 Gastropods with the radula absent or obsolete ; the operculum ovoid paucispiral, with the apex anterior, a thread-like arcuate ridge on the proximal side, the inner margin notched in harmony with the plaits of the pillar when prominent; foot short, moderately...  Proceedings of the Biological Society of Washington - Page vby Biological Society of Washington - 1905Full view - About this book
 | William Healey Dall, Paul Bartsch - 1909 - 486 lehte
...anterior, a thread-like arcuate ridge on the proximal side, the inner margin notched in harmony with the plaits of the pillar when prominent; foot short,...single branchia; verge subcylindric, elongate; head with two flattened subtriangular or elongate tentacles, connate, grooved or auriform in the larger... | |
 | United States National Museum - 1909 - 942 lehte
...anterior, a thread-like arcuate ridge on the proximal side, the inner margin notched in harmony with the plaits of the pillar when prominent; foot short,...single branchia; verge subcylindric, elongate; head with two flattened subtriangular or elongate tentacles, connate, grooved or auriform in the larger... | |
 | 1909 - 352 lehte
...anterior, a thread-like arcuate ridge on the proximal side, the inner margin notched in harmony with the plaits of the pillar when prominent; foot short,...single branchia; verge subcylindric, elongate; head with two flattened subtriangular or elongate tentacles, connate, grooved or auriform in the larger... | |
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