312 



Jean Shannon : 



EXPLANATION OF PLA1ES. 



Plate XXVII. 



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



. (diagramatic). 

 Fig. 2. — Diagram 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 . — Anterior end of worm, ventral view, to show mains 



external features. 

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



mathecae. 

 Fig. 3. — Types of spermathecae. " 



Fig. 4. — 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. — DraAving of longitudinal horizontal section of problematic- 



gland, in thirtieenth segment under the low-powered 



objective. 

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



the high-powered objective. 

 Fig. 8. — T'ranverse section of the 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. 



Fig. l.-l 



Fig. 2 



Plate XXIX. 



Longitudinal section of spermathecal region. 



I)rawing under the high-powered objective of the last 



part of the duct from a glandular structure associated 



with the spermatliecae. 

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



through one of the glandular structures associated with- 



the spermathecae. 

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



dial organs. 



