The Lion's Mane Jellyfish

In summer on Pacific NW saltwater waterways, you'll begin to see jellyfish appearing in large numbers.  The two most common jellyfish are Moon Jellies, and the largest of the two is the Lion's Mane, (cyanea capillata). 

More Info from National Geographic online..
"The world’s largest creatures reside in the ocean, and its depths are home to unusual species whose surprising proportions are unknown on land.

Here, an underwater view captures the billowing tentacles of a lion’s mane jellyfish. The most potent species of jellyfish, the lion’s mane can reach a diameter of 6.6 feet (2 meters) with tentacles topping 49 feet (15 meters)."

Here's one shot just below the surface in Dewatto Bay on Hood Canal in July.  Camera: Oregon Scientific ATC9K.