210 



THE INVERTEBRATA 



Fig. 164. Hydatina senta. A, Female, ventral view. Original. B, Male, 

 side view. After Wesenberg Lund. al. rudiment of alimentary canal; 

 la.an. lateral antenna; bl. bladder; brti. brain; c?2g. cingulum; d.a. cloacal 

 aperture ; d. an. doTsal antenna ; f.c. flame cell ; g.gl. gastric gland ; ect. syncytial 

 ectoderm of trochal disc; M. mouth; m.c. circular and m.l. longitudinal 

 muscle cells; 7?is. muscular mastax and trophi; np. nephridium, intracellular 

 duct represented by double dotted line; ov. ovary; oe. oesophagus; p. penis 

 retracted; ped.gl. pedal gland; pa. papillae with large cilia; st. stomach; 

 t. testis; tro. trochus; vit. vitellarium. 



