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The trunk of the electric rays has the form of a flattened, roundish or oval disc, fleshier toward the margins than it is in other Gulf of Maine skates or rays, and the body is softer. The tail, too is broader and shorter; there are one or two relatively larger dorsal fins on the tail, and the latter ends in a well-developed claudal fin also.
The most interesting feature of the electric rays is that they have two large electric organs, each of which occupies one side of the front part of the disc. In the only Gulf of Maine species the two organs together make up about one-sixth of the total weight of the fish.