Semicassis labiata (Perry, 1811)
=Cassidea labiata Perry, 1811, =Cassis achatina Lamarck, 1816, =Phalium (Xenogalea) labiatum (Perry, 1811), =Phalium labiatum (Perry, 1811), =Semicassis (Semicassis) labiata (Perry, 1811), =Semicassis labiata iheringi (Carcelles, 1953), =Semicassis labiata labiata (G. Perry, 1811), =Xenogalea collactea Finlay, 1928, =Xenogalea insperata Iredale, 1927
Height 83mm, Width 52mm, Marine
Northern part of North Island to Mahia. Victoria to Queensland and Norfolk Island AC

Semicassis pyrum (Lamarck, 1822)
=Cassidea multisecta Finlay, 1924, =Cassidea stadialis Hedley, 1914, =Cassis nivea Brazier, 1872, =Cassis pyrum Lamarck, 1822, =Cassis striatus Hutton, 1873, =Cassis tumida Petterd, 1886, =Phalium pyrum (Lamarck, 1822), =Phalium stadiale (Hedley, 1914), =Semicassis (Semicassis) pyrum (Lamarck, 1822), =Xenogalea denda Cotton, 1945, =Xenogalea finlayi Iredale, 1927, =Xenogalea halli Cotton, 1954, =Xenogalea mawsoni Cotton, 1945, =Xenogalea powelli Finlay, 1928, =Xenogalea pyrum (Lamarck, 1822), =Xenogalea spectabilis Iredale, 1929, =Xenogalea stadialis (Hedley, 1914), =Xenogalea wilsoni Cotton, 1954, =Xenophalium (Xenogalea) abernethyi Dell, 1956, =Xenophalium (Xenogalea) matai Powell, 1952, =Xenophalium abernethyi Dell, 1956, =Xenophalium finlayi (Iredale, 1927), =Xenophalium hamiltoni Powell, 1928, =Xenophalium harrisonae Powell, 1928, =Xenophalium matai Powell, 1952, =Xenophalium pyrum (Lamarck, 1822), =Xenophalium pyrum pyrum (Lamarck, 1822), =Xenophalium wanganuiense Powell, 1928
Height 85mm, Width 55mm, Helmet Shell, Marine
North, South, Stewart and Chatham Islands ACFM

Semicassis royana (Iredale, 1914)
=Cassidea royana Iredale, 1914, =Semicassis (Semicassis) royana (Iredale, 1914) accepted, alternate representation, =Xenophalium ericanum Powell, 1928, =Xenophalium hedleyi Iredale, 1927
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)
=Cassis sophia Brazier, 1872, =Semicassis (Semicassis) sophia (Brazier, 1872) accepted, alternate representation
Height 90mm, Width 55mm, Marine
Northern. Off Northland east coast. Also Queensland to New South Wales and Kermadec Islands KA

Semicassis thomsoni (Brazier, 1876)
=Cassis (Casmaria) thomsoni Brazier, 1876, =Cassis thomsoni Brazier, 1876, =Semicassis (Semicassis) thomsoni (Brazier, 1876) accepted, alternate representation, =Xenogalea thomsoni (Brazier, 1876), =Xenogalea thomsoni palinodia Iredale, 1931
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