- Geographical Distribution of Crustacea. A1 
rendering such a transfer impossible; and the passage farther 
south to the Canaries of several of the species is not beyond 
what this cause might accomplish. Still, it cannot be asserted - 
that in all instances the distribution here is owing to migration ;- 
nor will it be admitted unless other facts throw the Welt oí ^ 
probability on that side. t 
IX. But when we find the same ''emperate zone species oC- 
. eurring in distant provinces, these provinces having between ^. 
Frigid zone, and offering no ground for the supposition that such - 
a communication has existed during the recent epoch, we are led 
to deny the agency of voluntary or involuntary migration in pro- 
dueing this dissemination. An example of this, beyond all dis- 
pute, is that of the Mediterranean Sea and Japan. No water 
communication for the passage of species can be imagined. An 
| opening into the Red Sea is the only possible point of intercom- 
| munication between the two kingdoms; but this opens into the 
| 'Porrid zone, in no part of which are the. species found. "T'he 
| two regions have their peculiarities and their striking resemblan- 
| ces; and we are forced to attribute them to original creation and 
not intercommunieation. : : 
X. 'l'he resemblances found are not merely in the existence 
of a few identical species. 'l'here are genera common to the 
two seas that occur nowhere else in the Oriental kingdom, as 
|. Latreillio, Ephyra, Sicyonia, &c. ; and species where not iden- E 
||. tical have an exceedingly close resemblance. | 
| Now this resemblance in genera and species (without exact 
| identity in the latter) is not explained by supposing a possible - 
| intercommunication. But we may reasonably account for it on 
E the ground of a similarity in the temperature and other physical 
H 
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|| 
I 
conditions of the seas; and the well-known principle of * lik 
causes, like effects" forces itself upon the mind as fully meetit 
^Xhe case. Mere intercommunication could not produce the re- 
sem blance ; for just this similarity of physical condition would 
stil ill be necessary. And where such a similarity exists, creative 
E may multiply analogous species; we should almost say, 
must, for, as species are made for the cireumstances in which 
they are to live, identical cireumstances will necessarily imply 
identity of genera in a given class, and even of specific SE 
or of subgenera. 
| If, then, the similarity in the characters of these regions is the 
| occasion of the identity of genera, and of the very close likeness 
|! in certain species (so close that an identity is sometimes strongly 
| suspected where not admitted), we must conclude that there is a 
| possibility of actual identity of species, through original: creation. 
This, in fact, becomes the only admissible view, and the actually 
identical species. pA Japan and the Mec are ex- 
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them no water communication except through the "l'orrid | DE S Wr 
