Mitrella fusca is small, and of great rarity; our own specimen, beautifully perfect, is the only one we have yet seen.
MITRELLA ocellata.
Shell whiteish, the lower half of the principal whorl brown, with a band of alternate rufous and white spots, and marked with reticulated white lines, and remote sulcated striæ, internally punctured; spire, and upper part of the body whorl, delicately plaited, the plates crossed by transverse lines of excavated dots.
This species has probably been overlooked as a variety of M. Fissurella; its markings, indeed, are partially the same, but its sculpture, and even its form, proves it to be distinct. The alternate white and rufous spots bear a fanciful resemblance to eyes. The description of M. Olivæformis has already been given at Pl. 48, in the first volume of our former Series.
Pl. 55.
MARGARITADÆ Pl. 1
Margarita crocata.
