately 

 convex, depressed or flattened along the middle near the front ; beak not very prominent, 



