Neosilurus, [588]

Nephridia, of Amphioxus, [125]

Nephrostomes, [398];

persistent, [401]

Nephrotome, [397], [398]

Nerophis, [634], [635]

Nerve eminences, [383]

Nervous system, of Chordata, [4];

of Hemichordata, [9], [25], [30];

of Tunicata, [53], [58], [66];