Vineyard Snail 
Waved goblet 
Wavy Volute 
Waxy Glass Snail 
White Italian snail 
White nut sheath bubble 
White-and-orange-tipped Nudibranch 
White-lipped snail 
White-margin sea slug 
White-speckled Seahare 
Willan's Chromodoris 
Willey's Halgerda 
Winding Mantleslug 
Winged Argonaut 
Wunderpus photogenicus 
Xerocrassa seetzeni 
Yamasu's Cuthona 
Yellow slug 
Yellow-bordered Taildropper 
Yellow-shelled Semi-Slug 
Zachrysia provisoria 
Zebra mussel 
Zebra Top Snail 
Zebra Wing Oyster