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Genitalia of (Ancistrocephalus) polypteri. 257 
The chain, taken as a whole, showed certain peculiarities. 
Certain stretches of proglottides were narrow and long, 
These were followed by “island ’’-like broad stretches, where 
the segments were shorter and more numerous—two to three 
Fig. 2. 
Uterine 
Anterior 
Uterus 
| (full of eggs): 
Fig. 3; 
Anterior 
pore. 
pore. 
(with eggs). 
Ovary. 
cae 
ESE) 
PTS 
Posterior. 
to the militmetre. Generally the segments were 1 mm. long. 
In the “ripe” proglottides the dorsal surface was convex and 
the ventral flat—a condition brought about by the bulging 
uterus. 
Internal Anatomy. 
The specimens were stained in hematoxylin. A few 
transverse sections were made. In both cases, however, the 
greatly developed uterus obscured most of the structures. 
