O1P3I1S1T1H4O1B3R1A1N1C3H4S1
26 points
OPISTHOBRANCHS is validvalid
OPISTHOBRANCH, [n]
OPISTHOBRANCH, a type of mollusc having gills, little or no shell, two pairs of tentacles [n]
OPISTHOBRANCH, [n]
OPISTHOBRANCH, a type of mollusc having gills, little or no shell, two pairs of tentacles [n]