258 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



distributed by this time all through the water around the 

 Calf Island. The following day, the species was present 

 in nearly all the numerous nets worked at various depths 

 down to GO fathoms in mid- channel ; and it then reached 

 its climax in numbers, 2,000 in the net at 10 fathoms 

 and 2,500 in an open tow-net attached to the shear-net 

 at 20 fathoms. For some days after this Microcalanus 

 was not taken in any of the nets, and then on September 

 21st it turned up for the first time in the surface 

 gatherings taken across Port Erin Bay. It was present 

 in these bay gatherings on October 1st (35) and 24th 

 (100), November 8th (100), December 20th (80) and 23rd 

 (50), and finally January 8th (50 specimens). 



This record looks like the immigration of an oceanic 

 species up the deep water of the mid-channel between the 

 Isle of Man and Ireland, and then its gradual spread in 

 late autumn into the shallower inshore waters and finally 

 to the surface of the bay, where it remained throughout 

 the winter. 



CENTROrAGES AND TEMORA. 



In the Blue-book (Cd. 383T, 1907, p. 175) on the 

 International Fishery Investigations in the Southern Area 

 during 1904-5, issued under the direction of the Marine 

 Biological Association, the statement is made in regard 

 to Centropages hamatus (Lilljeb.) that " in the Irish Sea 

 it is a seasonal species occurring onty in the summer." 



We have no hesitation in saying, on the contrary, 

 that this Copepod occurs in the Irish Sea all the year 

 round. It is on our records for 1907 in every month, 

 and is practically continuously present from January 8th 

 to December 30th. The numbers are low at the beginning 

 of the year, but reach GOO in one haul of the surface net 

 by April 9th, and 1,300 on April 24th. Contrary to the 



