ORGANS FOR SPERM-TRANSFER 245 
Fig. 3 Cross section of the sperm duct and valve along the line 3 of fig. 2, 
showing the duct closed by valve ridge. 2. A. 
Fig. 4 Cross section of the sperm duct along the line of 4 of fig. 1, showing the 
muscular wall and the lining epithelium disintegrating in secretion. 2. A. 
Fig. 5 Extreme tip of right first stylet, showing the groove bottom coming to 
the surface, posterior face. 2. A. Ex. m.—the external mass. M.m.—the in- 
ternal mass. 13—the level of the section, fig. 13. 
Fig. 6 Diagram of stylet as in plate 1, fig. 1, to show location of glands in the 
interior, and the location of the sections, 7 to 13, shown in figs. 7 to 13. 
