. A manual of zoology. Zoology. Fig. s^5.—Spirilla, with internal shell val'lcr C)\ven). Externally the shell of the former, coiled in a plane, resembles that of certain snails like Plaiiorhis; but on section it is seen to be divided by partitions into numerous chambers wliicli increase in size towards the aperture. The animal occupies only the last chamber with its back. Fig. 354.—Diapiranr of shells, etc. of various cephalo|Kiils (after .1, Scfiia; B, hfloscpia; C, Pi-lrmiti/rs-: /), 0.';ti;it-(>lrii/liis; A', OiiiDin'ilrrphes. 0, anterior; p, posterior; />//, phragmocoiic; pr
. A manual of zoology. Zoology. Fig. s^5.—Spirilla, with internal shell val'lcr C)\ven). Externally the shell of the former, coiled in a plane, resembles that of certain snails like Plaiiorhis; but on section it is seen to be divided by partitions into numerous chambers wliicli increase in size towards the aperture. The animal occupies only the last chamber with its back. Fig. 354.—Diapiranr of shells, etc. of various cephalo|Kiils (after .1, Scfiia; B, hfloscpia; C, Pi-lrmiti/rs-: /), 0.';ti;it-(>lrii/liis; A', OiiiDin'ilrrphes. 0, anterior; p, posterior; />//, phragmocoiic; pr, proostraeuni; r, rostrum; .v, siphon. towards the centre of the shell {cxof;aslric positioit); the other cham- bers are tilled with air. luicli partition lias a small opening, and through these runs a stand of tissue, the siphuudc. yVmong the fossil cephalopods many forms—lire Nautiloids and Ammonites—ha\-o similar. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
