41 
Blase* (Figs. 4 and 5).“ The description seems somewhat am- 
biguous; particularly after a comparison with the text-figures. The 
oviducts, i. e. the two uteri, should terminate „above the posterior 
limits of the penis“. In the term penis Woodworth seems to include 
also the prostate vesicle, for he says: „There is a large muscular 
penis enclosing a spacious prostate giand („Kbrnerdruse“), „and 
further on“, the ciliated ductus ejaculatorius extends along the ventral 
wall of the penis, at the posterior end of which it divides into two 
vesiculae seminalis“. In both cases the word posterior that I have 
italicized doubtlessly means anterior or proximal!! Regarding the 
interpretation of the vesiculae seminales, I refer to Meixner (1907, 
p. 141). When Woodworth in the first quotation above speaks of 
the vagina, which from „now on., passes forwards 
and downwards over the penis“, he apparently includes the „ductus 
ejaculatorius* {— the median limb of the three-lobed vesicula 
seminalis), in order that the description may coincide with the 
diagrammed median section (Woodworth’s fig. 5). With the aid of 
Woodworth’s description and his two figures, Meixner has recon- 
structed a median section of the copulatory organs in Idioplana 
(1907, Taf. XXVIII, Fig. 2). The splendid agreement with Wood¬ 
worth’s figures admits no criticism. However, I may be permitted 
to doubt whether or not Woodworth has correctly reproduced the 
actual termination feature of the uteri. First of all, one would 
expect that, when Lang’s glandular vesicle is present, the vagina 
would receive one unpaired median uterine duet instead of both 
uteri direetly, and, secondly, it seems very improbable to me that 
the vagina is entered in its ventral part by the uterine duet. It 
contradicts the general organization of the vagina tn the acotylean 
Polyclads, and especially in Stylochidae, where the proximal part 
of the vagina, if Lang’s glandular vesicle is present, curves forward 
after it has received from beneath the median uterine duet. There- 
fore, in my opinion, it seems likely that Woodworth has overlooked 
the median uterine duet and has teen misled by the two distal 
ends of the uteri, which tend to approach the median line, and 
which, of course, lie near and above the ventral limb of the vagina*). 
*) The section of a canal that is seen on Woodworth’s fig. 5, to the left of the 
downward bend of the vagina (Meixner interprets this bend as uterus 
dexter) and above the rostral border of the prostate giand is probably a 
