SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I48 



80* 75* 70* 65* 60" 



75° 70* 65« 



Fig. 1. — Location of stations. 



towing was approximately 2 knots. The samples were preserved in 

 5-percent formalin, buffered with hexamethylenamine. 



Acknowledgments. — Travel, ship-time, and facilities for this work 

 were provided by the Woods Hole Oceanographic Institution, sup- 

 ported variously by the Office of Naval Research under contract 

 Nonr-2196 and the Atomic Energy Commission under grant AT 

 (30-1) -1918. I am grateful to the Woods Hole Oceanographic In- 

 stitution staff for making this study possible, for their assistance 

 aboard ship, and for the collateral data that they made available. This 

 is Woods Hole Oceanographic Institution Contributions No. 1498. 



HYDROGRAPHIC SETTING 



Between Cape Cod and Bermuda the subtropical waters of the 

 Sargasso Sea are in close proximity to the temperate shelf and slope 



