Figure 43. Left hind feet of {a) platypus {Ornithorhynchus) ; (b) the in- 

 sectivore Galemys ; (c) the marsupial Chironectes ; the otters {d) Aonyx. 

 {e) Microaonyx, and (/) Lutra maculicoUis; {g) sea otter (En hydra) \ 

 (h) beaver (Castor); and (/) muskrat (Ondalra): (d, e, and / redrawn 

 from Allen). 



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