One Bursa Rana shell measuring 2 to 3 inches *****

One single Bursa Rana shell, measuring 2 to 3 inches

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Bursa is a genus of large sea snails, marine gastropod mollusks in the family Bursidae, the frog snails or frog shells.

Bursas have an ovate or oblong compressed shell, and shows two rows of continuous varices, one on each side. The aperture is oval. The columella is arcuated, and ridged or crenulated. The siphonal canal is short and recurved. The outer lip is crenated.

Crenated having the margin or surface cut into rounded scallops

The species of Bursa are mostly tropical, the majority being from the Eastern seas. They are found, when variegated and with nodose armature, in rocky places and on coral reefs. The winged species, with a smoother surface, are from deep water. They move about with considerable animation, and crawl rapidly.

variegated exhibiting different colors, especially as irregular patches or streaks

nodose a body with one or more knotted parts

armature a protective covering

These shells are distinguished by a gutterlide canal or a slit-sided tube, that cuts through the edge of the aperture at its rear end. Some frog shells are moderate in size while a few are large. They assume many shapes, some coarsely ornamented with thick ribs, knobs and warty lumps; which gives them the name frog shells. Most frog shells live on sand and coral rubble; commonly found across the Indo-Pacific region.

Aperture is a small and often narrow opening