. The Echo. Mollusks. most, Aspella species apparently live on a coarse rubble type of bottom, with its obviously different biological requirements. The generally dorsoventrally flattened shells of these forms are small, with broad varices, a siphonal canal that is closed, with long, tube-like anal canals that are persistent for several varices (Typhis, Figure 9) or a narrowly open canal with several buttress-like projections of each whorl touching the earlier whorl (Aspella, Figure 10). The shell is variously colored and sculptured but a thick, white, intricately sculp- tured intritacalx cove
. The Echo. Mollusks. most, Aspella species apparently live on a coarse rubble type of bottom, with its obviously different biological requirements. The generally dorsoventrally flattened shells of these forms are small, with broad varices, a siphonal canal that is closed, with long, tube-like anal canals that are persistent for several varices (Typhis, Figure 9) or a narrowly open canal with several buttress-like projections of each whorl touching the earlier whorl (Aspella, Figure 10). The shell is variously colored and sculptured but a thick, white, intricately sculp- tured intritacalx covers the hard shell surface in most 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 Western Society of Malacologists; Western Society of Malacologists. Abstracts and proceedings of the annual meeting. [San Diego, Calif. ] Western Society of Malacologists
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