. The earth in past ages. Geology, Stratigraphic; Earth sciences. SILURIAN ROCKS. 91 compound, and the individual can be - with a lens, and although g gether and raised in genus Pha metimes to be s ich of th the cephn the under side oi the developed. :nue, there were ., but only one of them '•d. The jointed limbs on the trunk c - : the other 1 gill; so that tin- ar to tx to the h Crustacea tern. s, notwithstanding their irkable external resem- blance to the k;: g . they approxi- mate. The 1:: adually di- minish in size from front to back, where the bin ind rudiment The two longitudinal grooves
. The earth in past ages. Geology, Stratigraphic; Earth sciences. SILURIAN ROCKS. 91 compound, and the individual can be - with a lens, and although g gether and raised in genus Pha metimes to be s ich of th the cephn the under side oi the developed. :nue, there were ., but only one of them '•d. The jointed limbs on the trunk c - : the other 1 gill; so that tin- ar to tx to the h Crustacea tern. s, notwithstanding their irkable external resem- blance to the k;: g . they approxi- mate. The 1:: adually di- minish in size from front to back, where the bin ind rudiment The two longitudinal grooves make the three lobes of a Trilol The m a ent Trilo- bites include the simplest and some of the m complex. They vary chiefly in the number of :he form and size of the cephalo-tho- rax, and the pygidium; in the elongation of the pleurae of the abdomen ; in the external ornament of the carapace, which sometimes takes the form. Triarthrus, Fig. 11.—A Trilobite show- ing feet and 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 Seeley, H. G. New York, Review of Reviews Co.
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