﻿550 ILLUSTRATIONS. 



15. Longitudinal median section of segment 475. showing below, the vitellogen 

 gland resting on the transverse canal ; above and to the left the shell 

 gland, above which the posterior extremity of uterus is faintly visible; 

 more anteriorly the inner extremity of the greater ovarian lobe appears 

 as it crosses the median line; above it ai - e seen the well-expanded coils 

 of the uterus. 1X60. 



Plate V. 



Fig. 16. Saggital section of segments 555 to 556, showing further development of 

 the uterus; numerous diverticula have spread laterally, in different 

 planes from the outer walls of the uterine dilations and spiral coils. 

 1X10. 



17. Saggital sections of segments 647 to 648 showing the irregular, compact 



structure of the uterus in gravid segments. 1X12. 



18. Segment slightly compressed, showing gravid uterus. 1X10. 



