Harold von Braunhut, who used comic book advertisements to sell whimsical mail-order inventions like Amazing Sea Monkeys, tiny shrimp that pop to life when water is added, died on Nov. 28 at his home in Indian Head, Md. He was 77.

His wife, Yolanda, said that he died after a fall but that the exact cause was not known.

Mr. von Braunhut was to quirky inventions what Barnum was to circuses. His X-Ray Specs, which advertisements said allowed wearers to see through flesh and clothing, are still selling after 50 years of guffaws. Hermit crabs as a pet? Thank Mr. von Braunhut for Crazy Crabs.

And yes, perhaps only this verbally snappy holder of 195 patents could have realized that what the world needed was Amazing Hair-Raising Monsters, which allow a child to add water to a card and watch hair grow on the previously bald pate of the monster depicted there.

But Mr. von Braunhut's pièce de résistance was Sea Monkeys -- which come from dried-up lake bottoms, not the sea, and are not monkeys but brine shrimp. His extravagant claims for the crustaceans -- for example, that they come back from the dead and that they can be trained and hypnotized -- are convincing because they are sort of true. (The shrimp do follow light.)