238 



THE INVERTEBRATA 



B 



Fig. 170. 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; brn. brain; cng. cingulum; cl.a. cloacal 

 aperture ; d.an. dorsal antenna ;f.c. flame CG\\\g.gl. gastric gland ; ect. syncytial 

 ectoderm of trochal disc; M. mouth; mc. circular and ml. longitudinal 

 muscle cells ; ms. muscular mastax and trophi ; np. nephridium, intracellular 

 duct represented by double dotted line; ov. ovary; oe. oesophagus;/), penis 

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

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



