  This note continues our previous work on special secant defective
(specifically, conic connected and local quadratic entry locus) and dual
defective manifolds. These are now well understood, except for the prime Fano
ones. Here we add a few remarks on this case, completing the results in our
papers \cite{LQEL I}, \cite{LQEL II}, \cite{CC}, \cite{HC} and \cite{DD}; see
also the recent book \cite{Russo}
