. Zoology. Zoology. Fig. 1S4.—Younfc Horseshoe Crab. Natural size and enlarged. Fia 135.—Young Trilobite. Natural size and enlarged. horseshoe craL in being divided into a true head consisting of six segments bearing jointed appendages, somewhat like those of the Merostomata, with from two to twenty-six dis- tinct thoracic segments (probably bearing short jointed. Fig. 126.—Restored section o£ the thorax of a trilobite (Ualymene) after Wal- cott. c, carapace; e)i, endopodite; fv*', exopodite, with the gills on the exo- podal or respiratory part of the appendage. limbs not extending beyond the
. Zoology. Zoology. Fig. 1S4.—Younfc Horseshoe Crab. Natural size and enlarged. Fia 135.—Young Trilobite. Natural size and enlarged. horseshoe craL in being divided into a true head consisting of six segments bearing jointed appendages, somewhat like those of the Merostomata, with from two to twenty-six dis- tinct thoracic segments (probably bearing short jointed. Fig. 126.—Restored section o£ the thorax of a trilobite (Ualymene) after Wal- cott. c, carapace; e)i, endopodite; fv*', exopodite, with the gills on the exo- podal or respiratory part of the appendage. limbs not extending beyond the edge of the body). The abdomen consists of several (greatest number twenty-eight) coalesced segments, forming a solid portion {pygidium), sometimes ending in a spina The larval trilobite (Fig. 125). 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 Packard, A. S. (Alpheus Spring), 1839-1905. N. Y. , Holt
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1897
