And as for other fish common to the Atlantic and Mediterranean, I was unable to observe miralets, triggerfish, puffers, seahorses, jewelfish, trumpetfish, blennies, gray mullet, wrasse, smelt, flying fish, anchovies, sea bream, porgies, garfish, or any of the chief representatives of the order Pleuronecta, such as sole, flounder, plaice, dab, and brill, simply because of the dizzying speed with which the Nautilus hustled through these opulent waters. As for marine mammals, on passing by the mouth of the Adriatic Sea, I thought I recognized two or three sperm whales equipped with the single dorsal fin denoting the genus Physeter, some pilot whales from the genus Globicephalus exclusive to the Mediterranean, the forepart of the head striped with small distinct lines, and also a dozen seals with white bellies and black coats, known by the name monk seals and just as solemn as if they were three-meter Dominicans. For his part, Conseil thought he spotted a turtle six feet wide and adorned with three protruding ridges that ran lengthwise. I was sorry to miss this reptile, because from Conseil’s description, I believe I recognized the leatherback turtle, a pretty rare species. For my part, I noted only some loggerhead turtles with long carapaces. As for zoophytes, for a few moments I was able to marvel at a wonderful, orange-hued hydra from the genus Galeolaria that clung to the glass of our port panel; it consisted of a long, lean filament that spread out into countless branches and ended in the most delicate lace ever spun by the followers of Arachne. Unfortunately I couldn’t fish up this wonderful specimen, and surely no other Mediterranean zoophytes would have been offered to my gaze, if, on the evening of the 16th, the Nautilus hadn’t slowed down in an odd fashion. This was the situation. By then we were passing between Sicily and the coast of Tunisia. In the cramped space between Cape Bon and the Strait of Messina, the sea bottom rises almost all at once. It forms an actual ridge with only seventeen meters of water remaining above it, while the depth on either side is 170 meters. Consequently, the Nautilus had to maneuver with caution so as not to bump into this underwater barrier. I showed Conseil the position of this long reef on our chart of the Mediterranean. “But with all due respect to master,” Conseil ventured to observe, “it’s like an actual isthmus connecting Europe to Africa.” “Yes, my boy,” I replied, “it cuts across the whole Strait of Sicily, and Smith’s soundings prove that in the past, these two continents were genuinely connected between Cape Boeo and Cape Farina.” “I can easily believe it,” Conseil said. “I might add,” I went on, “that there’s a similar barrier between Gibraltar and Ceuta, and in prehistoric times it closed off the Mediterranean completely.” “Gracious!” Conseil put in. “Suppose one day some volcanic upheaval raises these two barriers back above the waves!” “That’s most unlikely, Conseil.”