Semicassis royana (Iredale, 1914) Height 150mm, Width 80mm, Marine Off Three Kings to Northland east coast, in craypots around 40 metres. Also off Kermadec Islands KA
Semicassis sophia (Brazier, 1872) Height 70mm, Width 50mm, Marine Northern. Off Northland east coast. Also Queensland to New South Wales and Kermadec Islands KA
Semicassis thomsoni (Brazier, 1857) Height 80mm, Width 55mm, Marine. Distinguished by the deeply indented margin of the columellar shield Off east coast Northland to Bay of Plenty, New Zealand. Also Australia A
Key to Geographical Ranges
The symbols K.A.C.F.M.An. are used to indicate the geographical range of the species.
They have been adopted to give an approxomation of the range of each species within New Zealand.
Aupourian - Kaipara Harbour, north around North Cape, encompassing the Three Kings Islands and south to East Cape
Cookian - Lower North Island and the northern part of the South Island