SEA-FISHERIES LABORATORY. 255 



AN INTENSIVE STUDY OF THE MARINE 

 PLANKTON AROUND THE SOUTH END OE 

 THE ISLE OE MAN.— PART III. 



By W. A. Herdman, F.R.S., Andrew Scott, A.L.S., and 

 W. J. Dakin, M.Sc. 



[Explanatory Note. — The work was carried on in 

 1909 very much on the same lines as in the two previous 

 years. The same localities were fished, and the same nets 

 were used, with the addition of a few improved forms to 

 be discussed below. Mr. W. Riddell again gave most 

 efficient help in the operations at sea, and Mr. Scott and 

 I have divided the work of preparing this report in 

 exactly the manner that was stated in last year's Intro- 

 ductory Note. Mr. W. J. Dakin (now Demonstrator of 

 Zoology in the University of Belfast), while working at 

 Port Erin as " 1851 " Exhibitioner in Zoology of the 

 University of Liverpool, in April, 1909, took entire charge 

 of our hydrographic observations at sea, and of the 

 subsequent working up of these in the laboratory. When 

 I had to return to Liverpool, in May, Mr. Dakin continued 

 both the planktonic and the hydrographic observations 

 with some of our nets and instruments, but according to 

 a modified scheme, taking samples twice a week during 

 the greater part of the summer. As this portion of the 

 work, although planned under my direction, was carried 

 out wholly by Mr. Dakin, Mr. Scott and I invited him to 

 join us as part-author of this report, and consequently the 

 section on hydrographic results has been drawn up by 

 Mr. Dakin, and he has also helped me in some of the other 

 sections. 



