SPERM-TRANSFER ORGANS IN CAMBAROIDES. 



26l 



gent tips. In a male 45 mm. long, with stylets 8 mm. long, 

 their tips were two millimeters apart, across the median line. 

 Each stylet has the same structure as in C. siniilis, with only 

 slight differences in proportion, but the groove opens more 

 toward the median face and is not seen from behind, Fig. 5. 

 While the tip Fig. 6 presents the same details as in C. siniilis, 

 Fig. 4, the cutting edge is less sharply set off from the head of 



FIG. 5. 



FIG. 6. 



the ridge and runs out externally as a pronounced angle or spine, 

 that is lacking in the former species. 



From an end view the tip of the organ of C. Japonicns is com- 

 plexly modelled and suggest not a cutting tool but a probe to be 

 forcefully inserted against resistance. 



Serial sections of the first stylets of both species show the 

 same inside structure. A thick, firm shell covers the soft 



