390 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



distributed species has been in winter. The species is 

 obviously a scarce one, which varies much in its 

 occurrence from year to year. 



The winter form, Eutevpina acutifrons , was obtained 

 in our nets from January (4,640 on the 4th) on, with 

 decreasing frequency, to May 2nd, and it appeared again 

 at the end of December. Isias clampes occurred from 

 May to November, with a maximum of 350 on 

 August 15th. These records agree in general with those 

 of previous years. 



The monthly average hauls in Port Erin Bay for 

 the eight more important species of Copepoda are as 

 follows : — 







3 

 CI 



r e8 







eg 



® 



o 

 o 







3 



S3 





§ 



o 

 o 



"3 



3 



o 



s 



.2 



e6 



s 



"3 





o 



3 

 P 



a 



a 



o 



< 



e8 



o 



o 



J* 



Jan. 



5 



1,056 



4 











286 



1,987 



2,053 



Feb. 



4 



446 



4 











41 



1,978 



493 



Mar. 



7 



2,001 



96 



1 







111 



440 



111 



Apr. 



530 



1,060 



384 



17 



43 



410 



766 







May 



6,716 



11,899 



16,999 



342 



23 



10,850 



7,708 



274 



June 



459 



14,599 



2,191 



19 







20,390 



36,444 







July 



739 



4,987 



3,628 



61 







6,578 



16,404 



232 



Aug. 



12 



6,429 



409 



45 







1,899 



12,868 



10,146 



Sept. 



129 



4,027 



136 



61 



6 



6,148 



21,284 



14,363 



Oct. 



343 



30,866 



40 



18 







9,320 



23,864 



11,106 



Nov. 



47 



3,196 



11 



2 







584 



5,995 



4,241 



Dec. 



23 



2,288 















239 



2,655 



829 



Although the highest averages do not in most cases 

 coincide with those of the previous year, still the general 

 course of the separate species throughout the year is 

 fairly constant, and probably represents the normal. 



The following diagram (fig. 4) shows the curves of 

 the more important forms of Copepoda — the five most 

 abundant in the table given below. 



