Century Dictionary and Cyclopedia
- Having the spire depressed so that the whorls lie in the same plane, like those of the genus Planorbis; planorboid.
“This genus from its distinctly sinistral character is evidently allied to lAmacinay from which its planorbiform mode of growth distinctly separates it.p. i m i t a n 8.”
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This quickly got bigger and weirder than originally intended, so now it's housing terms that relate to the study of dinosaurs and other prehistoric creatures. See also Dinosaurs, Pterosaurs, Ichthy...
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