PLATE 27. 
Dorsal view of skulls of Neotoma desertorum from the Mohave Desert 
(series at left) and Neotoma nevadensis (series at right). Enlarged to 114 
natural size. Note in nevadensis the smaller size, the broader and shorter 
premaxillaries, the less widely spreading zygomatie arches, and the nar- 
rower dorsal anterior roots of the same. 
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