PENGELLY ON THE DEVONIAN AGE OF THE WORLD. 



335 



f Cellulares 



< Monocotyledones ... 



(. Dicotyledones 



Amorphozoa 



Infusoria 



Foraminifera 



Zoophyta 



Entozoa 



Acalepha 



Echinodermata ... 



' Annelida 



Cirripedia 



Crustacea 



Myriopoda 



Arachnida 



Insecta 



Bryozoa 



Tunicata 



Brachiopoda 



Lamellibranchiata 



Pteropoda 



Gasteropoda 



Cephalopoda 



Pisces 



Keptilia 



Aves 



Mammalia 



Species. 



Genera. 



Living. 



Devonian. 



Brit. Dev. 



D.&C.Dev. 



Dev. Spe. 



Liv. Spe. 



Devonian. 



Brit. Dev. 



D.&C.Dey. 



9,100 



6 



1 







.7 



2 



1 





10,629 



49 









50 



19 







49,674 



















300 



11 



9 



9 





33 



6 



4 



4 



500 



















1,000 



















430 



81 



50 



49 



188 



23 



20 



20 



1,500 



















210 



















498 



82 



15 



15 



165 



18 



6 



"q 



770 



8 









10 



4 







107 



1 









9 



1 







681 



85 



12 



l\ 



124 



26 



9 



g 



200 



















600 



















65,000 



















380 



56 



11 



11 



147 



22 



"l 



"7 



71 



















48 



131 



109 



108 



2,729 



16 



17 



16 



2,413 



287 



50 



49 



119 



35 



18 



17 



62 



13 







210 



3 







8,822 



278 



47 



47 





32 



34 



14 



14 



128 



270 



48 



48 



2,109 



9 



5 



5 



8,000 



110 



91 







14 



47 



34 





1,055 



















7,000 



















2,030 



















171,211 



1,468 



443 



347 





265 



135 



97 



It appears, then, that all Devonian fossils are referrible to existing 

 classes; hence the organisms which long since passed into extinction, 

 and those which now exist, are parts of one whole ; and, so far as 

 these fossils testify, there are no extinct classes. Of the twenty- 

 seven classes into which the present fanna and flora of the world 

 are divided, fifteen are represented and twelve nnrepresented by the 

 Devonian series : * the latter are divisible into three groups, namely, 

 Minute groups, as infusoria and foraminifera ; Perishable, as entozoa, 

 acalephse, and others ; and Complex, as reptilia, aves, and mammalia. 

 It would be premature to assert that the first did not then exist. It 

 is a question for the microscopist ; and it may be doubted whether 

 his attention has been so far given to it as to warrant any definitive 

 opinion on it. Perishable forms can scarcely be hoped for in a fossil 

 state, but it is not easy to dispose of the negative evidence respecting 

 the Complex — the higher — organisms. True, that all the Devonian 

 beds with which we can be said to be well acquainted are of marine 



* Decotyledonous fossil plants have recently been found by Dr. Dawson in the 

 Devonian rocks of Canada. See Quart. Journ. Geol. Soc, vol. xv., page 484. 



