Some time ago I borrowed a little book, which was a collection of short stories. I am really talking likely of a less-than-200 pages book.
I think that on the back of the book was written that this author might have or had indeed inspired Lovecraft.
The first story (not sure if it was the longest, but in any case it was probably 10-15 pages long? Surely far from 50) was a about a ship (a merchant ship?) which is suddenly attacked by a huge, worm-like, sea creature.
I'm not sure, but I think that the main character survives the event by sheltering in a cabin or something similar.
For now, the first story is the only one I remember. Should any other one come up to memory, I'll update the present question.