In Fig. 1, Plate LV, we have a well-preserved disk which has four involute lines, the others having three only; these lines are deeply cut and, for about one-third of their length, penetrate the shell, producing four crescent-shaped perforations. The circles in the third or dotted zone are neatly made and evenly spaced, and inclose circlets and conical pits. The dots in the intervening spaces are closely and irregularly placed, and in number range from forty to forty-five, giving a total of about three hundred and forty. Other features are as usual. The specimen was obtained from a stone grave in Kane's Field, near Nashville, Tenn., and is now in the Peabody Museum. It is possible that the specimen presented in Fig. 2, Plate LV, should not be placed in this group; but as there are many points of resemblance to the type, it may be described here. At first sight it appears that one of the outer zones is lacking, but it will be seen that through some unknown cause the two have been merged together, alternating bosses of the outer line being carried across both zones. The whole design has been carelessly laid out and rudely engraved. The lines of the involute are arranged in four groups of two each and occupy an unusually wide belt. There are near the margin two sets of perforations for suspension. The specimen was obtained from the Brakebill mound, near Knoxville, Tenn., and is in an advanced stage of decay. [Illustration: PL. LV--SHELL DISKS. 1. From a mound near Nashville. (1/1) 2. From the Brakebill Mound. (1/1) Tennessee.] In Plate LVI, Fig. 4, I present a small specimen, which has the appearance of being unfinished. The zones are all defined, but, with the exception of the outer, which has thirteen bosses, are quite plain. The lines are deeply but rudely cut. It was obtained from a stone grave at Oldtown, Tenn., and is now in the Peabody Museum. Besides the type specimen already presented, there may be seen in the National Museum two very good examples, from a mound near Franklin, Tenn. The smaller is about three inches in diameter and is nearly circular; it has suffered much from decay, but nearly all the design can be made out. The lines of the involute penetrate the disk producing short crescent-shaped perforations; the circles in the dotted zone are seven in number and inclose the usual circlets and conical pits; the dots in the intervening spaces are too obscure to be counted. The specimen has sixteen marginal scallops. The larger specimen is somewhat fragmentary, portions being broken away from opposite sides. It is nearly four and a half inches in diameter, and the design has been drawn and engraved with more than ordinary precision. The central circle incloses a perforated circlet, and the involute lines are long and shallow. The dotted zone has seven circles with inclosed circlets and pits. The outer zone contains fifteen oval figures.