Didinium is a voracious hunter of live food, namely Paramecium. It is found quite commonly in freshwater habitats such as ponds and other still waters. It is in constant motion, swimming around in search of prey.
1938 S Jefferson Nickel. CoinTrackers.com has estimated the 1938 S Jefferson Nickel value at an average of $3, one in certified mint state (MS+) could be worth $50.(see details)...umismatic Value: $3 to $50.00. Value: As a rough estimate of this coins value you can assume this coin in average condition will be valued at somewhere around $3, while one in certified mint state (MS+) condition could bring as much as $50 at auction.
Between 1942 and 1945, the mint stopped using nickel in the Jefferson coins and replaced it with silver. The coins produced were as bright and shiny as silver dimes, quarters and halves! Because these Silver War Nickels were worth more than face value, the Mint put a huge mintmark on each, right above Monticello on the reverse, so they could pull them out of circulation after the war.