544 DR. G. H. FOWLER ON THE [June 21, 



perfect antennae agree with this description. JN"or, curiously enough., 

 does Giesbrecht's own exquisitely drawn figure (pi. vi. fig. 6, 

 Pelagischen Copepoden des Golfes von Neapel &c.) bear it out. 



Giesbrecht's grounds for making this a distinct species from 

 C. finmarcliicus, and not a mere variety, seem to me scarcely 

 adequate. It is extremely likely that a species so widespread and 

 living under so varied conditions should possess corresponding 

 modifications such as we find here. 



The very remarkable occurrence of three specimens of Argulus 

 foliaceus in 15 d gathering is phenomenal ; this species, so far as I 

 am aware, having never been previously recorded except from fresh 

 water, in which it is commonly found parasitic upon the stickleback, 

 carp, and other fish. In this instance it appears to have been 

 taken by the tow-net as a free-swimmer ; and the only conclusion 

 I can come to is that these three specimens became detached from 

 a fish which had recently found its way into the sea from some 

 stream, They in all particulars agree with A. foliaceus, differing 

 markedly from any of the known marine species of Argulus. 



[Notes to Table of Distribution. 



(1) Stations 11 to 19, 1896. Station 20, 1897. 



(2) The temperatures given for Station 20, hauls a to d, were not actually 

 observed there, but are taken from the serial observations at Station 16 ; 

 the difference between the two is probably trifling. The serial tempera- 

 tures of the 1896 cruise are published in the Report of Proceedings &c. 

 in the Faeroe Channel made by Capt. W. U. Moore, R.N., to the Hydro- 

 graphic Office in 1896. 



(3) For the reason of the exclusion of Calanus hyperboreus from the table 



see p. 541. 



(4) VA=Very abundant. = Common. 



A = Abundant. F=Few. 



S= Scarce. 



G. H. F.] 



Appendix to the foregoing Report. By G. HERBERT 

 FOWLER, B.A., Ph.D., Assistant Professor of Zoology 

 in University College, London. 



Mr. Thompson's Eeport brings out some very interesting 

 features, from the oceanographic standpoint, with regard to the 

 distribution and bionomics of Copepoda. The most salient 

 feature is, as he points out, the apparent indifference of Calanus 

 finmarchicus to temperature and pressure. Like Spadella 

 (Krohnia) hamata, discussed for the Faeroe Channel in an earlier 

 paper of this series 1 , and on a wider basis by Steinhaus 2 and 

 Chun 3 , it is apparently equally happy whether at the surface under 



1 G. H. Fowler : Proc. Zool. Soc. 1896, p. 993. 



2 O. Steinhaus : Verbreitnng der Chsetognathen ; Inaug. Dissert., Kiel, 1896. 

 8vo. 



3 0. Chun : Beziehungen zwischen dem arktischen und antarktischen 

 Plankton. Stuttgart, 1897. 



