. The biology of the frog . 242 THE BIOLOGY OF THE FROG IZ- distal end of the radio-ulna is widened, and ends in twoepiphyses, one for each of the component bones. The carpus, or wrist of the frog, contains six bones arrangedin two rows. In the proximal row the ulnare and radiateare situated at the ends of the ulna and radius, respectively,and at the inner or preaxial side of the radiale is the the distal row the first carpaloccurs just behind the rudimentarythumb; the second carpal, a verysmall bone, lies behind the seconddigit; the outer carpal is of rela-tively large size, and i
. The biology of the frog . 242 THE BIOLOGY OF THE FROG IZ- distal end of the radio-ulna is widened, and ends in twoepiphyses, one for each of the component bones. The carpus, or wrist of the frog, contains six bones arrangedin two rows. In the proximal row the ulnare and radiateare situated at the ends of the ulna and radius, respectively,and at the inner or preaxial side of the radiale is the the distal row the first carpaloccurs just behind the rudimentarythumb; the second carpal, a verysmall bone, lies behind the seconddigit; the outer carpal is of rela-tively large size, and is formed by thefusion of three originally distinctbones one for each of the threeouter digits of the hand. Beyondthe wrist are the five metacarpals,which form the skeleton of the proxi-mal part of the hand. The first meta-carpal is rudimentary and usually car-tilaginous in the female, but in themale it is larger, and becomes calci-fied or even ossified. The othermetacarpals are elongated cylindricalbones, somewhat expanded
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