It is only known that these shells, like the Paludinæ, are furnished with an operculum. [Please select]
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* * * * * This is the most common of the two shells of this genus, which have their mouths closed by a shelly operculum. [Please select]
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The male again moved into position at the lower left edge of the operculum of the female as at Station 29-G. [Please select]
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_Page 142_ _SUB-FAMILY SYRNIINÆ_ Bill bending from the base; tufts more or less conspicuous or wanting; facial disc complete; ears large, covered by an operculum; legs feathered to the claws. [Please select]
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_ Shell globose, very smooth, olive; spire depressed; margin of the aperture thick, fulvous, grooved; umbilicus small, contracted, placed near the base; operculum shelly. [Please select]
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