Translated from French language:[2] "Shell suborbicular, convex on both sides, a little depressed, obtusely carinated, imperforate, glabrous; whitish with a circular reddish line above; aperture five toothed; lip strongly reflexed."

Its external opening is immediately behind that of the alimentary canal, and from this point is readily followed to the region of the pericardium, where it decreases in caliber and passes into a network of blood vessels.

[3] The description of the reproductive system of Ringicella ringens as described by Fischer (1869) applies in all essential details to Anostoma depressum with the exception of a penis retractor muscle attached to the vas deferens.

In Anostoma depressum the external reproductive pore, located on the right side of the head, leads into a small atrium with which the penis, hermaphroditic duct, and seminal receptacle attach.

The first named is a heavy, muscular organ, accompanied by the usual slender vas deferens, their union being effected at some distance from the distal end of the penis, which thus forms a flagellum.

The penis and flagellum are both sharply defined and appear to be without muscular attachments, though bound to the body wall by delicate connective tissue strands.

While the duct leading to it from the accessory glands is clearly apparent throughout the first part of its course, it gradually approaches the vanishing point, and cannot with certainty be traced to a gonad, which is accordingly drawn in its hypothetical position.