[253]

Porodiscus = Porous disk; πόρος, δίσκος.

[254]

Perichlamydium = Shell surrounded by a mantle; περί, χλαμύδιον.

[255]

Ommatodiscus = Disk with eyes; ὄμμα, δίσκος.

[256]

Stomatodiscus = Disk with openings; στόμα, δίσκος.

[257]

Xiphodictya = Net with swords; ξίφος, δίκτυον.