On the structure of Taenia oonfusa Ward. 477 



these both male and fciuale Systems are well developed, and by means 

 of sections their structure and relationsbii) may readily be made out. 

 As is the case in kiudred forms the male organs occupy largely one 

 surface of the body and thus provide means for distin^uishinfi: dorsal 

 and ventral side. Following the well established precedent, the side 

 bearing the testes (Fig. 4 t) is designated as dorsal, 



Male System. 



Testes. The testes (Fig. 3 t) are present as nunierous more 

 or less round bodies distributed throughout the entire upper field of 

 the Segment between the excretory vessels, with the exception of a 

 limited area just anterior to the ovariau lobes. They are more abund- 

 ant toward the borders and anterior end of the inner field. They 

 seem to ditler little froni those of T. saginata except for their smaller 

 size (0.089 to 0.096 mm in diameter). No vasa efferentia are visible 

 but this fact is due i)robably to the poor histological condition of 

 the material. 



Vas deferens. This organ (Fig. 3 and 4 v.d) is present as a 

 greatly coiled tube whicli extends from the genital pore in a line at 

 right angle to the antero-posterior axis of the proglottid, and ends 

 near the center of the segment. The coiling is very pronounced and 

 romplicated, and occupies a Space from 0.13 to 0.16 mm wide. This 

 area has a sheath-like boundary formed principally of surrouuding 

 muscle fibres. The tube itself measures about 0.045 mm in diameter 

 but becomes smaller beforc it enters the cirrus pouch whcre it again 

 Springs abruptly to a greater diameter forming a special enlargement 

 for storing the innumerable spermatozoa with which it is filled. Therc 

 are usually from one to three of these bulb-like swellings, which 

 form a sort of Vesicula scminalis. 



Vesicula seminalis. This structure (Fig. 6 v.s) seems to 

 be modified in no way particularly from the remainder of the Vas 

 deferens, except for the enlargement of the cavity. The diameter of 

 the enlargement varies somewhat in ditferent proglottids, and slightly 

 in the ditferent bulbs, where more than one are present. In general 

 the diameter is about 49.7 u. The increase in size seems to be prin- 

 cipally dorso-ventral, cousequently the bulbs can be seen iu'^transverse 

 sections to the best advantage. They are present in all the trans- 

 verse sections through the pore but in several series of frontal sec- 

 tions they appeared to be lacking until their presence was proven by 

 means of measurements. In a few cases therc seemed to be no trace 



