TRANSACTIONS OP THK SECTIONS. 



125 



The fossils recorded as occuning in tlie two areas are as shown in the following 

 Table. 



Table I. 



Zoophyta 



Echinodermata . . . 



Crustacea 



Bryozoa 



Bracliiopoda 



Lamellibranchiata 



Gasteropoda 



Cephalopoda . . . . 



Totals . . . 



Assuming the higher antiquity of the South Devon and contemporary beds, it 

 follows that the fossils common to it and Petherwin, or Barnstaple, or both, were 

 contributions from it to them. Kegarded thus, the populations of the two areas 

 were made up as below. 



Table U. 



By <' peculiar " is meant such species as, in England, are found in Pethermn or 

 Bai-nstaple only; "Common" marks those foimd in both, but not elsewhere in 

 British Devonian rocks; and "Carboniferous" is used to designate the species 

 common to deposits of that age and Pethei-win, or Barnstaple, or botli, exclusive 

 of six foimd also in Lower Devonian deposits. The " Carboniferous " figures in 

 Table II. are not in addition to the previous numbers ; the totals (72 and 76) are, 

 of coiu'se, complete without them. 



In order to show the relative value of the figures just given, the following Table 

 has been calculated on the method of putting each total (72 and 76) equal to 

 1000, and equating the figiues in Table II. to it. 



Table HI. 



A glance at the Table shows that, of the two, Pethei-win is the nearest to the 

 Lower Devonian horizon, and the most remote from the Cai-boniferous. 



The fossils of the two areas belong to forty-six genera, of which thirty-three are 

 represented by the Petherwin, and thii'ty-four by the Bai-nstaple series j twenty- 



