Natural history and propagation of fresh-water mussels . Fig. 1.—Rear view of yellow sand-shell in natural positionin bottom under water, showing the two siphonal open-ings, the gaping shell, and the apposed margins of themantle. Fig. 2.—Rear view of Anodonta corPulenta showingsiphonal openings. Note the very smooth margins ofthe upper exhalent opening and the fimbriae or feel-ers protecting the lower or inhalent opening.

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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherwashi, bookyear1921