THE MOLLUSCA—HEDLEY. 423 
from eight to sixteen, spiral brown threads. 
These lines sometimes coalesce and produce a 
colour pattern of opaque white blotches on 
a dark chestnut ground. The opaque white 
spaces vary in number and extent; when re- 
stricted they appear as a series of rhombs 
on the periphery and triangles on the suture ; 
by confluence these form longitudinal ragged 
stripes and separate the barred or brown 
tracts into rough ovals. This colouration is 
visible within the aperture. Sculpture— 
longitudinal growth lines are perceptible ; 
the whole body whorl is evenly spaced by 
about a dozen, wide, very shallow grooves, upon the narrow in- 
tervening ridges of which are apt to occur the chestnut bars ; the 
peripheral groove is the most distinct. Whorls seven, gradually 
increasing, slightly rounded ; embryonic whorl one, minute, tur- 
binate. Suture deeply impressed. Aperture slightly oblique, 
ovate, pointed posteriorly, rounded and effuse anteriorly ; colum- 
ella reflected, stained medially with chestnut ; callus on body 
whorl slight, outer lip straight, simple. Operculum thin, corneous, 
ovate, paucispiral. Length 27, breadth 14 mm. 
Very abundant ; alive on stones and shells in shallow water in 
the lagoon. 
This species differs from D. albugo, Watson, and D. ludens, 
Melvill and Standen, by a dull instead of a glossy surface, and 
by the opaque tracts occurring in larger continuous sheets instead 
of being scattered in small and numerous dots. 
Fig. 14. 
From the description of Rissoa flammea, Pease,* I suppose that 
it is either the same or very like the shell before me. 
DiAta HARDYI, Melvill & Standen. 
Melvill & Standen, Journ. Conch., viii., 1895, p. 118, pl. ii, 
fig. 10. 
This species is common in the lagoon. I have identified it with 
a species I took at Panie, New Caledonia, which answers to the 
account of the Lifu shell. 
SoLARIUM HYBRIDUM, Linne. 
Tryon, Man. Conch. ix., 1887, p. 14, pl. v., figs. 59 - 62. 
A dead example from the lagoon beach. 
Recognised by Melvill and Standen from Lifu, by Schmeltz 
from Samoa, Tonga, and Cook’s Islands, and represented in this 
Museum from Teste Island, Louisiades. 
* Pease—Am. Journ. Conch., iii., 1867, p. 297, pl. xxiv., fig. 33. 
