Nematoda, [111]

Nerodia, [152]

Nervous system, [73]

neumayeri (Cœlopeltis monspessulana, var.), [210]

niger (Coluber longissimus, var.), [188]

nigrescens (Tropidonotus tessellatus, var.), [162]

Nocturnal Snakes, [93]

Northern Viper, [230]

Nostrils, [13], [74]