210 



PROCEEDINGS OF THE ACADEMY OF 



[Feb., 



Testes four or five on each side, unpaired, dorsal, and irregularly dis- 

 tributed from the region of the ovaries to the posterior end of the 

 pharynx (figs. C and D). Penis long and slender, not filling the 



^pi) 



•'^''g- C. Median longitudinal section of Planaria simplissima showing repro- 

 ductive organs. Parts out of the plane of the section are shown in dotted 

 lines. a=antrum. 6 — brain. o=;ovary. cc/^^oviduct. p=penis. /= testis. 

 w= uterus. W=vas deferens of one side. a;= ciliated tube opening into 

 uterus. v=:vagina. 



Fig. D. Reconstruction from several cross-sections 'showing ovaries (o), ovi- 

 ducts {od), nerve cords {n) and testes (t). 



antrum. Uterus consisting of a chamber lined with glandular epi- 

 thelium, dorsal to the antrum, and with an anterior prolongation in 

 the form of a narrow ciliated tube with no enlargement at its anterior 

 end. Vasa deferentia two, opening separately into the anterior en- 

 largement of the lumen of the penis. Oviducts two, ventral and par- 

 allel with the nerve-cords, uniting before entering the uterus (figs. C 

 and D). Vitellaria extending from the region of the ovaries to the 

 posterior extremity of the animaL 



Foimd on the under side of stones and leaves along the margin of 

 small streams. 



