Millipedes in the collection of the AMCS. 3. Reddellobus troglobius n. gen., n. sp., an unusual troglobite from Puebla, Mexico, and other records of the family Spirobolellidae (order spirobolida, Class Diplopoda). International J Speleol, 6 1975: 333-338. 334 [Zoological Record Volume 112]