KK.MAKKAIÎLE «PECIES OF ECIIIUIIOIDS. Gl 



tiiinctl in a common connective-tissue ridge, projectiog prominently 

 into the body-cavity (c). Zeiss, oc. 2 and liom. imm. -^^. 



Fig. 13. — Part of a transverse section of the male, passing through the 

 posterior portion of the anterior one-eighth of the body. Two 

 (I and II) of the four terminal branches of vas deferens are seen 

 free in the body-cavity. About 65 x . 



Fig. 14. — Sections of the tubular terminal branches (four in number) of the 

 vas deferens. All the branches lie free in the body-cavity ; they 

 are cut through in various directions. Zeiss, oc. 3 and obj. E. 



Fig. 15. — Cross-section through a ciliated funnel of the vas deferens, 

 close to the inner end. As the result of preservation, the funnel 

 has lost its natural shape and the section is seen to have passed 

 at two opposite places through the parts where the inner and 

 outer epithelia are directly continuous. About 410 x . 



Fig. 16. — Highly magnified figure showing a sperm-cell mass (s.m.) together 

 with the underlying ventral nerve-cord (v.u.), both in cross section. 

 The sperm-cell mass is fixed to the bodj'-wall over the nerve-cord 

 by a short mesentery-like stalk. Zeiss, oc. 2 and hom. imm. J^« 



Fig. 17. — Part of the wall of the vesicular body, representing the dege- 

 nerated alimentary canal of the male. The inner epithelial 

 cells (ejit.) are vacuolated and are provided at the inner end with 

 pseudopodia-like processes. Zeiss, oc. 2 and horn. imm. Jg. 



(Figs. 18 — 22, Thalassema tœnioides.) 



Fig. 18. — Anterior part of a dissected specimen, showing, among otlier 

 things, segmental organs in situ. In the regions marked with c, 

 a number of the organs have been cut off at the roots, in order 

 to show the manner of their arrangement. About 1.5 x . 



Fig. 19. — Same as above, to show the anterior courses of the dorsal {d.v), 

 and the ventral vessel {v.v.), and also the ring vessel (r.v.). The 

 ring vessel runs over and beyond the interbasal muscle {i.m.) of 

 the ventral hooks ; at the proboscis basis it divides into three 

 short branches, for which see the following figure. 2 x . 



Fig. 20. — Greatly magnified figure representing the manner of communica- 

 tion between the bases of the two lateral vessels (l.v.) of pro- 

 boscis and the three anterior branches of the ring-vessel (r.v.) 

 mentioned above. 



Fig. 21. — Corpuscular bodies floating in the ceclomic lluid. a, surface 



