This screw fits neatly in the end of the box at passes loosely through the web-frame at e', is tapped into the frame at ?', and its end rests on a flat hardened surface at Rotation of the web-frame about /3y is prevented by the heads of the screws at m; the head of the screw on the lower side of the frame reposes on the plane vv, that on the upper side (fig.
Vv, Ventral vessel.
These septa are, however, rather incomplete and are not fastened to the gut; and, as in Acanthobdella, the nephridia are embedded vv FIG.
-- ??ol ltu Thph vv orzani.y„L'uu?aso s ??ls Lu-o.?
Coelomic space in Balano- vv, vessel.
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