They appear penile in appearance, but bear a number of protrusions and spikes. They are about the size of a small cat, but are very vicious. Among their attacks is the expulsion of a thick sticky liquid that slows escape.
In 1936,Gerard Filippani encountered four of these in a pocket of the Never-Never, summoned by Mortimer Stroud. gerard managed to fight them off long enough to escape the pocket taking the Mesha Stele with him.