Dr. A. Vaughan — The Lower Culm of North Devon. 531 



it is examined lie 100 miles apart, as in the case of Tenby and 

 the Mendips. 



(The detailed demonstration of this fact is fully set out in 

 a torthcoining paper, of which an abstract has already been 

 published. 1 From this abstract it is only necessary to extract the 

 following information : The Gleistopora zone is succeeded by the 

 Zaphrentis zone, and the Zaphrentis zone by the laminosa subzone, 

 and these three zones make up the Tournaisian or lower division 

 of the Carboniferous Limestone.) 



I am much indebted to Mr. J. Q. Hamling, F.G.S., of Barnstaple, 

 for his kindness in sending me, for examination at my leisure, 

 the Brachiopods and Corals which he has collected from Coddon 

 Hill and neighbouring localities. These specimens are mostly 

 casts, but this character increases rather than lessens the certainty 

 of their determination. The arrangement of the muscular scars 

 in the Brachiopods and the grouping of the septa, the nature 

 of the fossula, and the cystoid tabulae of the Zaphrentes are 

 beautifully shown in many of the specimens, I have also been 

 able to compare Mr. Hamling's specimens with a large series of 

 very similar casts collected by myself at Undy (about two miles 

 west of Severn Tunnel Junction), where a similar faunal assemblage 

 is to be found. 



The results of my examination are as follows : — 



Coddon Hill and Landkey. South of South Aller ; 



CJwnetes Sardrensis,^ vars. Nouth-west of South Molton. 



Leptena analoga. Cleiothyris Reyssii (mut. j8). 



Rhipidomella HicheUni. Ghonetes Hardrensis,- var. 



Cleiothyris glabristria. Spirifer aff. clathratus. 

 Orbiculoidea, sp. 

 Zaphrentis aff. Fhillipsi. 



All the specimens from which the above lists are drawn up are 

 not merely similar, but are actual duplicates of forms which occur 

 in the neighbouring areas at the horizons to which I. assign the beds ; 

 hence the deductions here drawn require no effort of pateontological 

 subtilty. 



In the surrounding area every one of the above fossils to 

 which I have assigned a specific name (i.e. with the exception of 

 Orbiculoidea) is confined to the Tournaisian, and does not occur in any 

 higher beds. 



I further deduce from the above faunal lists that the Coddon Hill 

 Beds belong certainly to the Zaphrentis zone, but that those near 

 South Molton lie at a somewhat lower level, and may be either 

 upper Gleistopora zone or the lowest part of the Zaphrentis zone. 

 Assuming, then, that the Posidonomya shales lie immediately 

 above the Coddon Hill Beds (a fact of which both Dr. Hind and 

 Mr. Hamling are convinced), my conclusions seem to be in agreement 



1 Abstract of Proc. Geol. See, June Sth, 1904. 



* Hardrensis is merely used as a connotative term, and for this purpose it is 

 preferable to laguessiana, which implies a particular member of the cu'culus. 



