of the Fishery Board for Scotland. 185 



that the station with the highest number of records of Temora and 

 Calanus is the same — viz., Station V. Bat the Table shows a slight 

 diversity in the distribution of Temora throughout the different months 

 of the year as compared with that of Calanus. Thus, the maxima of 

 monthly records are found in April and May, that for May being dis- 

 tinctly higher than that for April, and the minima in January, February, 

 March, and December ; while in regard to Calanus the maximum number 

 is that for April, while the number for February is smaller than the maxi- 

 mum by only five records. These points are more clearly indicated in 

 the annexed formulae. 



Formula (1) shows the total number of records of Temora for each 

 station for all the seven years : — 



(a) Inner Stations. (b) Outer Stations. 



Numbers of the Stations, - I. III. IV. > V. VIII. IX. 



Total number of Records for each Station, - 43 44 38 49 43 43 



Formida (2) shows the total number of records of Temora for each of 

 the twelve months, (a) for the inner stations, (b) for the outer stations, 

 and (c) for all the six stations : — 



Names of the Months, 



Total number of f f"> ^ ^ ni ! er g tat * 0n J " 

 Records for eachi W the 0uter Statlons > " 



.(c) all the Six Stations, - 1 10 12 48 54 28 17 27 20 22 15 6 



Month, for I . 



1-5 



1-2 

 a) 









3 



•-3 



>> 



1-3 



< 



Sept 

 Oct. 



> 



o 



o 



1 



6 



4 



27 



28 



15 



7 



8 



4 12 



9 



4 







i 



8 



21 



26 



13 



10 



19 



16 10 



6 



2 



889. 



1890. 



1891. 



1892. 



1893. 



1894. 



1895. 



7 



23 



28 



25 



17 



6 



19 



13 



36 



31 



24 



17 



5 



9 



In the distribution of Calanus the month that shows the smallest 

 number of records is September, but in the case of Temora the smallest 

 number is that for January, and the pruportional difference between the 

 lowest and highest number of records is considerably greater for Temora^ 

 than for Calanus. 



Formula (3) shows the total number of records of Temora for each of 

 the seven years, (a) for the inner stations, I., III., and IV. ; (b) for the 

 outer stations, V., VIII. , and IX. ; and (c) for all the six stations : — 



Numbers of the Years, - 



Total number of f,g) £ e nT" ^ & f 0US > 

 Records for eadhj (6) the 0uter Statl0ns ' 



Year, for (^( c ) all the Six Stations, - 20 59 49 34 11 



There seems to be a greater variation in the total numbers for the years 

 in the distribution of Temora than is the case with Calanus. The above 

 formula shows that in the case of Temora the highest total number of 

 yearly records is fully five times greater than the lowest, but in Calanus 

 the difference is less than three times ; and further, the yearly maxima for 

 Temora occur in 1890 and 1891, and in 1891 and 1892 for Calanus. 

 The total number of records for Temora for the six stations during the 

 seven years is two hundred and sixty. 



Acartia SP. 



The next Table shows the distribution of Acartia sp.,* in a manner 

 similar to that of Calanus and Temora. 



* Careful examination is necessary in order to distinguish the species of Acartia, and 

 for various reasons it was not always possible to carry out a minute and sufficiently careful 

 examination of doubtful species on board ship ; therefore the specimens of Acartia 

 observed were frequently recorded merely under their generic name. 



