Its head was nearly destroyed, and only the stumps of two arms were visible ... The body, as it lies somewhat imbedded in the sand, is 18 feet long and about 7 feet wide, while it rises  feet above the sand ...
This passage describes a massive, damaged creature buried in sand. Its head is severely damaged, leaving only two arms visible. The body is large, measuring 18 feet long and 7 feet wide, rising above the sand by a significant amount.