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38.

-teriors, and for the fact that they sometimes produce valuable pearls. One species ([[underline]] Unio margaritiferus [[/underline]]) found in many parts of the northern hemisphere, has been collected for ages in Europe, for the pearls it produces. 

Family Aviculidae. Nos. 189-190
The Pearl Oysters.

There are three species or varieties of the True Pearl Oyster ([[underline]] Meleagrina [[/underline]]), one of which is found on the Pacific coast
 

Transcription Notes:
Is it important to put a space between the double-bracketed text and the text it "modifies" so that it will be searchable? I have seen several places where something like this with "underline" on either side of the underlined word is immediately adjacent with no spaces, making it difficult, I would think, to search for the word... I added spaces to this page but did not in previous pages...