ammodytes (Vipera), [249]

Anal pockets, [83]

Anal shield, [17]

Ancistrodon, [261]

Ancistrodon halys, [262]

Antitoxic serums, [66]

Apical pits, [15], [75]

Arteries, [77]

Ascariasis, [111]

asianus (Zamenis gemonensis, var.), [173]