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Genus Alcithoe H. and A. Adams.
Type: Buccinum arabioum Martyn.
Alcithoe familiaris Marwick. (Fig. 13).
1926. Alcithoe familiaris Marwick. Trans. N.Z. Inst., vol. 56, p. 29I, pl. 64, fig. 2.
Finlay (in Laws, Trans. N.Z. Inst., vol. 62, p. 202) has commented on this species as follows:—Marwick compared this species (known then only from the unique type, with the lower part of the body-whorl missing) with the Recent arabica, but commented on the different pillar plaits. The Ardgowan specimen collected by Mr Laws agrees exactly with the type, but is more complete, and shows that this species is not of the arabica style with long body-whorl and aperture, but is relatively short for so large a species. It
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also shows quite clearly that it is a direct ancestor of A. lutea Marwick (and probably A. transformis), having an identical build, columella, and development of sculpture, but much stronger spines on last whorl. The four rather low pillar plaits (with a weak fifth) are quite different in style from those of the wekaensis-cylindrica line.”
The Ardgowan specimen referred to by Dr Finlay is here figured.