52. Margarita fasciata, n. s.
M. testâ albidâ, creberrimè striatâ, purpureo fasciatâ, aperturâ argenteâ; long. 4⁄16; lat. 5⁄16 ferè; poll.
Habitat in Mari Pacifico. Mus. nost.
Portions of the striated surface are elevated into belts, which are of a purple colour.
53. Margarita violacea.
M. testâ sub-ovatâ, violaceâ, spirâ brevi; anfractibus tumidis; aperturâ iridescente; long. 7⁄16; lat. 8⁄16 fere; poll.
Habitat ad fretum Magellanicum. Mus. Brit., nost., Brod.
Of this shell the Indians make their necklaces; it is found adhering to the leaves of the Fucus giganteus, and is the principal food of the Steamer or Racehorse Duck (Micropterus Patachonicus, nob. in Proceedings of the Zoological Society, December 14, 1830, page 15).
54. Margarita cœrulescens.
M. testâ sub-complanatâ, cœruleâ, striatâ, albido-lineatâ, aperturâ iridescente; lat. 13⁄16 ferè; long. 15⁄16; poll.