Sentence:  He and Gerald usually challenged the rollers in a sponson canoe when Gerald was there for the weekend; or, when Lansing came down, the two took long swims seaward or cruised about in Gerald's <WSD>dory</WSD>, clad in their swimming-suits; and Selwyn's youth became renewed in a manner almost ridiculous ... 
Meaning of the word marked with <WSD> tags:  A small flat-bottomed boat with pointed or somewhat pointed ends, used for fishing both offshore and on rivers.