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Studies on Pedicidu)^ 
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leading into the vagina. Projecting from the ventral margin of the 
vaginal orifice, and visible through the aforesaid space, is a chitinous 
flap [v.Jl.) guarding the entrance. Folds of integument on either side 
of the orifice bear a number of fine long tactile hairs. 
Fig. 7. Perliculus hurnanus $. Posterior segments of the abdomen in ventral aspect. 
Drawing from a specimen treated with caustic potash and mounted. 
The vagina consists of a flattened purse-like sack, lying close to the 
ventral surface of the body; it measures about 0-5 mm. in depth and 
is covered on its dorsal and ventral inner surfaces by numerous minute 
