The Aegean itself is naturally divided by the island-chains and the ridges from which they rise into a series of basins or troughs, the deepest of which is that in the north, extending from the coast of Thessaly to the Gulf of Saros, and demarcated southward by the Northern Sporades, Lemnos, Imbros and the peninsula of Gallipoli. [Please select]
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Rostrum, if present, not sharply demarcated from forehead Go to 19 b. [Please select]
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Body black with sharply demarcated white belly and oval white patch above and behind eye; gray saddle behind dorsal fin. [Please select]
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These patches of lighter coloration, clearly demarcated from each other and from the surrounding coloration, are frequently visible simultaneously with the dorsal fin as the animals roll at the surface to breathe. [Please select]
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