i8 



These data are as yet not sutlicient to throw much hght on 

 the habits of the crawfish, but some general conclusions may 

 be indicated. 



Males. 



A large number of males by themselves were found in 

 13 fathoms near Robben Island on the 2nd November. Most 

 of these still had their old shell, but some had moulted. On 

 the 6th of the same month a somewhat similar condition was 

 met with. 



Meanwhile in shallow water {2} fathoms) off Woodstock 

 Beach a small number of immature males were found together 

 with females. 



The first locality was visited again on the 13th November 

 and a smaller number of males were found, some still in the 

 old shell, some in the new, together with 4 mature females in 

 hard shell. 



The second locality (off Woodstock Beach) showed, as 

 before, small males together with females in berry. On the 

 12th, in 5 fathoms, in addition to small males, a number of 

 large males were present with mature and immature females. 

 Five days later conditions were somewhat similar, but only 

 •one large male was found. On the 7th January adult males 

 were got with berried females in about equal numbers. Later, 

 on the loth January, the adult males were much in excess 

 of the females (3 berried), and there was a marked absence 

 of small males. On the 14th and 21st no males were got ; 

 on the 28th, 2 large males and no females, and again on the 

 4th February large males but no females were found. 



It would appear from this that the large males had retreated 

 to deep water (13 fathoms) and there cast their shell, the 

 smaller males in the meanwhile being in shallow water with 

 the berried females. Later on, the large males with new shell, 

 appeared in the shallow water apparently driving off the small 

 forms and adult females. It will be seen by glancing over 

 the schedules that very seldom are adult males procured 

 together with young forms. That the larger fish dri\-e off the 

 smaller is also indicated by the fact that it has been observed 

 that in fishing operations the smaller fish are at first got and 

 a little later only large fish. The behaviour of the animals 

 in the tanks also confirm this, as it was often observed that, 

 although the small crawfish could by their superior agihty, 

 and apparently keener sensory organs, first detect the bait 

 and make off with it, yet they were no match for the heavier 

 and stronger adults in the struggle for possession of food. 



