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BRITISH DEVONIAN BRACHIOPODA. 



Besides these twenty-one species, Mr. Salter mentions Sp. laminosa ; and some obscure 

 fragments have been supposed referable to Bh. pugnus. The rock near Marwood and 

 Barnstaple is very rotten, and consequently the casts are generally imperfect ; but 

 near Braunton it is more compact, and consequently the casts and impressions are at times 

 better preserved. 



Prof. Phillips describes Brushford, near Dulverton, in West Somerset, as the east 

 end of the Pilton beds, where he states the following species to have been found: — Sp. 

 microgemma, Sp. decussata, Sp. unguicula {Urii), Sp. obliterata, Sp. mesomala, Sp. megaloba, 

 Orthis plicala, 0. parallela, and Prod, scabriculus. Thanks to the kindness of the Rev. 

 P. Mules, I have also been able to examine a good many specimens of fossiliferous 

 rock and fossils from the neighbourhood of Brushford, and which I found to agree exactly 

 with those already described from the Marwood and Pilton beds of North Devon. 



The following is the list of the species I have been able to identify from these 

 Brushford beds : 



1. Terehratula sacculus. 



2. Spirifera Verneuilii vel disjuncta. 



3. — Urii. 



4. — cristata, var. octoplicata. 



5. Rhynchonella pleurodon. 



6. Streptorhynchas crenistria. 



7. Orthis interlineata. 



8. Ckonetes Hardrensis. 



9. Strophalosia productoides, vel caperatu. 



10. Productus prcclongus. 



11. — scabriculus. 



And now, to conclude the little we have thought necessary to say in connection with 

 North Devon, we will quote from Mr. Salter's paper the following passage (p. 482) : — 

 " It is extremely difficult to say precisely where the Pilton group ends and this group of 

 shales (the Carboniferous) begins ; but the absence of sandstone-bands and the presence 

 of only Carboniferous species show sufficiently the reality of the change. Strophalosia 

 ecaprata, var. membranacea is occasionally present, but not the ordinary variety. It is asso- 

 ciated with Spirifer taminosus, Sp. cuspidatus, StreptorJigncItus crenistria, Ckonetes Har- 

 drensis, Atltyris Rogssii, Bellerophon decussatus, Product us cost at us, P. Martini, Orthis 

 Michetini, Venus parallela, Phillips, Spirifer ovalis (small), Sp. bisulcatus, Phittipsia 

 seminifera, and many others. But these are enough to show that we have passed from 

 the sandy Pilton group to the true Carboniferous slate." 



We will now add a few words on those beds which as to age would be interme- 

 diate between the upper beds of the Middle Devonian and the Marwood series. These 

 beds occur at Landlake, parish of South Petherwin in Cornwall, 1 and are considered by 

 some geologists and palaeontologists (among whom we may quote Messrs. Murchison, 



1 Landlake is in Cornwall, and will be found in Sheet xxv of the ' Ordnance Survey Map,' a short 

 mile due east of South Petherwin, and barely two miles south of Launceston. It is, I believe, in the 

 parish of South Petherwin, and is the chief fossil locality in the district. In the writings of geologists 

 Landlake and South Petherwin are synonyms. There are no fossils in the latter place. 



