428 EDWIN S. GOODRICH. 



Fig. 7. — Portion of a transverse section ofPolygordius neapolitanus 

 showing the nephridium lying on the oblique muscles. Cam. D, oc. 3. 



Fig. 8. — One of the supporting rods of the penis. 



Fig. 9. — Portion of three genital segments of a male, seen under pressure 

 from above. The internal organs are represented in optical section. From 

 the living. Oil im. ^. 



Fig. 10. — Portion of a transverse section passing through a penis. Cam. 

 D, oc. 2. 



Fig. 11. — Part of a similar section passing through the nephridium and 

 sperm-sac. Cam. D, oc. 2. 



Fig. 12. — Section through the septum and edge of the funnel in a male 

 genital segment. Cam. Oil im. yV ^^- ^• 



Fig. 13. — Section through the spermatheca and its duct from a longi- 

 tudinal series. Cam, Ap. 4 mm., oc. 3. 



Fig. 14. — Diagram of the male and female excretory and genital ducts, 

 seen in transverse section. 



Fig. 15. — Portion of a sagittal section of several segments in the oesopha- 

 geal region of a female, shoveing the nephridia opening into the coelom. Cam. 

 D, oc. 2. 



Figs. 16, 17. — Two transverse sections of one series, the first taken 

 through the posterior end of the brain, the second across the mouth. Cam. 

 D, 00. 2. 



Figs. 18 — 20. — Three transverse sections of one series, showing the posi- 

 tion and structure of the ventral pharyngeal sac. Cam. D, oc. 2. 



Fig. 21. — Transverse section of a genital segment of a female. Cam. D, 

 oc. 2. 



Fig. 22. — Small part of a similar section, showing the position and struc- 

 ture of the nephridium. Cam. Oil im. yV, oc. 3, 



