470 



BOUNDARIES OF THE SEA 



4 6 



Weeks 

 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 



Stop for 70?S, Resp. 80% of Stop for Long- 



All Pelagic Larval Species Distance Larvae 



Fig. 3. Number of weeks used by the most important ocean-crossing surface 

 currents to pass from coast to coast in relation to the length of pelagic larval life 

 of bottom invertebrates (coastal forms). (Explanation on facing page.) 



