Eden Phillpotts - The Terror From The Sea: (The Owl Of The Athene, 1936)
The fighting lines had long been observed to consist of two species: the monstrous Brychura and the spider-crabs, their allies. The spiders were not larger, but far speedier, and they took the place of cavalry to the foot regiments of old. Spider crab stood some twenty feet off the ground on lengthy legs as hard as steel and was the size of an average elephant. He could proceed over any sort of ground at forty miles an hour and he was responsible for terrible raids upon Man ..."
Fantastic giant killer crustaceans-on-the-rampage mini-epic, reputedly caused a small-scale panic when an adapted radio version was broadcast by the BBC in 1938. Relevant chapter reproduced in Peter Haining's Tune In For Fear, (Kimber, 1985)
From the first, I set myself against "literature"; the story was the thing, and no amount of style could persuade me to select a story that lacked genuine, unadulterated horror. For those who wanted something high-brow there was plenty.