• Caption: Common Name: sea butterfly, Scientific Name: Limacina helicina, Size: 1.9 mm, Notes: pteropod, shell is max 1.25mm across, Location: Beneath the Golden Gate Bridge, San Francisco, California, Contact: David Liittschwager, Natural History Photography, 120 Parnassus Avenue #1, San Francisco, CA 94117, cell: 415 531 6882, email: liittschwager@mac.com