34 Mr. Swainson on the Characters 
each yolution; leaving between them and the suture an open chan- 
nel; at the base of the shell are deep striee, which cross the ribs, 
and produce a rough granulated surface. The ground of the 
shell is pale flesh colour, crossed on the ribs by bands of short 
slender fulyous lines; interspersed by a few orange spots: the 
aperture is also flesh-coloured, and the margin of the outer lip 
sharp and rather inflected. The upper part of the columella is 
crossed by numerous slender plaits, and at the lower part are three 
others much larger. 
Described from a specimen in the possession of Mr. Mawe. 
0b. 1. The V. festiva of Lamarck, except from his description, is 
a species unknown to me. According to the writer, it differs from 
V. costata in being fusiform and ventricose, resembling in shape 
V. magellanica; it likewise appears destitute of the numerous 
small plaits on the columella, and of the obtuse coronations, 
formed by the summit of the ribs. These two shells with V, nucleus 
Lam. (which is Voluta harpa of Mawe’s Introd.) V. mitreformis, 
and another undescribed species in my possession, constitute a 
new group in the genus; characterized by having the principal 
plaits on the pillar, situated at the base of the aperture. 
Ob. 2. It may be necessary to observe, that although two shells 
already appear in the Linneean classification under the name of 
voluta costata, neither of them in fact, belong to this genus.as it 
now stands, One of these (the voluta nassa of Gmelin,) is a young 
shell of a species of Nassa Lam.; the other, (Vol. costata of Gmelin 
and Dillwyn,) is the Mitra Subulata of Lamarck. 
Mirra. Lam. Cuyv. 
Mirra tessellata, 
M. testa ovata, leevi, striis transversis remotis et punctis, al- 
bente, lineis fulvis transversis et longitudinalibus cancellata, labii 
interioris basi fusca; labio exteriore leevi. 
Shell ovate, smooth, with remote transverse punctured strie; 
whitish, cancellated by transverse and longitudinal fulyous lines; 
inner lip brown at the base, outer lip smooth. 
DrscriPrion. 
Habit of Mitra pertusa, but is much smaller in size, and less 
