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Illustrating the elaborate arrangement of teeth in the aperture of some land Pulmonata. A. Helix (Labyrinthus) bifurcata Desh., Equador. B. H (Pleurodonta) picturata Ad., Jamaica: C. H (Dentellaria) nu denticulata Chem., Demarara; D. Anostoma carinatum Pfr. Brazil; a, tube communicating with interior of shell; E. H. (Stenotrema) stenotrema Fer., Tennessee; F. H. (Polygyra) auriculata Say, Florida; G. H. (Plectopytis) refuga Gld., Tenasserim

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