OBJECTS C AERIE D BY THE SEA-VRGHtN. 4 5 



Three Sea-Urchins of 23 mm., each weighing 8-0 gr. 



1 

 2 

 3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



9 pebbles 



13 ,, living Nassa 



13 ,, empty shell of T. cinerarius, 

 Sea-Urchin of 10 mm 



1 pebble, empty shell of T. cinerarius 



Piece of seaweed 



1 pebble 



Fragment of seaweed 



4 pebbles 



1 pebble 



7 pebbles, fragment of seaweed 



3 , 



5 



2-0 

 4=5 



3-5 

 0-5 

 1-0 

 03 



1-1 

 0-3 

 0-6 



0-250 

 0-562 



0-437 

 0-062 

 0-125 

 0-037 



0-137 

 0-037 

 0-075 



4-5 



0-3 



1-533 



0-191 



Two Sea-Urchins of 27 mm., each weighing 12*7 gr. 



2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 

 10 



3 fragments of seaweed, piece of Ser- 



tularia operculata 



3 pebbles 



3 „ 



1 pebble 



7 pebbles 



Piece of seaweed 



3 pebbles 



5 ■ „ 



2 „ 



1 pebble 



0-1 

 0-7 

 0-5 

 2-2 

 2-7 

 1-6 

 0-2 

 2-4 

 0-2 

 0-2 



0-007 

 0-055 

 0-039 

 0-173 

 0-212 

 0-125 

 0-015 

 0-188 

 0-015 

 0-015 



2-7 



0-1 



1-080 



0-084 



Certain points, some of which are clearly brought out in the 

 foregoing records, began to appear as the investigations pro- 

 ceeded. The records show, for example, that the proportion 

 between the weight of the objects carried and the weight of the 

 body of the Sea-Urchin was much higher in the smallest indivi- 

 dual than it was in any of the others, and (if the individual of 



