Couple of quick comments:

""Sailboat Malarkey" must be the Bahamian song Hugill was talking about."
Included on an album of field recordings from the Bahamas (I think it is also on one of the Lomax series)
I have the Bahaman album somewhere - not got round to digitising it yet.
I think Roy Harris also recorded it - though he may have sung it at the Singers Club.

"Blow Boys Blow
Lead by MacColl.
Melody perhaps after Terry. The lyrics here are interesting: "Where fever makes the White man shiver.""

One of the few shanties I partially remember from my grandfather's singing

Was you ever on the Congo river,
Where fever makes the white man shiver.

A Yankee ship sailed up the river
Her masts and spars they shone like silver.

What do you think we had for dinner?
Blind scouse pie and donkey's liver.

What do you think we had for supper?
?????

Who do you think was the first mate of her?
Tommy Brown the n***** lover.

Who do you think was the captain of her
??????

Blow me boys and blow forever,
Blow her down the Congo River

Jim Carroll