. Bulletin of the British Museum (Natural History) Geology Supplement. FROM NORTHWESTERN EUROPE 33 Description. External characters. L. vaga is weakly trilobate with a low, symmetrical uniplication in the anterior commissure. The brachial is the more inflated valve and the species is generally characterised by a rather globose appear- ance. Concentric ornament is only rarely present and consists of weak growth lamellae and numerous fine growth lines. The beak is typically small and sub- erect ; conjunct deltidial plates delimit the small submesothyridid pedicle opening. Beak ridges and an inte
. Bulletin of the British Museum (Natural History) Geology Supplement. FROM NORTHWESTERN EUROPE 33 Description. External characters. L. vaga is weakly trilobate with a low, symmetrical uniplication in the anterior commissure. The brachial is the more inflated valve and the species is generally characterised by a rather globose appear- ance. Concentric ornament is only rarely present and consists of weak growth lamellae and numerous fine growth lines. The beak is typically small and sub- erect ; conjunct deltidial plates delimit the small submesothyridid pedicle opening. Beak ridges and an interarea are present but only poorly 2 5. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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