g Art. 2. — T. Kaburak; : 



Numerous testes occur close togetlier in tlie dorsal parts of 

 the body, arranged in two longitudinal lateral zones which extend 

 posteriorly from behind the ovaries. Eacli testis is, as usual, com- 

 posed of sperm-mother-cells and spermatozoa in several stages of 

 development, enclosed by the tunica propria. They have not been 

 observed to connect with sperm ductules, but tlie vasa dei'ereniia, 

 on the other hand, are distinctly discernible in the pliaryngeal 

 region. The vasa deferentia, proceeding backwards just inside the 

 longitudinal nerve cords on the ventral side, make a forward turn 

 just before entering the penis, and open separately into the cavity 

 of the latter. The wall of the vas deferens, filled with spermatozoa, 

 consists of an epithelium and an outer layer of circular muscles, 

 which is strongly developed in tlie neighbourhood of the penis. 



od go 



Text fig. 2. Reproductive organs of Pd. aiinai.dalei in sagittal secti< n, 

 diagrammatically sliown. 



at atrium, go genital opening, od oviduct, of unpaired couinion oviduct, 

 sr seminal receptacle, sv seminal vesicle, v vagina, rd vas deferens. 



The penis, wdiich is wholly devoid of intromittent part of any 

 sort, is a pear-shaped, saccular organ with a strongly thick muscular 

 w^all and entirely embedded in the parenchyma, the internal cavity 

 opening on the floor of the anterior part of the atrium The cavity 

 of the penis is lined with an epithelium, which projects to a con- 

 siderable extent into the lumen of tlie organ in folds, thus pruduc- 



