Later sections were also roofed, generally with an arch to oviform. They are evergreen compact epiphytes with upright, narrow, oviform leaves. The original tunnel is of a single line brick oviform construction. The aqueduct is considered unique in Australia for its riveted oviform steel carrier. The Bondi Sewer is oviform in shape and was constructed from brick. One of only a few oviform outfalls, but the only one discharging into the ocean. As a result, several globular and oviform species have been transferred to the genus "Netzelia". The thick shell is oviform to fusiform, with a short (sometimes sunken) conical apex.