In Plate LXIII I present two of the best examples of these serpent gorgets yet brought to light. They were obtained from the McMahan Mound, at Sevierville, Tenn., in 1871, and are in an excellent state of preservation. Both are made from large heavy specimens of the _Busycon perversum_. The example given in Fig. 1 is but slightly altered by decomposition, the translucency of the shell being still perceptible. The back retains the strongly marked ridges of growth. The interior has been highly polished, but is now somewhat marked, apparently by some fine textile fabric which has been buried with it and has, in decaying, left its impress upon the smooth surface of the shell. The design is very much like the type described, but has some peculiar features about the neck and under the head of the serpent. The specimen shown in Fig. 2 may be regarded as a type of these gorgets, and is the one chiefly used in the general description given on a preceding page. It is six inches long by five wide, and has been neatly dressed and polished on both sides. As every detail is clearly and correctly shown in the cut I shall not describe it farther. [Illustration: PL. LXIII--RATTLESNAKE GORGETS. 1. McMahan Mound, Tenn. 2. McMahan Mound, Tenn. (3/4)] For convenience of comparison I have arranged two plates of outlines. The specimen shown in Fig. 1, Plate LXIV, is almost identical with the one last mentioned in size and shape. This, with the similar but somewhat smaller specimen given in Fig. 2, is also from the McMahan Mound. Figs. 3 and 4 are outlines of the specimens already given in Plate LXIII. The fine specimen shown in Fig. 5 is from the Brakebill Mound, near Knoxville, Tenn., and is now in the Peabody Museum. It is five inches in length and a little more than four and one-half in width. It is very much like the Sevierville specimens and is made of the same species of shell. The markings of the space beneath the head are peculiar, and in some other details it differs from the other specimens. Fig. 6 illustrates a large specimen now in the National Collection. It is also from Tennessee, and resembles the preceding examples quite closely. [Illustration: PL. LXIV--RATTLESNAKE GORGETS. 1. McMahan Mound. 2. McMahan Mound. 3. McMahan Mound. 4. McMahan Mound. 5. Brakebill Mound. 6. Williams Island. Tennessee.] The specimens illustrated in Plate LXV represent a somewhat different type of design, but are found associated with the others. The three shown in Figs. 2, 6, and 7 belong to the Peabody Museum, and are from mounds in East Tennessee. The others are in the National Collection, and come from the same region. [Illustration: PL. LXV--RATTLESNAKE GORGETS. 1. McMahan Mound. 2. Lick Creek Mound. 3. McMahan Mound. 4. McMahan Mound. 5. Green County Mound. 6. Lick Creek Mound. Tennessee.]