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Platybdella Anarrhichae 
The female reproductive organs consist of a pair of ovaries, which, 
unlike those of Calliobdella, instead of almost fusing in the median line, 
are lateral in position. In contradistinction to the testes which are 
abnormally large, the ovaries are so small that in several of the first 
leeches I cut they eluded my observation altogether. At first I was 
inclined to attribute this to the time of year when the leeches were 
caught (January), yet the same leeches showed an abundance of fullv 
Fig. 11. Platybdella anarrhichae. Median longitudinal section, through the clitellar 
region. Diagrammatic since an ovary (which is not median) would not occur in the 
same section as the female genital aperture, oe. oesophagus; n. nerve cord; m.g. male 
genital aperture; f.g. female genital aperture; p. penis; b. bursa; od. oviduct, the 
coiled portion represented by dotted lines; v.s. vesicula seminalis with developing 
spermatozoa; ov. ovary; v.d. vas deferens; d.e. ductus ejaculatorius. 
developed and developing spermatozoa in their vesiculae seminales. 
Some of the leeches when caught had the penis extruded. If copulation 
takes place at this time of the year, then the presence of true vesiculae 
seminales would be expected. 
The ovary appears as a local development on the wall of a large 
cavity from which the oviduct arises. It is just possible that this 
cavity acts as a receptaculum seminis (Fig. 11). The oviducts are 
