. A guide to the study of fishes. Fishes; Zoology; Fishes. Isospondyli 41 orbitosphenoid, have been lately transferred to the Haplomi by Boulenger. This arrangement is probably a step in advance. Ganoid traits are present in certain families of Isospondyli. Among these are the gular plate (found in Amia and'theElopidcz), doubtless derived from the similar structure in earlier Ganoids; additional valves in the arterial bulb in the cellular air-bladder of Notopterus and Osteoglossum, the spiral intestinal valve in ChirocentridcB, and the ganoid scales of the extinct Lepto- lepidaz. The Clupeoide
. A guide to the study of fishes. Fishes; Zoology; Fishes. Isospondyli 41 orbitosphenoid, have been lately transferred to the Haplomi by Boulenger. This arrangement is probably a step in advance. Ganoid traits are present in certain families of Isospondyli. Among these are the gular plate (found in Amia and'theElopidcz), doubtless derived from the similar structure in earlier Ganoids; additional valves in the arterial bulb in the cellular air-bladder of Notopterus and Osteoglossum, the spiral intestinal valve in ChirocentridcB, and the ganoid scales of the extinct Lepto- lepidaz. The Clupeoidea.—The Isospondyli are divisible into numerous families, which may be grouped roughly under three subdivisions, Clupeoidea, the herring-like forms; the Salmonoidea, the trout-like forms; and the Iniomi, or lantern-fishes, and their allies. The last-named group should probably be removed from the order of Isospondyli. In the Clupeoidea, the allies of the great family of the herring, the shoulder-girdle is normally developed, retain- ing the mesocoracoid arch on its inner edge, and through the post-temporal is articulated above with the cranitim. The fishes in this group lack the adipose fin which is characteristic of most of the higher or salmon-like families. The Leptolepidse.—Most primitive of the Isospondyli is the extinct family of Leptolepidce, closely allied to the Ganoid families of Pholidophoridce and Oligopleuridce. It is composed of 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
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