by William Swainson, Zoological Illustrations Series II… (1829)
“ The group is chiefly distinguished by the very obtuse but regular termination of its spire, the whorls of which are never distorted or disproportionately inflated: the plaits are always four, and the pillar is never thickened in the middle: the shells of all the typical species are furnished with pointed tubercles ”
by William Swainson, Zoological Illustrations Series II… (1829)
“ Shell armed with spinous tubercles, sometimes smooth but never ribbed; spiral whorls gradually diminishing in size, but not distorted; the apix thick and obtuse; pillar with four plaits.Types of Form.—1. Marmorata. Broderpia. Sw. (Cymbiola. Sow.) 2. Vespertilio. Nivosa. Rutila. Aulica. Pulchra. Pacifica. 3. Elongata (?) Gracilis. Magnifica. Tuberculata. 4. ——? 5. Lugubris. Specific Character. Shell armed with spinous tubercles, pale fulvous with remote angular waved lines of brown; spiral whorls plaited ”
