Sentence:  My hopes wa'n't disappointed. I never saw clams thicker than they was along them <WSD>inshore</WSD> flats. I filled my dreener in no time, and then it come to me that 'twouldn't be a bad idee to get a lot more, take 'em with me to Wellmouth, and peddle 'em out. Clams was fairly scarce over that side of the bay and ought to fetch a fair price. 
Meaning of the word marked with <WSD> tags:  Close to (especially in sight of) a shore.