  Normal behavior of the thermodynamic properties of a Fermi gas in $d>2$
dimensions, integer or not, means monotonically increasing or decreasing of its
specific heat, chemical potential or isothermal sound velocity, all as
functions of temperature. However, for $0<d<2$ dimensions these properties
develop a ``hump'' (or ``trough'') which increases (or deepens) as $d\to 0$.
Though not the phase transition signaled by the sharp features (``cusp'' or
``jump'') in those properties for the ideal Bose gas in $d>2$ (known as the
Bose-Einstein condensation), it is nevertheless an intriguing structural
anomaly which we exhibit in detail.
