. Animals before man in North America; their lives and times. Paleontology. Animals Before Man. A brachiopod, showing the curious spiral loop. pion has been found, showing very clearly the existence of life on land. The mollusk-like brachiopods not only multiplied in numbers dur- ing the Ordo- vician, but in- creased in com- plexity by developing curious loops and spiral structures inside their shells as well as a better form of hinge-joint. Trilobites have increased in numbers, kinds, and size, reaching at this time the highest point in their history. Perhaps the most notable ad- vance is tha
. Animals before man in North America; their lives and times. Paleontology. Animals Before Man. A brachiopod, showing the curious spiral loop. pion has been found, showing very clearly the existence of life on land. The mollusk-like brachiopods not only multiplied in numbers dur- ing the Ordo- vician, but in- creased in com- plexity by developing curious loops and spiral structures inside their shells as well as a better form of hinge-joint. Trilobites have increased in numbers, kinds, and size, reaching at this time the highest point in their history. Perhaps the most notable ad- vance is that made by true mollusks of the class Cephalopoda * in the development of forms related to the pearly nautilus, a shell that unfortunately does not sail the unruffled main, but creeps humbly along the bottom of the sea. The nautilus is a relative of the naked squids and cuttlefishes, but, unlike them, dwells in a closely coiled shell of many divi- * Head-footed, a name given on account of the tentacles ar- ranged about the head, although, oddly enough, these are univer- sally called arms, 72. 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 Lucas, Frederic A. (Frederic Augustus), 1852-1929. New York, D. Appleton and company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectpaleont, bookyear1902
