National Geographic : 1980 Apr
Crystal drifters ON SUBMARINE WINDS, a nudibranch (left), one of nature's most beautiful and bizarre creations, glides along using its paddlelike gills to help provide balance. One of a largegroup, also known as sea slugs, this creature is a marine-some might say Cinderella-cousinof the common garden slug. Anchored to the seafloor, three nudibranchs of the same species (left, bottom) trap plankton in oral hoods that resemble tiny radarscreens. Whereas most of the matter visible within the transparentbody of the nudibranchis digestive tract, the bulk of substance seen in an orangejellyfish (below) constitutes the animal's reproductive system. Jellyfish emit astronomicalnumbers of eggs and sperm into the sea, leavingfertilizationto chance. GONIONEMUSVERTENS.3 IN: CHARLESR. NICKLIN. JR.