.i, and Point Slade
(Latitude 21 degrees South Longitude 149 degrees 20 minutes East).
The spiral striae that cross its whorls are grouped in pairs; their
interstices are raised, and more or less finely crenulated; as they pass
out on the expanded and wing-like varices they diverge, and the lobe-like
projections that scallop the margins of the wings are separated from each
other by each pair of diverging striae. The fine ribs that cross the
whorls are not present on the wings, nor on the back; they are nodulated
at their decussation with the raised striae. The wing-like varices of the
whorls overlap each other alternately on each side of the shell. The only
species to which it has affinity is the R. pulchra.
Scalaria jukesiana. Tab. 3 fig. 7.
Testa lanceolato-turrita, gracilis, alba, laevis, nitida,
longitudinaliter costata, costis lamellosis, reflexis, simplicibus,
nnmerosis (in ult. anfrac. 20); anfractus 11, tumidi; sutura profunde
impressa; varices nulli; apertura orbicularis, margine laevi. Long. 13,
Diam. max. 14, apert 3 mill. (Mus. Brit.)
This beautiful little Scalaria is deserving of particular notice on
account of the analogy and representation which it exhibits with the S.
clathratulus of the seas of the Northern Hemisphere. It is dedicated to
the author of the Voyage of the Fly.
New Genus--MACGILLIVRAYIA, Forbes.
Shell spiral, dextral, globular, thin, corneous, transparent (in the only
known species smooth or marked by obscure lines of growth) imperforate;
spire not produced (with a sinistral nucleus ?). Aperture oblong, entire,
angulated below; peristome incomplete, thin, even-edged.
Operculum semicircular, horny, thin, composed of concentric layers with
faint traces of a spiral structure at the centro-lateral nucleus, which
is on the columellar side; from it there runs a strait rib or process
continued nearly to the outer margin, and indicated externally by a
depression or groove.
Animal ample, provided with four very long and rather broad linear rugose
(or ciliated ?) tentacula; mantle produced into a long siphon; foot very
large, expanded, truncate in front, bearing the operculum near its
posterior extremity, but not accompanied by filamentous processes or
lobes. A float. (Mus. Brit. and Geol.)
This very remarkable mollusk was taken in the towing net off Cape Byron,
on the east coast of Australia, in latitude 28 degrees 40 minutes South,
fifteen miles from the shore. It was floating an
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