[248]

Stauractura = Cruciform shell with four rays; σταυρός, ἀκτίς, ὀυρά.

[249]

Pentactura = Stellated shell with five rays; πέντε, ἀκτίς, ὀυρά.

[250]

Echinactura = Echinus-like shell with five rays; ἐχῖνος, ἀκτίς, ὀυρά.

[251]

Archidiscus = Primordial disk; ἀρχιδισκος.

[252]

Axodiscus = Disk with certain axes; ἄξις, δίσκος.