Cranium and mandible of Calomys venustus 29 12. Cranium and mandible of Phyllotis cf xanthopygus 29 13. Cranium and mandible of Phyllotis wolffsohni 30 1 4. Cranium and mandible of Mesomys hispidus 31 15. Cranium and mandible of Lonchothrix emiliae 32 16. Dorsal views of skins of Isothrix bistriata and /. pagunis 32 17. Cranium and mandible of Isothrix pagums 33 18. Contrasts in dorsal pelage of two morphs identified as Echimys armatus 34 m Mammals in the Royal Natural History Museum, Stockholm, Collected in Brazil and Bolivia by A. M. Olalla during [1934][1935][1936][1937][1938]
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