52 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
in a bronze alloy, measures 75 mm. in diameter, and shows 
on the obverse the head of Minerva encircled by Mermaids, 
a dolphin and Neptune holding in his left hand the trident, 
and in his right the Naturalists’ dredge, with the legend 
““ Voyage of H.MLS. ‘ Challenger,’ 1872-76” ; and on the reverse 
an armoured knight casting down his gauntlet in challenge to 
the waters—being the crest of H.M.S. “ Challenger °—with 
Portrait of Dr. John Murray, from the “Challenger” Album. 
the legend, “ Report on the scientific results of the ‘ Challenger ’ 
Expedition, 1886-95.” The name of the recipient of the medal 
is engraved on the lower margin. 
