26 Art 2.— T. Kaburaki : 



species of the Triclacls, always contained in the cavit}^ of the 

 seminal receptacle or the so-called uterus. Much discussion has 

 arisen as to its formation. Max Schultze (65) found in the re- 

 ceptacle of PI. torva one or two spermatophores or empty spermato- 

 phore capsules, which are of a retort shape and of a l)rown chitinous 

 nature, and placed on record a view that the spermatophore after 

 being prepared in the penis-lumen, is introduced, by the act of 

 copulation, from one individual into the receptacle of another. Von 

 Kennel (45), harbouring some suspicion, of this view, commented 

 as follows: " Zur Bildung eines Spermatophores müsste aber dass 

 als männliches Individuum bei der Begattung fungirende Thier ein 

 besonderes Organ besitzen, und zwar müsste die Höhlung des 

 Peuis, der zweifellos das Sperma überführt, dazu eingerichtet 

 sein, was jedoch nicht der Fall ist." He is inclined to consider 

 that the receptacle secretion enclosing spermatozoa assumes an 

 aspect of spermatophore owing to conservation; while Woodwoeth 

 (100), though having no observation, was of the opinion that the 

 spermatophore is formed beyond boubt within the lumen of the 

 penis. Bergendahl (4, 5) judging from his observation of the 

 features of the spermatophore capsule in the receptacle of PL torva, 

 expounded the same view as Max Schultze. 



Subsequently, Micoletzkey (53) put forward a view that dif- 

 fers considerably from that of the preceding. He found in some 

 haematoxylin-eosin preparations of PI. (jonocej)hala that the re- 

 ceptacle secretion in immediate contact with the spermatophore 

 capsule stained red — i.e., was eosinophil, — though in mure remote 

 parts it was cyanophil, the red and blue grading over each other in 

 the intermediate parts, and was of the opinion that the secre- 

 tion changes from cyanophil into eosinophil during the process of 

 the capsule formation in that organ. 



Later, Weiss (92), after describing the occurrence of some 

 specious spermatophores and canals in the so-called uterus of PI. 

 striata and pointing out that the substance of the canalar wall is 

 very similar in nature to the eosinophil penis secretion found at 

 the tip of the penis in the genital atrium, noted down as follows: 

 "Dass sich bei der Copulation eine (oder einige?) aus dem Secret 



