Ampullaria, Temnocephala with, [53]

Anachaeta, [350], [376], [395]

Anal, cirri, [259];

funnel, [259], [332], [333];

vesicles, [358], [436]

Anangian worms, [253]

Anarthropora, [529]

Ancylostomum, [143], [163]

Andrews, on Sipunculus, [417], [426]

Angiostomum, [134]