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BRITISH DEVONIAN BRACHIOPODA. 



In these same North Devon grits occur many undeterminable casts and impressions, 

 out of which several so-termed species have been proposed, but some of these are evidently 

 referable to Sir. crenistria or Str. umbraculum ; but as I cannot venture to express any 

 decided opinion from such imperfect material, I will content myself by simply recording 

 their presence, and reproducing the original figures published by their respective 

 makers. 



A. Strept. ? compressus, Phillips. PI. XVIII, figs. 7, 8, 9. 



Orthis compkessa, Phillips. Pal. Foss., p. 66, pi. xxv, fig. 112 — «.*>*.*'./ 1841. 



The imperfect and incomplete casts and impressions referred by Phillips to 0. com- 

 pressa, Sovverby ('Sil. Syst.,' pi. xxii, fig. 12), appear referable to two distinct species, 

 hut in no case to 0. compressa of the 'Silurian System.' Phillips's fig. 112 a (fig. 8 of 

 my Plate) may perhaps belong to Chonetes Hardrensis, while some of the others, and in 

 particular his fig. 112 e (fig. 7 of my Plate) (of which the original example is in the 

 collection of the Geological Society), is evidently a cast of Strept. crenistria. The so- 

 termed 0. compressa, Phillips, will therefore have to be erased from the list of British 

 Devonian species. 



B. Strept. calcar, Phillips. PI. XVII, fig. 11. 



Orthis calcar, Phillips. Pal. Foss., p. 230, pi. lviii, fig. 112** (upper figure), 1841. 



This looks like the cast of a young specimen of Str. crenistria. Loc. Upper Devonian. 

 Pilton. 



C. Strept. ? semicircularis, Phillips. PI. XVIII, fig. 10. 



Orthis — Phillips. Pal. Foss., p. 65, pi. lviii, fig. 112* (lower 



figure), 1841. 



This impression or internal cast is so very imperfect, that I cannot venture upon any 

 positive identification or opinion. It is referred by Phillips to Orthis semicircularis; 

 Sow. (' Sil. Syst.,' pi. xxi, fig. 7). Professor Phillips states to have found one specimen 

 only at Pilton, in North Devon. 



D. Strept.? plicata, Sow. PI. XVIII, fig. 12. 



Orthis — Sow. Trans. Geol. Soc, 2nd ser., vol. v, pi. liii, fig. 10, 1840. 



I am very uncertain with reference to this so-termed species, which is founded on 

 one specimen of an obscure small internal cast of a single valve which Sowerby describes 

 as " transversely elongated, depressed, plaited ; plaits numerous, sharp ; width twice the 

 length. Loc. Barnstaple, North Devon." At page 04 of his ' Pal. Foss. of Devon, 



