Fig. 1 88. Reproductive organs of the Chaetopoda. A, Polychaeta (longi- 

 tudinal section of Serpula ititestifialis to one side of the middle line). Original. 

 Oligochaeta. B, Naididae, diagrammatic. After Stephenson. C, Lumbricus 

 terrestris, diagrammatic. After Hesse, at. atrium ; cl. clitellum ; ect. ectoderm ; 

 m.c. circular and m.l. longitudinal muscles; o. ovary; od. oviduct; os. ovisac; 

 ov. ovum; s.f. funnels of vas deferens; sp.s. sperm sac; s.v. seminal vesicle ; 

 spth. spermatheca; t.s. testis sac; t. testis; v.d. vas deferens. D, dorsal and 

 V, ventral. The numbers are those of the segments, the vertical lines are septa. 



