A classification of the American operculate land moilusks of the family Annulariidae

  title={A classification of the American operculate land moilusks of the family Annulariidae},
  author={J. B. Henderson and P. Bartsch}
known species comprising thatlargeand diversified assemblage of operculate land-snails. Opercular characters have been employed for aU the larger groupings, that is, the subfamilies and genera. The comparatively few species, the opercula of which we have not actually seen, are excluded from consideration. Wesoon found that assumptions as to generic position of a species based upon similarity of shell characters were too often misleading. To the total of the species involved the proportion of… Expand
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