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BRITISH DEVONIAN BRACHIOPODA. 



numerous alternating beds, sandstone, clay, slate, limestone, and shale, more or less fossili- 

 ferous." Mr. Valpy having kindly forwarded for my examination at various intervals a 

 considerable number of the Brachiopoda he had been able to collect from the Ufracombe 

 group : I now append a list of those that I have been able to identify. 



1. Strvngocephalus Burtini. 

 12. Rensselceria stringiceps, var. ? A shell allied to that species was found by Mr. Valpy in a 

 calcareo-siliceous bed on the Hagginton Beach. 



3. Athyris concentrica. 



4. Merista plebeia. The specimens were very imperfect. 



5. Spirifera Yerneuilii, Murch. = disjuncta, Sow. 



6. — sp. ? Too imperfect for accurate determination. 



7. — speciosa. Imperfect specimens. 



8. — mida. 



9. — curvata, approaching to Sp. glabra. 



10. C'yrtina heteroclita. 



11. Atrypa reticularis, et var. aspera. 



12. llhynchonella pleurodon. 



13. — pugnus. 



14. Strophomena analoga. 



15. Streptorhynchus vmhracidum vel crenistria. 



16. Orthis striatula. 



Besides these, of which I have examined specimens, Mr. Valpy has found fragments 

 which he thinks might perhaps be referable to Atrypa desquamata, OrtMs interlineata, and 

 Calccola sanded ina ? 



We have therefore in this Ufracombe group a well-characterised Middle Devonian 

 formation, which may be almost considered on a parallel with those of the Torquay, 

 Newton, and Plymouth districts, but with this difference, that in the last named, and in 

 other similar localities, the species are more numerous, and the shell itself preserved. 



Zone III. It appears to be difficult to exactly determine the line dividing Zone II 

 from Zone III ; but on examining the section of the North Devon coast given by 

 De la Beche, it would appear that his Morthoe group commences apparently about a 

 quarter of a mile east of Lee, and it is immediately here that several greenstone dykes 

 appear, the only ones known on the coast. If this point be the separation between the 

 two groups, a line drawn from it about east-south-east would exactly cut through the olive 

 and cream-coloured shaley beds worked for building-purposes on both sides of the town, 

 and would leave the clay-slate with its associated sand and limestone beds within the 

 Ufracombe group, so that a line running through all the quarries of this shale, at Slade, 

 Wharnscombe, and Woolscot, would indicate the commencement of the Morte zone, 

 which would extend along the coast as far as Woolacombc, or about to the middle of 

 Morte Bay. This zone is chiefly composed of slates and shales supposed to be destitute 



