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 1 9 |            could not be walking or swimming or flying. For since limbed
 2 9 |           leaps. So too flying and swimming things progress, the one
 3 9 |        like the Ray, produce their swimming movement with the actual
 4 16|         that they use them not for swimming but for walking; they always
 5 17| hard-skinned and its limbs are for swimming and not for walking (and
 6 17|         useful to the crayfish for swimming, but the crab is not a swimming
 7 17|    swimming, but the crab is not a swimming creature. Further, it alone
 8 17|           back are serviceable for swimming. The reason for their having
 9 17|            the water when they are swimming.~
10 18|           air. Fins are useful for swimming, but feet not. And if they