[263]

Amphymenium = Shell with veil on both sides; ἀμφί, ὑμήνιον.

[264]

Amphirrhopalum = Shell with clubs on both sides; ἀμφί, ῥόπαλον.

[265]

Amphicraspedum = Shell with borders on both sides; ἀμφί, κράσπεδον.

[266]

Dictyastrum = Reticulated star; δίκτυον, ἄστρον.

[267]

Rhopalastrum = Club-star; ῥόπαλον, ἄστρον.