Strongylus, [129], [142], [143], [160], [163];

S. filaria, [132];

S. tetracanthus, [163]

Stuhlmann, on Polyzoa, [493]

Stuhlmannia, [359], [386]

Stylaria, [348], [377]

Stylets of Nemertine proboscis, [104], [110]

Stylochoplana, [18], [19], [20]

Stylochus, [19];

development, [28]