The Atoll of Funafuti, Ellice group : its zoology, botany, ethnology and general structure based on collections made by Charles Hedley of the Australian Museum, Sydney, N.S.W.
Akera aperta, sp. nov
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. I am 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.