14 



The results therefore are practically the same as before. It 

 will be seen from the accompanying table that with one exception, 

 which will be referred to presently, the females had migrated 

 northwards; one, No. 172, having actually got as far as Gardens- 

 town. Banff (Moray Firth), where it was caught on June 23rd after 

 an absence of 8 J months. 



It has been clear during the course of these experiments that 

 there has been a great deal of variation with respect to the migration 

 of the females. All the females do not migrate. During the period 

 that females are being returned to us from northern fishing ports, 

 others are also being caught at Beadnell. And while it is true that 

 the first recaptures of the migratory females are made in the Berwick 

 district, afterwards our marked crabs are still being caught in that 

 district at the time that stragglers, so to speak, are being caught 

 off the coast of Kincardineshire. On the south side of the Forth 

 recaptures were made in every month from November to June and 

 it may be noted here that they are still being made in July. 

 One was caught off Cellardyke (Fife) in April, another off Catterline 

 in May, and one off Bervie in June. It was also in June, as has been 

 stated, that the recapture was made at Gardenstown. At Beadnell, 

 during the whole period, females have been recaptured along with 

 the non-migratory males. In one case, No. 242, the crab was re- 

 captured in November, liberated, and caught a second time on the 

 Beadnell ground in March, again liberated, and afterwards recap- 

 tured hi April. No. 262 was caught twice in the months February 

 and April. Nos. 455 and 460 have a similar history, although the 

 former and a number of others caught several miles to the 

 north of Beadnell, may be said to point to a possible late migration 

 of the females to the north. It is plain, therefore, that a large 

 number of females do not migrate, or rather did not migrate up to 

 the time of their recapture. They were more than probably females 

 which were not to become 4i berried " this year. 



The present experiment is interesting from the light it throws 

 on the rapidity of migration. No. 358 reached 2 miles E.N.E. of 

 Berwick, a distance of 18 miles, by February 5th, on winch date it 

 was captured after being free three months, Others were got in the 

 neighbourhood of Berwick in March, April and May, after absences 

 of four to six months. No. 30 reached Burnmouth (24 miles) on 

 January 22nd after a free period of 3| months. No. 157 was 



