21:1 



EXPLANATION OF PLATES* 



Abbreviations 



.lining layer of cytoplasm. 



.lumen of digestive tract. 



.lumen of diverticulum. 



.musculature. 



, nucleus. 



, origin of tubules of diverticulum. 



, peritoneum. 



.penial bull) invagination. 



, penial lumen. 



.penial pore. 



.peripberal gland cells. 



.retractor muscle. 



, sperm duct. 



, spcrmathecal duct. 



, tubules of diverticulum. 



Henlea moderata 



Outline of brain, dorsal view. 



Outline of nephridium. 



Seta bundle. 



Spermiducal funnel. 



Lymphocyte. 



Outline of anterior end, lateral view^. 



Spermatheca. 



Part of transverse section of digestive tract in region of taste organs. 



Seta. 



Transverse section of intestine in posterior part of VIII, through origin 



of tubules of intestinal diverticulum. 

 Transverse section through intestinal diverticulum. 

 Penial bulb in a transverse section of the worm. 



[Henlea urbanensis] 

 [For explanation see under Plate XII] 



Lumbricillus rutilus 

 Fig. 13. Outline of anterior end, showing details of blood vascular system. 



Plate IX 



Fig. 14 

 Fig. 15. 

 Fig. 16, 

 Fig. 17 

 Fig. 18 

 Fig. 19. 

 Fig. 20, 

 Fig. 21 

 Fig. 22 

 FiG. 23 

 Fig. 24 



Lu'.nbricillus rutilus — cont. 



Spermiducal funnel, surface view. 



Outline of nephridium. 



Outline of spermatheca. 



Sectional view of spermiducal funnel. 



Transverse section of ventral gland in XIII. 



Transverse section of ventral gland in XIV. 



Outline of ventral glands in XIII and XIV, dorsal view. 



Seta bundle. 



Outline of brain, dorsal view. 



Longitudinal section of spermatheca. 



Penial bulb in a transverse section of the worm. 



*IlIustrations by the author. 



