Talk:Monster Girl Encyclopedia I/@comment-26102470-20150212133858/@comment-25035274-20150212191210

Found it.Q&A Session 4, Question 3

Can mermaids move on land? "Possible. There are various ways like using the spells of human-transformation, crawling by their tail like Lamia, hovering in the air with their mana(still they cant fly so freely)."

So there you have it. Mermaids(and thus, logically their subspecies and even the less obviously related octopoidal species like the Scylla and Kraken) can travel on land if they really want to.