. Fishes. Fishes. Suborder Heterosomata 695 of the Jurassic or Cretaceous, and that their origin is prior to the development of the great perch stock. If one were to guess at the nearest relationships of the group, it would be to regard them as allies of the deep-bodied mackerel- like forms, as the StromateidcE, or perhaps with extinct Berycoid forms, as Platycormus, having the ventral fins wider than in the mackerel. Still more plausible is the recent suggestion of Dr. Boulenger that the extinct genus Amphistmm resembles the primi- tive fiotmder. But there is little direct proof of such relat
. Fishes. Fishes. Suborder Heterosomata 695 of the Jurassic or Cretaceous, and that their origin is prior to the development of the great perch stock. If one were to guess at the nearest relationships of the group, it would be to regard them as allies of the deep-bodied mackerel- like forms, as the StromateidcE, or perhaps with extinct Berycoid forms, as Platycormus, having the ventral fins wider than in the mackerel. Still more plausible is the recent suggestion of Dr. Boulenger that the extinct genus Amphistmm resembles the primi- tive fiotmder. But there is little direct proof of such relation, and the resemblance of larval flotmders to the ribbon-fishes may have equal significance. But the ribbon-fishes themselves may be degenerate Scombroids. In any case both ribbon-fishes and. Fig. 599—Platophrys lunatus (Linnseus), the Peacock Flounder. Family Pleuronedidce. Cuba. (From nature by Mrs. H. C. Nash.) floimders find their nearest living relatives among the Bery- coidei or Zeoidei, and have no affinity whatever with the isocercal codfish or with other members of the group called Anacanthini. The Heterosomata are found in ah seas, always close to the bottom and swimming with a swift, undulatory motion. They are usually placed in a single family, but the degraded types known as soles may be regarded as formmg a second family. The Flounders: Pleuronectidse.—In the flounders, or Plemonec- tidcB, the membrane-bones of the head are distinct, the eyes large and well separated, the mouth not greatly contracted, and the jaws. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Jordan, David Starr, 1851-1931. New York, H. Holt and Company
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