. Bulletin of the Essex Institute. Essex Institute; Natural history; genealogy. Figs. 1 and 2. be compared to the frame of a pair of eye-glasses, only in place of the delicate spring connecting the rings, the intervening space is solid metal though less in width than the transverse diameter of the ring (see plan, Fig. 2). This space may be called the body, and from this body spring three spines at right angles to the plane of the rings. It will be observed that the rings are not on a plane but turn slight- ly upward so that the object rests on the body. This feature is very marked in some spec
. Bulletin of the Essex Institute. Essex Institute; Natural history; genealogy. Figs. 1 and 2. be compared to the frame of a pair of eye-glasses, only in place of the delicate spring connecting the rings, the intervening space is solid metal though less in width than the transverse diameter of the ring (see plan, Fig. 2). This space may be called the body, and from this body spring three spines at right angles to the plane of the rings. It will be observed that the rings are not on a plane but turn slight- ly upward so that the object rests on the body. This feature is very marked in some specimens though in rare instances the rings are in a plane, and in very rare cases bend slightly. Fig. 3. End Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Essex Institute. 1n. Salem, Mass. , Essex Institute
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