SPERM-TRANSFER ORGANS IN CAM15AROIDES. 



265 



triangle can fit into the groove in the first stylet. In Canibarns 

 the projection of the second stylet fits accurately to the groove 

 of the first stylet and insures sperm transfer and in Cambaroides 

 we can see that the projection upon the second will run in the 

 groove of the first but it does not seem nicely adjusted to it. 



Another departure from the finer adjustments of Cambarus 

 may be inferred from the simpler mode of ending of the defferent 

 duct. While in Cambarus it ends in a soft papilla that is fitted 



FIG. 12. 



into the groove of the first stylet, in Cambaroides there is, at 

 least in the preserved specimens, only a rounded, slightly raised 

 area with a slit in it for the exit of the sperm. 



The under side of the thorax of the male, Fig. 12, shows the 

 ending of the defferent duct as a small opening in a rounded 

 raised area on the base of the fifth leg, right and left. In Cam- 

 baroides Japonicns, Fig. 12, these rounded areas are soft and the 

 entire adjacent surface of the base of the leg is also membranous, 

 as indicated by the dotted region, except for the minute hard 



