Page:Walcott Cambrian Geology and Paleontology II.djvu/68

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36
SMITHSONIAN MISCELLANEOUS COLLECTIONS
VOL. 57
DESCRIPTION OF PLATE 5
PAGE
Sidneyia inexpectans Walcott 24
Fig. 1. The third, fourth, and fifth appendages of the cephalo-thorax, showing the gnathobases and something of the proportions of the appendages. ✕ 3. U. S. National Museum, Catalogue No. 57494.
2. A small, nearly entire dorsal shield flattened and broken by compression in the shale. The position of the visceral cavity beneath the abdomen is faintly indicated through the thin test. Natural size. U. S. National Museum, Catalogue No. 57495.
3. A large epistoma attached to the frontal rim of the cephalo-thorax and crowded back over the two anterior segments of the abdomen. Natural size. U. S. National Museum, Catalogue No. 57496.
Amiella ornata Walcott 27
Fig. 4. Portion of a broken dorsal shield, showing parts of several abdominal segments which have been pushed one over the other. ✕ 2. U. S. National Museum, Catalogue No. 57499.