Transactions and Proceedings of the New Zealand Institute, 1927 [electronic resource]

Volume 57, 1927

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Key to Genera and Subgenera.
(1) Anterior lateral tooth or tubercle in left valve.
A. Lateral very strong, marginal crenulations fairly strong	Kuia
B. Lateral moderate to tubercular.
1. Hinge narrow, left median cardinal joined to anterior, right posterior cardinal extremely broad and deeply divided, lunule very large, pouting, marginal crenulations very fine	Marama
2. Hinge narrow, left median and anterior cardinals not joined, escutcheon well marked, posterior end abruptly truncated, right posterior cardinal much stronger than median, marginal crenulations very fine.	(Hina)
3. Hinge broad, right posterior cardinal not much stronger than median, anterior tubercle often obsolete, marginal crenulations fairly strong	Dosinula
(2) No anterior lateral tooth or tubercle in left valve.
A. Sculpture of thin, high, spaced, concentric lamellae.	Bassina
B. Sculpture of strong, recurved, spaced, concentric ridges	Clausinella
C. Sculpture of rather fine, rounded, sometimes crowded, sometimes spaced, concentric ridges	Tawera
D. Shell very small, sculpture of thin, spaced, concentric lamellae	Turia
E. Sculpture of low radial ribs crossed by irregular concentric lamellae	(Austrovenus)
F. Sculpture of fine, crowded, concentric lamellae, sometimes waved to produce fine radials, posterior marginal groove of right valve with a lateral tooth below it.	(Hinemoana)