F. J. Meggitt 307 
The genital pore is much more anterior than is figured by him, lying in the 
anterior quarter of the proglottis; the genital cloaca is also much shallower, 
being only a small depression. The vagina consists of two separate parts. 
The first, muscular and with an extremely wide lumen, runs dorsally from the 
genital cloaca as far as the inner limit of the sacculus accessorius, there to open 
into a more muscular duct with no apparent lumen. This latter portion is 
spirally coiled, and runs ventrally and anteriorly to open into the receptaculum 
seminis. The difference between the two parts of the vagina is very marked. 
Of the two aporal testes, Fuhrmann (1906 a , p. 450) states “der vordere (liegt) 
aber etwas ausserhalb des hinteren antiporalen Hodens.” Preparations and 
sections showed this clearly. Though the two testes often appeared to lie one 
directly anterior to the other, yet in every case a projecting tongue from the 
anterior one lay external to the posterior, and a distinction between internal 
and external could be made. 
HYMENOLEPIS CORONULA (Dujardin, 1845). 
This cestode of ducks has been described by many authors, in particular 
by Wolffhiigel (1900, p. 165), but although most of its anatomy is well-known 
the following points have escaped attention. The specimens I received were 
taken from domestic ducks in Rangoon. 
The three testes (Pl. XVI, fig. 1, t.) are arranged as Fuhrmann (1906 a, 
p. /33) states, one poral and two aporal, the edges of the poral and the inner 
aporal testes touching in young segments but being gradually separated by the 
growth of the female glands between them. The arrangement of the two 
aporal testes varies according to the state of contraction of the segment; in 
proglottides extremely contracted, as in the one figured, the three testes are 
in the same straight line; in proglottides extended, one aporal testis lies 
anterior to and internal to the other. In all cases though, the outer testis 
has a small projection lying posteriorly to the inner, so that even when in 
the same straight line a distinction into anterior testes and posterior testis 
can be made. Wolffhiigel (p. 171) states, “Die drei Hoden erreichen bei 
Dicranotaenia coronula in hochster Reife eine solche Grosse, dass sie bis an 
die dorsale und ventrale Langsmuskulatur stossen.” This I have not found 
to be the case, the three testes lying well within the musculature. The cirrus- 
sac (c.s.) extends as far as, or just passes, the ventral longitudinal excretory 
vessel, and is two-thirds filled by the internal vesicula seminalis (v'.$'.), rather 
a larger proportion than figured by Wolffhiigel (PI. VII, fig. 103). The cirrus 
extending from this vesicula seminalis to the genital pore is straight and the 
small sacculus accessorius present is a straight tube of uniform diameter with 
no terminal enlargement; both these observations do not agree with the 
figure above mentioned. The external vesicula seminalis ( v.s .) is small, and 
spindle shaped, and lies dorsal and lateral to the receptaculum seminis. 
The female glands (PI. XVI, fig. 2) are posterior and ventral, and occupy 
one-third of the proglottis breadth. The bluntly lobed yolk-gland (y.g.) lies 
20—3 
