Genus Scaphander Montfort.
Type (o.d.) : Bulla lignaria Linné.
Scaphander hiulca n.sp. (Figs. 83, 84).
Shell small, fragile, wide in front, narrower behind, not umbilicate. Spire involute. Body-whorl embracing all earlier volutions. Aperture narrowly channelled behind, effuse in front (outer lip broken). Parietal callus thin. Columella very long, thin, arcuate. Sculpture of very numerous, flat, wavy, spiral cords often arranged in pairs, and coarser and more widely spaced on posterior half of shell: interspaces flat-floored, of rather unequal width. There is a very distinct, broad depression on shoulder encircling posterior end of the body.
Height, 7.0 mm. width (estimated), 4.1 mm.
Type (sole specimen) in writer's collection.
Easily distinguished from S. scapha Laws, which otherwise it simulates closely, by the depressed zone at posterior of body. Also the outer lip projects more behind and the columella is longer and much less arcuate. S. malleatus Marwick has straight sides and the columella very much shorter and strongly excavated.
This is the third species recorded from New Zealand, though several undescribed Oamaruian fossils are known. So far as the writer knows it is the only occurrence of the genus in post-Miocene rocks in New Zealand. It has close alliance with S. scapha from Awamoan beds in the South Island.
There are a half-dozen more or less fragmentary specimens. No attempt has been made to determine them specifically. This is a new record for the locality. A number of new species from South Island Oamaruian beds await description.
Specimens in writer's collection.