The specimen chosen as a type of these rosette-like disks was obtained from a mound near Nashville, Tenn., by Professor Powell. It was found near the head of a skeleton, which was much decayed, and had been so disturbed by recent movements of the soil as to render it difficult to determine its original position. The shell used is apparently a large specimen of the _Busycon perversum_, although the lines of growth are not sufficiently well preserved to permit a positive determination of the species. The substance of the shell is well preserved; the surface was once highly polished, but is now pitted and discolored by age. The design is engraved on the concave surface as usual, and the lines are accurately drawn and clearly cut. The various concentric circles are drawn with geometric accuracy around a minute shallow pit as a center. These circles divide the surface into five parts--a small circle at the center surrounded by four zones of unequal width. The central circle is three-eighths of an inch in diameter, and is surrounded by a zone one-half an inch in width, which contains a rosette of three involuted lines; these begin on the circumference of the inner circle in three small equidistant perforations, and sweep outward to the second circle, making upwards of half a revolution. These lines are somewhat wider and more deeply engraved than the other lines of the design. In many specimens they are so deeply cut in the middle part of the curve as to penetrate the disk, producing crescent-shaped perforations. The second zone is one-fourth of an inch in width, and in this, as in all other specimens, is quite plain. The third zone is one-half an inch in width, and exhibits some very interesting features. Placed at almost equal intervals we find six circular figures, each of which incloses a circlet and a small central pit; the spaces between the circular figures are thickly dotted with minute conical pits, somewhat irregularly placed; the number of dots in each space varies from thirty-six to forty, which gives a total of about two hundred and thirty.