96 ALICE L. EMBLETON ON THE STKUCTURE AND 



Plate 8. 



Fig. 13. Diagrammatic section through the mouth. 



14. „ „ „ pharynx. 



15. „ „ » crop. 



16. „ „ ,. gizzard. 



17. „ „ „ intestine. 



18. „ „ „ rectum. 



13 a. [Drawn with the camera lucida.] Detailed drawing of part of fig. 13. 



14 a. ,. „ .. „ „ .. .- H- 1-^- 

 17 «. .. „ „ „ „ „ ,, ^g- I''- 

 18 «. ., „ „ „ „ „ „ fig. 18. 



19. Alimentary canal where the collateral intestine arises. 



20. ., .„ ., .. „ ends. 



21. „ „ opened, showing the aperture leading into the origin of the collateral intestine. 

 21 a. Transverse section through the intestine and coUatet-al intestine. 



21 b. ,, „ „ ciliated groove. 



Plate 9. 



Fig. 22. [Drawn with the camera lucida.] Transverse section of the body on a level with the basal 

 muscle of the setae. 



23. [With camera lucida.] Transverse section of the body at the nerve bifurcation. 



24. ,. ,. , ,, ,. ,. ,, showing the sinuses of the proboscis 

 opening out as the ccelomic cavity. 



25. [Drawn with the camera lucida.] Transverse section of the body where the segmental organs 



open interiorly and exteriorly. 

 2r). [Drawn with the camera lucida.] Transverse section through the prostomium. 



27. Dissection of the buccal loop (" oesophageal loop ") of the nervous system. 



28. Transverse section of the ventral nerve-cord. 



29. Part of same, more highly magnified. 



30. Longitudinal section of the nerve-cord. 



31. Dorsal region of a trans, sect, through the ventral nerve-cord of Luinbricus. 



32. „ „ „ „ „ •, „ E. unicinctus. 



Plate 10. 



Fig. 33. Piece of contracted anal vesicle. 



34. Section through same. 



35. Surface view of a contracted vesicle (carm. alum ; clarified in oil of cloves). 



36. [Camera lucida drawing.] Trans, sect, of posterior end of the body, whei'c the anal vesicles 



open into the rectum. 



37. [Camera lucida drawing.] Section of one fold of wall of rectum, anterior to the opening of the 



anal vesicles, showing the two kinds of tissue (stained in bulk with carm. alum). 



38. Longitudinal section through a segmental organ with its openings. 



39. E. unicinctus when first opened, with its viscera '• in situ," showing the distribution of the 



mesenteric strands. 

 40-43. Series of transverse sections through the body, showii'.g the radial arrangement of the 

 mesenteric strands. The coelom gradually passes over into the sinuses of the proboscis. 



