South-east of the city, are the gigantic, snowclad volcanoes of Popocatepetl (Smoking Mountain) and Ixtaccihuatl (White Woman).
Both of them are extinct and Popocatepetl no longer smokes.
Another group is Pronolagus, typified by the Cape thick-tailed hare, the so-called Lepus crassicaudatus, which is externally similar to Lepus proper, but has the skull and teeth of the general type of the next group. The tailless rabbit of Mount Popocatepetl, Mexico, originally described as a distinct generic type, under the name of Romerolagus nelsoni, is broadly distinguished by the entire absence of the tail, and the short ears and hind-feet, its general form being like that of the Liu-Kiu rabbit, while, as in the latter, the post-orbital process of the skull is small, and represented only by the hinder half.
The ascent of Popocatepetl is made on the northeastern slope, where rough roads are kept open by sulphur carriers and timber cutters.
That volcanic influences are still present may be inferred from the circumstance that the snow cap on Popocatepetl disappeared just before the remarkable series of earthquakes that shook the whole of central Mexico on the 30th and 31st of July 1909.
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