﻿CONCLUSION. 121 



Pengelly, Salter, and others), to be a little older than the Manvood and Barnstaple series ; 

 and in his paper already quoted, Mr. Salter mentions that he feels disposed to view 

 the red band of the Morte series, Zone III of the North Devon section, as an equivalent 

 of the beds about Launceston and Petherwin. The following is a list of the Brachiopoda 

 I have been able to recognise from the Landlake or Petherwin beds, and which will agree 

 with the one already published by Mr. Salter : 



1. Athyris concentrica. In Mr. Pengelly's Collection. 



2. Spirifera Verneuilii= disjuncta= Barumensis = gigantea, &c. 



3. — Urii = unguiculus. 1 

 ?4. — lineata. I have not seen this fossil; it is given here from Mr. Salter's list. 



?5. — bisulcata. From Mr. Salter's list. 

 C. Atrypa reticularis, vel A. desquamata ? 



7. Rhynchonella pleurodon. 



8. — pugnus. 



?9. — subdentata. From Mr. Salter's list. I have doubts as to the specific value of this 



so-called species. 



?10. Camarophoria (globulina ?) rhomboidea, Phillips. From Mr. Salter's list. 



11. Orthis striatula, vel resupinata. 



12. — interlineata. Very good impressions are met with at Petherwin. 



13. Streptorhynchus crenistria. 



14. Strophalosia productoides — caperata (rare), and var. membranacea. 



15. Productus subacideatus = fragaria. Said to be abundant. 



From the above it will be seen that out of these fifteen species, nine occur in the 

 Marwood and Barnstaple beds ; and as the existence of two or three others of the list 

 have not been identified with certainty, the palseontological difference, as to the Brachiopoda, 

 between the Petherwin and the Barnstaple beds would be small. We may, however, 

 notice the rare occurrence of Strophalosia productoides together with abundance of Prod, 

 subacideatus in these Cornwall beds, which is just what we find to be the case in the 

 Upper Devonian beds of Ferques in the Boulonnais, where Stroph. productoides is very 

 rare, while Prod, subacideatus 'is very abundant. Here we also find Atrypa reticularis, a 

 shell not yet discovered in the Marwood and Pilton beds. Mr. Salter would therefore 

 look upon these Landlake or Petherwin beds as the equivalents of the " Clymenien-Kalk " 

 of the Prussian geologists, as well as of the red shales of Morte Bay. Mr. Pengelly is of 

 opinion that there exist no beds of the Upper Devonian age in South Devon ; but in 

 Cornwall we may mention Tintagel, where Sp. Verneuilii abounds, but in a flattened state, . 

 and much distorted from the effects of cleavage. 



Q 



