isostrophic
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planispiral — adj. [L. planus, flat; spira, coil] (MOLLUSCA: Gastropoda) Shells coiled in a single plane like a flat spiral with symmetrical sides; loosely used for shells whorled in a discoid form with asymmetrical sides; see isostrophic … Dictionary of invertebrate zoology
umbilicus — n.; pl. lici [L. umbilicus, navel] 1. A navel, or navel like depression. 2. (MOLLUSCA: Gastropoda) A cavity formed around the shell axis between the faces of the adaxial wall of the whorls where these do not coalesce to form a solid columella. a … Dictionary of invertebrate zoology
