THE SPERM-RECEPTACLE IN CAMBARUS. 



177 



the broken line, which represents its bottom. It is a very narrow 

 and not very deep pocket. The dotted lines indicate the walls 

 of the pocket and these are the continuations of the thick shell, 

 running in to line the pocket. 



FIG. 6. Dorsal view of same specimen, 



As shown in Fig. 6, this pocket comes to an end on the dor- 

 sal face of the posterior lobe of the annulus, after curving 

 around the posterior face. Coming up from the left of the ob- 

 server the mouth of the pocket runs a very short distance and 

 the part of the pocket directly at this end is very short, but 





FIG. 7. Posterior face of posterior 

 lobe of annulus of the same specimen, 



FIG. 8. Section of part of 

 posterior lobe of annulus of 

 left-handed female 30 mm. 

 long, 2/>. 



through the thickness of the annulus the other, or ventral end 

 of the pocket, is seen above and to the right of the figure. 

 This becomes easy of comprehension when the sperm-pocket is 

 viewed directly from the rear, as in Fig. 7. From this view the 



