\[\xymatrix @R+.6pc @C+1.5pc {
\def\adj{\ar@{}[rd]|<<<<<<<<<<{\rotatebox[origin=c]{-45}{$\dashv$}}}
\C \adj \ar[r]^{F}
\ar@{}[d]^(.15){}="c"^(.85){}="d" \ar@{^{(}->}_{\yoneda_{\C}}"c";"d"
& \catD \ar@/^1pc/[dl]^-{ \Nerve{F}} \\
\Psh\C \ar@/^1pc/[ru]|-{\scriptscriptstyle \quad \Lan{\yoneda_{\C}}{F}}&
}\]