CHAETOGNATHA 



543 



—al.c. 



"ga.v. 



od. 



■ts. 



Fig. 403. Sagitta hexaptera. Ventral view, x 3!. After O. Hertwig. al.c. 

 alimentary canal ; An. anus ;/«. fins \ga.v. ventral ganglion -J. jaw ; ikf. niouth ' 

 od. oviduct; ov. ovary; sp. spines; ts. testis; v.d. vas deferens; v.s. vesicula 

 seminalis. 



