Natural history and propagation of fresh-water mussels . Fig. 2.—Glochidia of washboard mussel, Quadrnla hcros, onfin nf fresh-water drum. Cyst very much enlariied. Fig. 3.—Section through vacated cysts on gill filaments;Qiiadnila ebenus on river herring. Bull., U. S. B. F., 1919-20. Plate XMI.

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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherwashi, bookyear1921