. Fishes. Fishes. Series Plectognathi 623 more or less distinctly scaly. The teeth are separate and incisor-like and the form is compressed. In the Ostracodermi {oarpciKoi, a box; Sipjua, skin) there is no spinous dorsal, the teeth are slender, and the body is inclosed in an immovable, bony box. In the Gymnodontes {yv/xv6?, naked; oSovs, tooth) the teeth are fused into a beak like that of a turtle, either con- tinuous or divided by a median suture m each jaw, the spinous dorsal is lost, and the body is covered with thorns or prickles or else is naked. The Scleroderms.—The Sclerodermi include t
. Fishes. Fishes. Series Plectognathi 623 more or less distinctly scaly. The teeth are separate and incisor-like and the form is compressed. In the Ostracodermi {oarpciKoi, a box; Sipjua, skin) there is no spinous dorsal, the teeth are slender, and the body is inclosed in an immovable, bony box. In the Gymnodontes {yv/xv6?, naked; oSovs, tooth) the teeth are fused into a beak like that of a turtle, either con- tinuous or divided by a median suture m each jaw, the spinous dorsal is lost, and the body is covered with thorns or prickles or else is naked. The Scleroderms.—The Sclerodermi include three recent and one extinct families. Of the recent forms, Triacanthidcs is the most primitive, having the ventral fins each represented by a stout spine and the skin covered with small, rough scales. The dorsal has from four to six stiff spines. Triacanthodes anomalus is found in Japan, Hollardia hol- lardi in Cuba. Triacanthus brevirostris, with the first spine very large, is the common hornfish of the East Indies ranging north- ward to Japan. The Trigger-fishes: Balistidae.—The BalistidcB, or trigger-fishes, have the body covered with large rough scales regularly ^\' Fig. 514.—The Trigger-fish, Balistes carolinensis Gmelin. Xew York. The first dorsal fin is composed of a short stout rough spine, with a smaller one behind it and usually a third so placed that by touching it the first spine may be set or released. This. 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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