Hanging Stomach Jellyfish Scientific name: Stomotoca atra Size: 25mm wide bell Distribution: The Bering Sea to Southern California. Commonly seen in the summer in Puget Sound, British Columbia, and Alaska. Author: Julia Traill This hydromedusa is characterized by a long manubrium that hangs below the bell with regularly folded gonads attached to it that are a light gray to tan in colour. It has 2 large tentacles on each side as well as 80 small marginal tentacles encircling the bell. References: Wrobel, D., & Mills, C. (2003). Pacific Coast pelagic invertebrates: A guide to the common gelatinous animals. Monterey, CA.