The shells of Arca subrenata Lischke., Arca granosa linnaeus, as well as Arca inflata relve from the family ass shell animal. Arca subcrenata Lischke: triangular, fan-shaped, 3-4cm, 4-5cm high. The shell is arched to the outside, and brown-pigmented hairs, which are mostly down already. The pointed end of the shell is rolled up. The left bowl is a little larger than the right cup. Each shell has approx. ribs 30-34 from the apex to the shell margin over the course of the end of radial. The height of the apex narrow the beginning of the end of the ribs towards the spread to the shell edge. The width of the ribs folding and ripping a furrow is constant. The smooth shell is white and smooth.
The drug has a hard consistency.
Organoleptically, it shows a weak smell and taste.