The royal natural history . larva OF Entoconcha (much magnified).. Acera bullata (twice nat. size). Acera bullata, which occurs on oozy ground and mud-flats in many estuaries. Italso ranges from Finmark to the Mediterranean; and is remarkable for its thin,horny,convolute shell, with a slit at the suture, through which the animal protrudes along, thread-like mantle-appendage. The side-lobes are largely developed, andcan be reflexed so as to completely envelop the shell. They are also employed inswimming. Another family is represented by Ringicula, all the members ofwhich are very small, not a q
The royal natural history . larva OF Entoconcha (much magnified).. Acera bullata (twice nat. size). Acera bullata, which occurs on oozy ground and mud-flats in many estuaries. Italso ranges from Finmark to the Mediterranean; and is remarkable for its thin,horny,convolute shell, with a slit at the suture, through which the animal protrudes along, thread-like mantle-appendage. The side-lobes are largely developed, andcan be reflexed so as to completely envelop the shell. They are also employed inswimming. Another family is represented by Ringicula, all the members ofwhich are very small, not a quarter of an inch in length. The shells are entirelywhite, more or less globular, with a pointed spire, and with the aperture—which isnotched in front—to some extent contracted with folds. The channelled characterof the aperture is rather exceptional, the shells of the Tectibranchs being almost GASTROPODS. 363 exclusively holostomatous, that is, with uninterrupted apertures. Gastropteron, which typifies another family, is remarkable for the great lateral exp
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectzoology
