46 
Tapeworm from a Parakeet 
anteriorly, they increase in size, and in the scolex are relatively large. 
They are never as numerous and occupy as much room as those 
described for the other species of this genus. In the scolex, a number 
of the longitudinal muscles bend outwards and, splitting at their distal 
ends, attach themselves at several places to the inner surface of the 
suckers: in this way the suckers are covered with a fine muscular 
network internally. The majority however proceed anteriorly without 
touching the suckers and attach themselves to the outer margin of the 
rostellum: a few run more internally and become fixed to the corre¬ 
sponding margin of dhe rostellar core. 
Excretory System. 
The excretory system (Text-fig. 3) consists of the usual four longi¬ 
tudinal vessels running the whole length of the strobilus and following 
Fig. 3.—Reconstruction of the excretory system in the scolex. ex. Anterior excretory 
commissure, l.v. Longitudinal excretory vessel, s. Branch of excretory vessel to 
suckers, t.c. Transverse excretory commissure. 
