They consist of two distinct series: the series of bony fish, in other words, those whose spines have vertebrae made of bone; and cartilaginous fish, in other words, those whose spines have vertebrae made of cartilage.

"But tell me, are you familiar with the differences between bony fish and cartilaginous fish?""Just maybe, Conseil."

"As for cartilaginous fish," Conseil went on unflappably, "they consist of only three orders."

Conseil looked at it with purely scientific fascination, and I'm sure he placed it, not without good reason, in the class of cartilaginous fish, order Chondropterygia with fixed gills, family Selacia, genus Squalus.

Here are the ones that the Nautilus's nets most frequently hauled on board: rays, including spotted rays that were oval in shape and brick red in color, their bodies strewn with erratic blue speckles and identifiable by their jagged double stings, silver-backed skates, common stingrays with stippled tails, butterfly rays that looked like huge two-meter cloaks flapping at middepth, toothless guitarfish that were a type of cartilaginous fish closer to the shark, trunkfish known as dromedaries that were one and a half feet long and had humps ending in backward-curving stings, serpentine moray eels with silver tails and bluish backs plus brown pectorals trimmed in gray piping, a species of butterfish called the fiatola decked out in thin gold stripes and the three colors of the French flag, Montague blennies four decimeters long, superb jacks handsomely embellished by seven black crosswise streaks with blue and yellow fins plus gold and silver scales, snooks, standard mullet with yellow heads, parrotfish, wrasse, triggerfish, gobies, etc., plus a thousand other fish common to the oceans we had already crossed.

From the fish branch there were manta rays, enormous cartilaginous fish ten feet long and weighing 600 pounds, their pectoral fin triangular, their midback slightly arched, their eyes attached to the edges of the face at the front of the head; they floated like wreckage from a ship, sometimes fastening onto our windows like opaque shutters.

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