1897 - 98 .] Prof. D’Arcy W. Thompson on Marine Faunas. 349 
a common facies. We have seen that, as regards the fish, even 
such a likeness as this is certainly absent ; even such a likeness is 
explicitly denied by Ortmann for the Crustacea, and by Ludwig 
for the Holothurians ; nor do I myself, in the case of any other 
group, see signs of its existence. 
Note.— Since the above was written, I have read Mr I. C. 
Thompson’s paper on “ Antarctic Plankton ” in the Trans. 
Liverpool Biol. Soc ., vol. xii., 1898. Mr Thompson considers the 
common large Antarctic Calanus to he identical with the C. 
hyperboreus of the Arctic. But the latter is closely allied to, if 
not merely a large variety of G. finmarcliicus , which is known to 
occur off the Canaries in 30° 1ST. lat., as well as off Australia in 
37° S. lat., and which, according to Thompson, is also present in 
the Antarctic together with the genus hyperboreus ; it is therefore 
not “bipolar ” but cosmopolitan (cf. supra , p. 326). 
