PENOELLY — JFOSSILS OF DEY0:N^ AND CORNWALL, 
29 
Petherwin appears to have been richer than Barnstaple in Zoo- 
phyta and Cephalopoda, but poorer in Echinodermata and Lamelli- 
branchiata ; whilst neither of the areas has yielded any fossil 
sponges. 
Assuming the higlier antiquity of the South Devon and contempo- 
rary beds — to which, probably, no geologist will object — it follows 
that the fossils common to it and Petherwin, or Barnstaple, or both, 
were contributions from it to them. Regarded thus, the populations 
of the two areas were made up as is shown below. 
TABLE X. 
Pkthekwin. 
Baknstaple. 
Sp. 1 
Sp. 1 
„ 15 
„ 13 
New (peculiar) 
„ 44 
„ 50 
New (common) 
„ 12 
„ 12 
„ 13 
„ 16 
The term " peculiar," in the table, is meant to denote such species 
as, in England, are found in Petherwin or Barnstaple only ; and 
"common" to mark those found in both, but not elsewhere in the 
British Isles ; " carboniferous " is used to designate the species 
common to the deposits of that age and Petherwin, or Barnstaple, or 
both ; exclusive of six found also in Lower Devonian deposits. It 
may be remarked here that no fossil occurring in South Devon, Pe- 
therwin and Barnstaple, appears to have been found in Carboniferous 
rocks. 
The Carboniferous figures 13 and 16 in Table X. are not in 
addition to the previous numbers in the Table ; the totals — 72 and 
76 respectively — are, of course, complete without them. 
In order to show the relative value of tlie figures just given, the 
follow^ing Table has been calculated on the method of putting each 
total 72 and 76 equal to 1000, and equating the other figures 
in Table X. to it. It should be remembered, however, that whilst 
this furnishes better data for comparison, it considerably magnifies 
the facts. 
TABLE XL 
Petheewin-. 
Baenstaple. 
Sp. 14 
Sp. 13 
„ 208 
„ 171 
„ 611 
„ 658 
New (common) 
„ 167 
„ 158 
181 
„ 211 
The Siluri m figures are, of course, quite valueless further than as 
