812 Jean Shannon 



EXPLANATION OF PLATES. 



Plate XXVIL 



Fig. 1. — Anterior end of eartlnvorm, to show external features'- 

 (cliagramatic). 



Fig. 2. — Diagran^ of anterior end of worm, to show alimentary 

 canal and dorsal blood vessels. 



Fig. 3. — Diagram of anterior end of worm, to show reproductive- 

 organs, nervous system, and accessory glands. 



Plate XXVIII. 



Fig. 1 . — Ant-erior end of worm, ventral view, to show maim 



external features. 

 Fig. 2. — Diagram of longitudinal section through region of sper- 



pnathecae. 

 Fig. 3. — Types of spermathecae. 

 Fig. i. — Diagram of segment thirteen, to show relative position! 



of associated parts. 

 Fig. 5. — Sketch of spermiducal gland of right side, to show 



general features. 

 Fig. 6. — Drawing of longitudinal horizontal section of problematic 



gland, in thirteenth segment under the low-powered 



objective. 

 Fig. 7. — Part of problematic gland from thirteenth segment, under 



the high-powered objective. 

 Fig. 8. — Tranverse section of tliic spermiducal gland, to show 



main duct. 

 Fig. 9. — Diagram of longitudinal vertical section of spermiducal 



gland, to show mode of entrance off the vasa deferentia. 



Plate XXIX. 



Fig. 1. — Longitudinal section of spermathecal region:. 



Fig. 2. — Drawing under the high-powered objet-tive of the last 



pait of the duct from a glandular structure associated 



with the spermathecae. 

 Fig. 3. — Drawing under the high-powered objective of a section^ 



through one of the glandular structures associated witln 



the spermathecae. 

 Fig. 4. — Longitudinal section in the region of the possible nepliri- 



dial organs. 



