PLATE 5 
EXPLANATION OF P'IGURES 
34-36 Sections of glochidia of Lampsilis ligamentinus, taken 15 minutes, 
30 minutes, and 3 hours, respectively, after attachment to gill filaments. In 34, 
the proliferation of epithelium is just beginning; in 35 it has made some progress; 
and in 36 formation of the cyst has been completed. In the first two figures several 
mitoses are shown in the epithelium where multiplication of cells is taking place. 
37-38 Sections of glochidia of Symphynota complanata, 6 and 24 hours, 
respectively after attachment, showing two stages in cyst-formation on fins. In 
37 the cellular detritus is being ingested by the larval mantle cells, while in 38 
this process has been completed. Mitosis in the cyst wall is shown in both figures. 
