A Treatise On Zoology volume 5
A Treatise On Zoology volume 5
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FAMILY 5. LIMAPONTIIDAE, Adams. No lateral expansions of the body and no dorsal papillae ; body planariform ; anus dorsal, median, and posterior. Genera Limapontia, Johnston ; no tentacles ; head and body devoid of crests ; British. Actaeonia, Quatrefages ; head carinated laterally ; British. Cenia, Alder and Hancock ; head with two long tentacles (Fig. 170).
ORDER 2. Pulmonata, Cuvier.
Euthyneura with a pallial cavity but no ctenidium. The pallial aperture is diminished by the fusion of the ma...ntle border with the neck, and reduced to a comparatively small contractile orifice at its posterior extremity (Fig. 177, V). The pallial cavity and shell are 182 THE GASTROPODA often reduced ; the latter may be partially covered over, or interral, or even absent. There is never an operculum in the adult, except in Amphibola, and an operculum is only found during development in the Auriculidae, Siphonariidae, and Oncidiidae, all of which are marine forms. In the pallial cavity the interior wall of the mantle is traversed by vascular arborisations (Fig.
What to read after A Treatise On Zoology volume 5?
You can find similar books in the "Read Also" column, or choose other free books by E Ray Edwin Ray Lankester to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
FAMILY 5. LIMAPONTIIDAE, Adams. No lateral expansions of the body and no dorsal papillae ; body planariform ; anus dorsal, median, and posterior. Genera Limapontia, Johnston ; no tentacles ; head and body devoid of crests ; British. Actaeonia, Quatrefages ; head carinated laterally ; British. Cenia, Alder and Hancock ; head with two long tentacles (Fig. 170).
ORDER 2. Pulmonata, Cuvier.
Euthyneura with a pallial cavity but no ctenidium. The pallial aperture is diminished by the fusion of the ma...ntle border with the neck, and reduced to a comparatively small contractile orifice at its posterior extremity (Fig. 177, V). The pallial cavity and shell are 182 THE GASTROPODA often reduced ; the latter may be partially covered over, or interral, or even absent. There is never an operculum in the adult, except in Amphibola, and an operculum is only found during development in the Auriculidae, Siphonariidae, and Oncidiidae, all of which are marine forms. In the pallial cavity the interior wall of the mantle is traversed by vascular arborisations (Fig.
What to read after A Treatise On Zoology volume 5?
You can find similar books in the "Read Also" column, or choose other free books by E Ray Edwin Ray Lankester to read onlineMoreLess
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