Publisher's Synopsis
Excerpt from Appendix to the Manual of Mollusca: Of S. P. Woodward, A. L. S., Containing Such Recent and Fossil Shells as Are Not Mentioned in the Second Edition of That Work
Shell fiask-shaped, smooth, transversely or longitudinally striated, or ornamented with annular folds, or plicated. The terminal cham ber (r) occupying the space above the air chambers (s), and extending down one side of nearly the whole length of the shell in the form of a wide and deep cavity, which is embraced by the decurrent edges of the in complete septa (four or five in number). This cavity also communicates at its base with a small siphuncle which traverses the minute apical air-chambers. Aperture of shell simple.
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