  Recent interest in honeycomb lattice materials has focused on their potential
to host quantum spin liquid (QSL) states. Variations in bond angles and spin
allow a range of interesting behaviors on this lattice, from the predicted QSL
ground state of the Kitaev model to exotic magnetic orders. Here we report the
physical properties of two compounds with rare earths on an approximate
honeycomb lattice. The isostructural compounds Nd$_2$S$_5$Sn (J =
$\frac{9}{2}$) and Pr$_2$S$_5$Sn (J = 4) permit a direct comparison of
half-integer versus integer spins on this lattice. We find strikingly different
magnetic properties for the two compounds. Nd$_2$S$_5$Sn orders
antiferromagnetically at T$_N$ $\approx$ 2.5 K, and undergoes several magnetic
transitions to other ordered states under applied field. Pr$_2$S$_5$Sn displays
no magnetic ordering transition above T = 0.41 K, and may be proximate to a
spin liquid state.
