PENGELLY ON THE DEVONIAN AGE OF THE WORLD. 
335 
^ Cellulares 
} Monocotyledones ... 
(. Dicotyledones 
f Amorphozoa 
Infusoria 
I Foraminifera 
<{ Zoophyta 
Entozoa 
Acalepha 
, Echinodermata ... 
J Annelida 
Cirripedia 
j Crustacea 
Myriopoda 
Arachnida 
Insecfca 
I Bryozoa 
Tanicata 
Brachiopoda 
L amellibrancliiata 
Pteropoda 
Oasteropoda 
Cephalopoda 
Pisces 
Reptilia 
Aves 
MammaKa 
Species. 
Genera. 
'3 
o 
> 
o 
p 
> 
. Spe. 
© 
Ph 
onian. 
. Dev. 
C.Dev. 
> 
© 
> 
=3 
p 
W 
p 
P 
P 
m ■ 
P. 
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 
6 
770 
8 
10 
4 
107 
1 
9 
1 
684 
85 
12 
11 
124 
26 
9 
8 
200 
600 
65,000 
380 
53 
11 
11 
147 
22 
"i 
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 fauna and flora of the world 
are divided, fifteen are represented and twelve unrepresented by the 
Devonian series : * the latter are divisible into three groups, namely, 
Minute groups, as infusoria and foraminifera ; Perishable, as entozoa, 
acalephiB, 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. 
