11^ 



Head, 1 on the north coast, and 1 on the west coast, oft" Cape Wrath. The 

 female had gone a distance of 107 miles, to a position north-east of Kinnaird Head. 



Maturity. • 



Males. — Of thfe 29 males which were of adult size on recapture, the condition 

 of the testes was ascertained in 24. One was " ripe " ; it was taken on 13th 

 February 1912, after 155 days, 57 miles to the north, a little north and east of 

 A.berdeen, the mean rate of travel having been 3-7 miles. 



Seven were " nearly ripe," viz. 1 taken in October 1911, 6 miles to the south 

 and west ; another on 13th December 1911, 20 miles north and west ; a third 

 on 26th December, 12 miles north and west ; the fourth on 13th February, on 

 the north coast, 188 miles distant ; the fifth on 14th March 1912, 71 miles north 

 and east ; the sixth in April 1912, at a position unspecified ; and the seventh 

 in October 1912, 31 miles north and east. 



Three of the males were " spent," all got to the north, 2 off the coast of Aberdeen, 

 64 and 44 miles distant, in April and June 1912 respectively, and the third west 

 of Cape Wrath, 238 miles distant, in April 1912. 



In 5 the testes were " maturing " ; 1, caught in February 1912, in the Moray 

 Firth, 155 miles distant, was described as three-quarters ripe. Two, caught in 

 October 1911, 2 and 6 miles to the northwards, were " fully half ripe " ; 1, takeii 

 in October 1912, also " half ripe," was caught 101 miles north alid east ; a third, 

 " nearly half ripe," was caught in September 10 miles to the south and we.st. 



Eight were " immature," but particulars about only 5 of them were obtained ; 

 they were caught in the months May, June, September, October, and December, 

 at distances of from 2 to 32 miles distant. 



Females. — Of 16 adult females, the condition of the ovaries was obtained in 

 13. None Was " ripe " ; 1 was " nearly ripe," and was caught in December 

 8 miles to the south and west. 



Two were " maturing " ; 1 was caught in February 53 miles to the north and 

 east ; particulars regarding the other 1 were not given. 



Ten were " immature " ; of 1 of these, caught in April, particulars were not 

 obtained ; 2 were caught in December, each 5 miles to the south and west ; 3 

 were taken in June, all north and east, for distances of 25, 43, and 54 miles ; 1 

 was got in July, 81 miles north and east ; 1 in October, about which particulars 

 do not exist ; 1 in November, 4 miles to the south and west ; and 1 in January; 

 49 miles north and east. 



Of 18 females under the adult size on recapture, 1 was " nearly ripe." It 

 measured 37-37'4 cm., and was caught on 15th November, after 65 days, 5 miles 

 to the south-west ; 1, taken in February, 63 miles to the north and east, and 

 measuring 37-39 cm., was " fully half ripe." 



Thirteen were " immature " ; they were -caught as follows : — 1 in January, 

 3 in February, 1 in April, 2 in September, 2 in October, 2 in November, and 2 in 

 December. The position of recapture was ascertained for 11 of these females ; 

 3 were taken to the north and east, at distances of 10, 36, and 74 miles ; 4 were got 

 to the north and west, at distances of 11, 22, 22, and 26 miles ; 4 were caught south 

 and west, 3 at 5 miles, and the fourth at 26 miles, the latter in the Firth of Forth' 



EXPERIMENT VI. 



1th March 1912. 

 In this experiment the number of plaice marked and haberated was 100, the 

 males numbering 22, and the females 78. The sizes of the males ranged irom 



32 to 48*5 cm., and of the females from 31 to 60 cm. Five of the males were under 



33 cm. and 42 of the females under 38 cm., M'hen liberated. The numbers liberated 

 and recaptured, in 5-cm. groups, are shown in the accompanying table : — 



cm. cm. cm. cm.. cm. cm. Total. 



31-35-5 36-40-5 41-45-5 46-50-5 51-55-5 56-605 



F. Lib. . . 28 36 8 2 — 4 78 



F. Recap. . . 22 29 4 1 — 4 60 



M. Lib. . . 13 7 1 1 _ _ 22 



M. Recap. . . 8 3 1 i _ _ 13 



