Vorticellids, on Polychaeta, [299]

Vorticeros, British species, [45], [46], [50]

Vorticidae, [50]

Vuillemin (misprinted in text), on Nematodes in deserts, [156]

Walford, on Polyzoa, [521]

Ward, on Nectonema, [168];

on Sipunculus, [417]

Warning colours, in Polychaeta, [294], [314]

Waters, on Polyzoa, [517]

Wheeler, on Myzostomaria, [344]