Euterpe, whose name translates as 'giver of much delight' is considered the muse of music and lyric poetry, her attribute was the double flute.
Which is a bit hard to see in the scan is that Ladenspelder made some errors in his copy - in the right bottom corner he engraved the numeral as '13' instead of '18', and in the left bottom corner a 0 instead of a 'D'.