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Show 50 Number of species, Paris London 1122 of which 38 are still living, and 1084 extinct (or unlmown). 239 of which 12 are still living, and 227 extinct (or unknown). Valognes Belgium By subtracting from these localities the n~1mber of analogous 332 49 1742 species • • · 5 04 The real number of species of this epoch is • · · 1238 The number of fossils of this period identified with living species is 4~, which is to 1238 in the proportion of 3t in 100. The numb~r of .fossil speCi·e S wh "l C h I1 ass from the Eocene into t.h e two ho thre r .p eriodsl 1s 46, that is to say, in nearly the same proportion as t e IVlng ana ogues. Among the fossil species, four only are common to the three epochs, which are the following:- 1 Dentalium coarctatum. 2 Tornatella inflata. 3 Bulimus terebellatus. 4 Corbula complanata. The 42 other fossil species, which go no farther than the Miocene epoch, are distributed in the following manner:- Bordeaux and Dax Turin Angers Ronca • Bordeaux, Dax and Touraine ib. ib. and Turin ib. ib. Touraine and Angers . ib. ib. Turin, Vienna and Baden · • ib. ib. • Touraine, Turin, Vienna and Angers ib. ib. · Touraine, Vienna, Angers and Baden • Turin and Ronca Angers and Ronca 17 3 2 7 4 i 2 ~ 1 42 Of the 42 living species, the following 13 are common to the three epochs,- 1 Dentalium entalis, 2 ---- strangulatum, 3 Fissurella grreca, 4 Bulla lignaria, 5 Rissoa cochlearella, 1 Murex tubifer, s Polymorphina gibba, 9 Triloculina oblonga, 1 o Lucina divaricata, 11 ---gibbosula, 6 Murex fistulosus, 12 Isocardia cor, 13 Nucula margaritacea. 51 . 0~ the ot~er species, 7 go no fal'ther than the Miocene epoch, and are d1str1buted m the following manner,- Dordeaux and Dax ib. ib. and Baden ib. ib. and Touraine _ib. _ib. and Angers • 1b. 1b. Touraine and Angers Total number of species in the three periods,In the Pliocene In the Miocene In 1he Eocene 777 1021 1238 3036 3 1 7 From the above lists it will appear that there are 17 species which are common to the three epochs, and which may therefore be said to characterise the entire tertiary formations of Europe. Thhteen of them are species still living, while four are only ]mown as fossil. There is not a single species common to the Pliocene and Eocene epochs which is not also found in the Miocene. GEOGRAPHICAL DISTRIBUTION OF THE LIVING SP.!WIES WHICH HAVE THEIR FOSSIL ANALOGUES. Pliocene Epoch, 350 species. In the Mediterranean In the Indian Ocean At Senegal . • . Common to the Mediterranean and Senegal . and the African Ocean ------ Indian Ocean and to Senegal and to America In the Northern European Ocean -- Pacific Ocean . 2~;1 5 Fossil in I!4f Sicily and Italy. 43} Fossil in 1 the Crag. 350 Miocene Epoch, 176 species, (100 species common to the p1·eceding epoch.) Species. At Senegal, of which 13 are common to the Indian Ocean, and 12 to the Mediterranean 79 In the Mediterranean and Southern European Ocean, of which 1 o are common to the Indian Ocean, and 12 to Senegal 86 In the Indian Ocean, 10 of which are comruon to the Southern European Ocean 29 Carried over 194 d 2 |