Haven’t had a sea monster for a while so here is an article listing quite a group. I was interested to see that the prevailing thought in 1926 was that man had already classified most of the worlds animals. I admire their self belief but I think we all know that we are still finding new critters, large and small, every year. Either way, they were sure they had never before seen creatures like the ones listed in this article.
The Florida monster was clearly well-fed, weighing 15 tonnes and containing a 400 pound octopus, a 1500 pound Blackfish and 4 hundredweight of coral (a US hundredweight is just over 45kg or 100-ish pounds).
The Bombay monster that was 25 1/2ft long and described as ‘human-faced’ with sharp teeth in a mouth that was 3ft long. Not sure about you but none of the humans I know have a 3ft mouth. This monster was still alive after 48 hours on land.
The creature found at Port Fairy was an interesting collection of body parts. Over 9ft long with a tail like a screw shaft, nose like a rhinoceros (maybe they mean horn, nose is not very exciting, just a hole out of each side of its snout) a huge toothless mouth and soft black skin.
Yarmouths one was a little boring, seal-like with a beak and porpoise tail, double row of teeth and a blowhole.
The fish in Maine was described as having a wide head and a mouth like a bag and gristle instead of bones sounds to me like a small basking shark.