[348]

Tholospira = Shell with spiral domes; θόλος, σπεῖρα.

[349]

Spironium = Shell with spiral structure; σπειρώνιον.

[350]

Streblonia = Screw-shell; στρεβλώνιον.

[351]

Streblacantha = Screw-shell with spines; στρέβλη, ἄκανθα.

[352]

Streblopyle = Screw-shell with gates; στρέβλη, πύλη.