  The specific heat of single crystal hole-doped Ca0.33Na0.67Fe2As2,
Tc(onset)=33.7 K, was measured from 0.4 to 40 K. The discontinuity in the
specific heat at Tc, deltaC, divided by Tc is 105 +- 5 mJ/molK2, consistent
with values found previously for hole-doped Ba0.6K0.4Fe2As2 and somewhat above
the general trend for deltaC/Tc vs Tc for the iron based superconductors
established by Bud'ko, Ni and Canfield. The usefulness of measured valued of
deltaC/Tc as an important metric for the quality of samples is discussed.
