THE MOLLUSCA—HEDLEY. 485 
HAMINEA VITREA, A. Adams. 
Pilsbry, loc. cit., p. 370, pl. xl., fig. 83. 
Two specimens from the lagoon beach. 
The “ Chevert” Expedition took this species in Torres Straits. 
It occurred to me at Panie, New Caledonia; and under the 
synonym of H. tenera, A. Adams, Melvill and Standen record 
it from the Loyalties. 
CYLINDROBULLA scuLpTa, WVevill. 
Pilsbry, loc. cit., p. 381, pl. xlii., figs. 36 - 38. 
Two living specimens from shallow water in the lagoon, corres- 
pond fairly to the above quotation. This Cingalese species has 
not been noticed before in the Pacific. 
AKERA APERTA, Sp. nov. 
(Fig. 47). 
Shell small, fragile, transparent, oval. 
Whorls two and a half, last sloping on the 
shoulder, then subangled and rounded 
below; sculptured by close, regular growth 
lines. Apex truncate. Spire minute, 
visible through a flat, glossy plate, which 
continues into a rib bordering the sutural 
notch. Aperture as long as the shell, 
much dilated and effuse below, narrowed 
above to the broad and deep sinus ; outer 
lip arched forward above the middle ; 
columella very concave with a narrow 
sharply reflexed edge. Length 5, breadth 
4 mm. 
Three specimens from sand on the 
lagoon beach. 
This curious shell agrees with Akera in 
having the spire at the vertex and in the 
open aperture, but it approaches Cylin- 
drobulla in the more involute spire. Jam 
not satisfied that this may not be the 
young of the preceding species, but as no 
information is published on the immature 
stages of these genera, it seemed well to 
describe my material, even at the risk of 
increasing synonomy. 
HyYDATINA AMPLUSTRE, Linve. 
Pilsbry, Joc. cit., p. 390, pl. xliv., figs. 1 — 6. 
An immature specimen from the lagoon beach. 
