EXPLANATION OF PLATE VIII. 



Fig. I. — Anterior portion of boch' of Fridericia steivarti. The 

 clitellar region being somewhat opaque is shaded. Setal bundles of 

 segments ii and iii alone represented. Numbering of segments 

 indicated by small Roman numerals. The animal is seen a little 

 obliquely, but mainly from the ventral side ; semi-diagrammatic. 



e.g., cerebral ganglion ; ch., chambered body surrounding ali- 

 mentary^ canal in segment viii ; cl., clitellar epitheHum ; g/., 

 oesophageal glands ; l.s., lateral setal bundle ; m., mouth ; m.h., 

 muscular bands attaching pharynx to bod5^-wall ; oes., oesophagus ; 

 ov., masses of ova ; p.c, peritoneal epithelium, here (segm. ix) 

 markedly elongated where it surrounds the alimentar}^ tube-; ph,, 

 pharynx; /)y., prostomium; s.w., sperm-morula; s/)., spermatheca; 

 sp'., its external opening ; v.s., ventral setal bundle ; y., yolk mass. 



Fig. 2. — Lymph corpuscles of Fridericia stewarti. 



Fig. 3. — Longitudinal section of segments x, xi of Limnodrilns 

 sp. (?). The testis, main part of vas deferens, and seminal funnel 

 do not happen to be cut ; these are shown in the next figure. 



Atr., atrium ; corp., lymph corpuscle ; /., funnel ; h., '' heart " 

 {V,; ovy. , ovary ; pen., -penis; /)ys^., prostate; s.i!'.^/),, tall epithelium 

 at base of sperm atheca ; s/'/'/^., spermatophore ; spz., spermatozoa 

 entering funnel; s.s. sperm-sac; te., testis; v.d., vas deferens; v.v., 

 ventral vessel. Other references as in fig. i. 



Fig. 4. — Horizontal section of segments x, xi of Ltmnodnlus 

 sp. (?) near the ventral surface. References as above. 



