vf the FisliGvij Board for Scotland. 



201 



— viz., twice for Station T. in July, and once for Stations V. and VIII. 

 in September. They are described as abundant in four of the records for 

 1891 — viz., once for Station VIII. in May, once for Stations III. and IX. 

 in July, and once for Station I. in August. They are recorded as abun- 

 dant three times in 1892 — once for each of the three Stations V., VIII., 

 and IX. in September. Young Crustacea are described as abundant hve 

 times in 1893, once for Station I. and twice for Station III. in July, 

 and also twice for Station V. in June. In 1894 there are over twenty 

 records of young Crustacea, but in none are they described as abundant 

 unless the three April records of young Balani (for Stations I., III., and 

 IV.) be counted. On the contrary, in 1895 young Crustacea are described 

 as abundant no fewer than twelve times, once at each of the three outer 

 stations (V., VIII., and IX.) in April, once at Stations III. and V. in 

 August, once at vStations I., III., and VIII. in September, and once at 

 Stations I., III., and IV. in October — thus indicating that, notwithstand- 

 ing the difference in the number of records when compared with those 

 for 1891, 1892, or 1893, young Crustacea were locally more plentiful in 

 the estuary and its vicinity in 1895 than during the other three years 

 referred to. 



The number of separate records of young Schizopoda is thirty-two for 

 the seven years, and their distribution is indicated by the following three 

 formulae : — 



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

 of the stations : — 



Number of the Stations, I. III. IV. V. VIII. IX. 



Total number of Records for each Station, - - 12 4 0 3 7 6 



Formula (2) shows the total number of records of Schizopoda for each 

 of the twelve months : — 



Names of the Months, arQ^*'g^Si?&b-S,->i>d 



Total number of Records for each Month, - - 00 2 643244511 



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

 of the seven years : — 



Numbers of the Years, . . . - 1889. 1890. 1891. 1892. 1893. 1894. 1895. 

 Total number of Records for each Year, - 5 16 6 1 4 0 0 



The separate records of young Balani number fifty-eight. These larval 

 Crustaceans are described as abundant in 1891 at Station I. in April, and 

 in 1892 at Station III. in April. In 1893 they appear to have been 

 plentiful at the inner stations, and are described as abundant in a surface 

 tow-net gathering at Station I. in April, in the bottom tow-net at 

 Station III. in June, and in a surface tow-net gathering at Station IV. in 

 April. In 1894 young Balani are described as abundant in the bottom 

 tow-net gatherings collected at Stations I., III., and IV. in April. In all 

 the other records of these immature Crustaceans they are either described 

 as common or few. Their distribution is indicated by the following three 

 formulae : — 



Formula (1) shows the total number of records of young Balani for 

 each of the six stations : — 



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



Total number of Records for each Station, - - 12 12 17 3 8 6 



This formula shows that young Balani were, as might be expected, more 

 numerous at the three inner stations, and that the highest number of 



