Vatides, [259]

Vas deferens, [18], [140], [187], [392]

Vayssière, on nymphs of Ephemeridae, [434];

on lingua, [438]

Veins, [206]

Ventral chain, [116], [187], [414];

of Perlidae, [404]

Ventral plate, [148];

tube, [191], [192]

Verhoeff, [38]