In the typical species the callus joining the outer and inner lip across the body whorl is black. A similar shell from the mainland at Port Glasgow, and recorded by Smith from Millport Harbour, many years ago, is larger and more conical, measuring 38 mm. broad by 33 mm. high, while the type measured 28 mm. broad by 24 mm. high. This may be named Letitia adjuncta sp. nov. Hedley recorded specimens from Milne
Bay, Papua, and these are broadly conical shells, in which the blackish-red outer lip is separated from the similarly coloured columella by a thin white glaze on the body whorl. This may be named L. interrupta sp. nov., the type measuring 37 mm. in breadth by 29 mm. in height. A series collected on Moturina, one of the Calvados Chain, Louisiades, by the Rev. H. K. Bartlett, consists of smaller shells, more depressed and with a thickened blackened outer lip and columella, boldly interrupted by white on the body whorl, and may be called L. moturina sp. nov., the type measuring 31 mm. broad by 22 mm. high.