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304 MR FRANK E. BEDDARD 



DESCRIPTION OF PLATES. 

 Plate I. 



Phreodrilus suhterraneus. 



Setae, a, dorsal ; h, ventral. 



Funnel of vas deferens. 



Transverse section of narrow part of atrium. 



Longitudinal section through atrium where lumen is wider. 



Semidiagrammatic view of genitalia, te, testis ; /, funnel of vas deferens ; eff, efferent canal ; s, setae ; 



od, oviduct ; ov, ovary ; sp, spermatheca. 

 " Bloodgland." hi, blood-clots. 

 7. Male efferent apparatus. /, funnel ; spt., septum ; v.d, vas deferens ; sp', blind appendix of vas 

 deferens ; /, their junction within periatrial sac (sac) ; £ , external orifice. 

 Longitudinal section through nerve-cord, nc, neurochord branching where nerve is given off. 

 Longitudinal section through external aperture of atrium, showing adjacent parts of efferent duct. 

 £ , external pore ; at, distal section of atrium ; at' , portion of atrium lying within periatrial space 

 (p.sp) ; v.d, vas deferens ; sp, appendix of vas deferens. 

 Fig. 10. Longitudinal section through spermatheca. 

 Figs. 11, 12. Longitudinal and transverse section through appendix of vas deferens, a, secreted matter in 



lumen of tube. 

 Fig. 13. External ventral view of genital segments which are numbered and show position of orifices. 

 $ , male apertures ; od, oviduct pores ; sp, spermathecal pores ; the nerve-cord is indicated as 

 showing through the body walls, and the setae are shown. 

 Fig. 1 4. Transverse section through body wall, s, seta sac ; ep, epidermis ; tm, transverse muscles ; Im, longi- 

 tudinal muscles. 

 Fig. 15. Separate lamella? of longitudinal muscular coat. 



Plate II. 



Fig. 16. Phreodrilus suhterraneus, a portion of the contents of periatrial sac. vd, vas deferens in transverse 



and longitudinal section ; sperm, spermatozoa ; n, nuclei lying between them. 

 Fig. 17. Pelodrilus violaceus, natural size, showing clitellum (d). 

 Fig. 1 8. Phreodrilus suhterraneus, oviduct. 



Fig. 19. „ „ longitudinal section of body wall. 



Fig. 20. Pelodrilus violaceus, section of epidermis to show glandular papilla (g). s, seta?. 

 Fig. 21. „ „ nephridium as seen on dissection. /, funnel ; spt., septum ; o, external orifice ; 



s, setae. 

 Fig. 22. „ „ ventral view of genital segments which are numbered, sp, spermathecal pore ; 



$ , male pores; ? , oviducal jpore. The extent of the clitellum is indicated 



by the dotted portion. 

 Fig. 23. „ „ spermatheca transverse section, n, nucleus of glandular cells ; a, parasites (1). 



Fig. 24. „ „ nephridial funnel, hi, blood capillary. 



Figs. 25, 26. „ „ septa to show relative thickness of specially thickened anterior septa (fig. 20) 



and posterior septa (fig. 25). 

 Fig. 27. „ „ dissection to show genitalia, semidiagrammatic. sp, spermathecae ; sps, sperm 



sacs ; these are cut open in segments X and XI to show the testes and vasa 



deferentia lying within them ; t, testes ; /, funnel of vasa deferentia ; ov, 



ovary; od, oviduct. 

 Fig. 28. „ „ longitudinal section through external orifices of vasa deferentia of one side of 



the body. 

 Fig. 28a. „ „ spermatheca. 



Fig. 29. „ ,, supra-cesophageal ganglia, lateral view, dv, dorsal blood-vessel ; com, peri- 



cesophageal commissure. 



