4g0 W. s. NICKERSON, On Stichocotyle uepbropis Cunningham. 



suckers to one another. Made by combining iu uuc drawing two dif- 

 ferent sections of the same worm. X 22. 



Fig. 8. Cells, probably ganglionic, seen in the anterior end of the 

 living worm under a compressor. Freehand. 



Plate 30. 



Fig. 9. Muscles of body-wall as seen in tangential section of the 

 side of the body. X ^05. 



Fig. 10. Parenchyma muscle cells. X '^^'^• 



Fig. 11. Longitudinal muscle cell of body wall. X '^5'^- 



Fig. 12. Diagram of nervous system as seen from dorsal side. 



Fig. 13. Sensory organs: a) section through cuticula perpendicular 

 to the surface; b) tangential section. X ^^^• 



Fig. 1 4. Sensory organ from interior of sucker, showing connection 

 with ganglionic (?) cell. X "^^O- 



Fig. 15. Sensory organ in process of formation; filament growing 

 out thi'ough the cuticula. X 750. 



Fig. 16. Longitudinal muscle fibres of body-wall from specimen 

 preserved in Mekkel's fluid. X 7^^- 



Fig. 17. Concretions from excretory vesicles; a and 6, typical 

 forms; c and d forms occasionally present; f small bodies from excre- 

 tory vesicle of one specimen. X '^^^• 



Fig. 18. Appearance of cuticula seen in tangential section. X -55. 



Fig. 19. Dorsal view of anterior end of living specimen, as seen 

 under compressor; showing distribution of capillaries terminating in 

 flame cells. Concretions represented in excretory vesicle of right side 

 only. Outlines only with aid of camera. 



Fig. 20. Section through cuticula of specimen killed in Merkel's 

 fluid. X 750. 



Plate 31. 



Fig. 21. A sucker as seen in transverse section. X -'^•^^• 



Fig. 22. Median sagittal section through posterior end of body. 



X 114. 



Fig. 23. Dorsal view of preparation of whole specimen killed 

 while under compressor; drawn to show excretory .system. Camera 

 outlines (X 36) î ^^^ tubules put iu freehand by aid of higher power 

 (Zeiss D). 



Fig. 24. Collecting tubules of excretory system; a) as seen in 

 whole preparation (Fig. 23) ; b) longitudinal section ; c) cross section. 

 X 495. 



Fig. 25. Transverse section of intestine toward posterior end. 

 X 495. 



Fig. 2<i. Elongated intestinal epithelial cells as seen in oblique 

 section. X ^95. 



