444 



TOKIO KABURAKI : 



a spermatophorc was found lodged in the penis and was evidently 

 formed there. 



In fig. I is given a sagittal longitudinal section through the penis 

 and adjoining parts of the Planaria individual in question. A sper- 

 matophorc, apparently completely formed and ready for ejection by the 



penis, occupies the po- 



Fig. 1. 



ili- h^r-x^is^^' 



Fig. l. A sagittal longitudinal section through genital 

 end-organs of Planaria vivida, showing the sperma- 

 tophorc in situ. 



de ductus ejaculatorius, od oviduct, fs penis sheath, 

 .<•/// spermatophorc, vd vas deferens. 



sition of the terminal 

 swelling of vas deferens 

 impar or the vesicula 

 seminalis, completely 

 filling it up and to a 

 degree distending the 

 same. It is nearly of 

 a pyriform shape, bent 

 at the pointed end and 

 measuring 216 jjl by 

 133 ;x. The body is so 

 oriented that its point- 

 ed end is directed to- 

 wards, and projects 

 somewhat into, the dis- 

 tal end of the vas def- 

 erens impar. (For the 

 parts of the genital end- 

 organs of PL vivida, 



see this volume of the journal p. 164, fig. 17). The capsule is 0.5- 

 3 ft thick, being thickest towards the pointed end. Its substance is not 

 homogeneous but exhibits a porous structure when seen under the high 

 power. Microchcmically it shows special affinity for eosin, quite agreeing 

 in this respect with the secretion of the penis gland, found abundantly 

 in the parenchyma round the penis bulb and more sparsely in the wall 

 of the penis itself. 



