The royal natural history . common pond-snail (Limncca other known form, although some of the South American types approximateclosely. When disturbed, it emits a purple-coloured fluid, probably as a meansof defence. In Physa the animal is always sinistral, having the respiratory and genitalorifices on the left side. The tentacles are cylindrical, and the eyes are at their. VARIOUS FORMS OF THE GENUS 1. Limnceaglabra; 2, L. palustris ; 3, /.. stagnates; -1, /,. Innicatula; ~>, ; 6, L. vulgaris; 7, L. ovata; 8, L. auricularia. inner base, as in Limncea. The mantle is furnish
The royal natural history . common pond-snail (Limncca other known form, although some of the South American types approximateclosely. When disturbed, it emits a purple-coloured fluid, probably as a meansof defence. In Physa the animal is always sinistral, having the respiratory and genitalorifices on the left side. The tentacles are cylindrical, and the eyes are at their. VARIOUS FORMS OF THE GENUS 1. Limnceaglabra; 2, L. palustris ; 3, /.. stagnates; -1, /,. Innicatula; ~>, ; 6, L. vulgaris; 7, L. ovata; 8, L. auricularia. inner base, as in Limncea. The mantle is furnished on each side with more ov lesselongate lobes, which, when the mollusc is crawling, are folded back upon theexterior of the shell. In their habits these snails resemble the preceding genus, andthey are almost cosmopolitan in their distribution. Physopsis, a Central and South 352 MOLLUSCS,
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectzoology
