182 
vex over the shell. Foot flat, straight and dilated in front, 
sides approximately parallel, terminating in a blunt point, 
the free tail nearly one-half the whole length : projects beyond 
the mantle border anteriorly when in motion : it is horizont- 
ally slit in front. Eyes, distinctly discernible as little 
black beads on the outer bases of tentacles, which are not 
retractile. Genitalia, situated far anteriorly on the right, 
immediately adjacent to the trunk of the head. Colour : 
The dorsal shield of the unique specimen is of a uniform, 
dull, brick-red or vermilion colour, with an imperfectly 
stellate, four-lobed, opaque white crown in its centre, and 
three additional white blotches on the right side, all of the 
white markings being easily removed by abrasion : its under 
surface is yellow at the border, grading to vermilion, thence 
to an impure white in the region adjoining the foot. Head 
and foot shaded brownish yellow. Dentition : Formula 
|:!;1: central plate sub-trigonal; laterals large, their spines 
overlapping in the central line. Dimensions: Length, 33; 
breadth, 25 ; height, 12 mm. 
Shell. — Auriform, moderately convex, about three and 
a half whorls : margin of lip with a shallow concavity ante- 
riorly : ornamented with distinct incremental striae and very 
faint spiral incisions, the latter hardly recognisable with the 
unaided eye : open underneath, exposing the whorls ; invested 
with a thin, transparent yellowish epidermis. Colour shining 
white, spire and inside nacreous. Dimensions : Major axis, 
2H : minor axis, 16^ : height, 9 mm. 
^ff/^.— Backstairs Passage, St. Vincent Gulf. Dredged 
in 25 fathoms. 
Ohi<. — The shell of 7>. ojihione, Gray, is much like that of 
L. ai/Jifralin, though smaller, with its body whorl more con- 
vex, spire smaller and apex less central : no authentic descrip- 
tion or figure of the animal has, however, come to hand. Pro- 
fessor F. W. Hutton has taken a mollusc in New Zealand 
which he considers in all probability to be /.. ophinne, of 
Gray.* It clearly differs in one respect from my species. 
Whereas the dorsal shield of T.. avsfrali^ is smooth or minutely 
granulated, that of the specimen taken by Profesor Hutton 
is smooth, but much wrinkled, resembling convolutions of the 
brain. 
Genus Caledontella, Souverbie, 1869. 
Animal. — Body ovoid. Dorsal shield thick, ample, ver- 
rucose, with its edges tucked in along the sides, and, in a con- 
tracted state, completely enclosing the foot : notched an- 
teriorly and produced to an imperfectly closing siphon, re- 
* Manual New Zealand Mollnsca, p. 59. 
