Sentence:  During the past few days large quantities of herrings have been caught at Clovelly. One fisherman, James Small, brought in about twenty <WSD>mease</WSD> (<WSD>mease</WSD>, 600). The prices realised have fallen so low as 5s. per <WSD>mease</WSD>. 
Meaning of the word marked with <WSD> tags:  A measure of varying quantity, often five or six (long or short) hundred, used especially when counting herring.