410 MR. H. A. BAYLIS ON A 
In the scolex fine canals can be seen running up to open by 
the peculiar slit-shaped apertures on the apical projection. 
Genital Organs.—The testes are proportionately large, com- 
pared with those of other species of the genus, and are also 
remarkably few in number. ‘They are nearly spherical, and have 
a diameter of about 0°055 mm. ‘They are situated in the dorsal 
part of the central field of the proglottis, and arranged on a 
horseshoe plan round the other organs, which occupy the centre 
and more ventral parts. The two ends of the horseshoe are 
directed towards the right side of the animal, on which the 
genital pores are always situated, and the male and female genital 
ducts pass between them. 
Text-figure 3. 
py Te Re yl, 
Tetrabothrius. strangulatus. 
A. Transverse section through a sexually mature segment. 
D.v., Dorsal excretory vessel; G.A., genital atrium; ., outer, M’., inner, longi- 
tudinal muscles; IV., lateral nerve: Ov.,ovary; Ve., testes; V.D., vas deferens ; 
Vit., vitelline gland; V.V., ventral excretory vessel. 
B. Horizontal section through a gravid segment. 
B.S. Receptaculum seminis; 7.V., transverse excretory vessel; Ut., uterus. 
