BIOLOGICAL STUDY OF CHESAPEAKE BAY WATERS 
373 
63. Balanoglossus and Amphioxus occur in the lower part of Chesapeake Bay, 
while the ascidian, Molgula manhattensis, has been taken in large numbers from the 
region between the mouths of the Patapsco and Rappahannock Rivers — in other 
words, in the less saline part of the bay. 
64. The only vertebrates collected on our cruises have been fishes. 
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