. Text-book of zoology for schools and colleges. Zoology. Fig. 91.—The Pearly Naui^lus (Nautilus pompilius). a Mantle; 6 Its dorsal fold; cHood; 0 Eye; t Tentacles; / Funnel. Of the fossil TetrabrancMata the most important are the Orthocerata and the Ammonites. The Orthoeerata (Fig. 92) played a very important part in the seas of the Palaeozoic or Ancient-life period of the earth's history, in which they ap- parently filled the place now taken by the predacious cuttle-. FiG. 92.—Orthoc&ras iseplorafor. 1. Side view of a fragment, showing the edges of the septa. 2. Transverse section of the
. Text-book of zoology for schools and colleges. Zoology. Fig. 91.—The Pearly Naui^lus (Nautilus pompilius). a Mantle; 6 Its dorsal fold; cHood; 0 Eye; t Tentacles; / Funnel. Of the fossil TetrabrancMata the most important are the Orthocerata and the Ammonites. The Orthoeerata (Fig. 92) played a very important part in the seas of the Palaeozoic or Ancient-life period of the earth's history, in which they ap- parently filled the place now taken by the predacious cuttle-. FiG. 92.—Orthoc&ras iseplorafor. 1. Side view of a fragment, showing the edges of the septa. 2. Transverse section of the same, showing the siphuncle (s). (Billings.) fishes. They agreed vnth the Nautilm in having a many- chambered shell, divided by curved partitions, perforated by a tube or siphuncle. The shell, however, differed from that of the Nautilus in not being curved or coiled up, but in being. 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 Nicholson, Henry Alleyne, 1844-1899. New York, D. Appleton and Co.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
