Fig. 56. Ratio diagrams illustrating some proportional relationships in cranial and dental dimensions between Bunomys fratrorum (the standard, N 5 100) and B. andrewsi (N 5 98), and between B. fratorum and B. penitus (N 5 185). Data were derived from values for mean, standard deviation, and sample size of variables listed in table 42. How the diagram was constructed and how to read it is explained in Materials and Methods.