

398 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Fig. 11. Transverse section through segment 14, 

 showing the ovisac and sperm sac. x 90. 



Fig. 12. Longitudinal section through the body wall of 

 a mature worm in the region of the clitellum. 

 x 520. 



Fig. 13. Longitudinal section through the wall of the 

 intestine, showing the details of its structure, 

 x 370. 



Fig. 14. Chloragogen cells in the living condition, 

 drawn directly after their separation from 

 the wall of the intestine. The nucleus is not 

 shown, as it is very difficult to see in the 

 fresh cells. x 1000. 



Fig. 15. Chloragogen cells : the cells were separated 

 from the wall of the intestine, fixed in 

 Perenyi's fluid and stained with Brazilin on 

 the slide. The irregularity in shape is due 

 to the shrinkage, x 1000. 



Plate IV. 



Fig. 16. Longitudinal section through the reproductive 

 segments 10-13 of a mature worm. One of 

 the spermathecae (sp.) only is shown cut 

 twice. It is much enlarged and extends into 

 segment 12. The septa between the segments 

 were not visible in the preparation. x 120. 



Fig. 17. Longitudinal section through the ciliated 

 funnel of a mature worm covered with 

 spermatozoa, showing its structure and con- 

 nection with the vas deferens, x 230. 



