. A manual of zoology. 2S6 MANUAL OF ZOOLOGY sect. on the axis. When the obliquity is very slight (Fig. 174), the spiral is nearly flat; when the obliquity is great, an elongated tapering shell, such as that represented in Fig. 175, is the result. Sometimes the later whorls completely. Fig. 172. —Shell of Triton nodiferus. Natural size. New Zealand. cover over the earlier ones, so that the spiral form of the shell is concealed. Sometimes only the apical portion of the shell is spiral, the remainder being a straight or sinuous cylinder. The mouth of the shell has usually a prominent margin or.

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. A manual of zoology. 2S6 MANUAL OF ZOOLOGY sect. on the axis. When the obliquity is very slight (Fig. 174), the spiral is nearly flat; when the obliquity is great, an elongated tapering shell, such as that represented in Fig. 175, is the result. Sometimes the later whorls completely. Fig. 172. —Shell of Triton nodiferus. Natural size. New Zealand. cover over the earlier ones, so that the spiral form of the shell is concealed. Sometimes only the apical portion of the shell is spiral, the remainder being a straight or sinuous cylinder. The mouth of the shell has usually a prominent margin or. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.

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