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"Diagram of the anterior fin (archipterygium) of Ceratodus." — Galloway

Archipterygium

"Diagram of the anterior fin (archipterygium) of Ceratodus." — Galloway

"Burbot (Lota vu'garis), with jugular ventral fins." — Encyclopedia Britannica, 1893

Burbot

"Burbot (Lota vu'garis), with jugular ventral fins." — Encyclopedia Britannica, 1893

"Dissected fish. a, air bladder; b, urinary bladder; b, urinary bladder; br, brain; c, spinal cord; d and da, dorsal fins; dv, anal fin; e, body of the vertebra; g, gills receiving the blood from the ventral aorta leading out of the heart h; i, intestine; k, kidney; l, liver; m, spines of the vertebra; n, auricle of the heart; ov, ovary; ovd, oviduct; st, stomach; sp, spleen; u, ureter." —Davison, 1906

Dissected Fish

"Dissected fish. a, air bladder; b, urinary bladder; b, urinary bladder; br, brain; c, spinal cord;…

An illustration of a fish fin.

Fish Fin

An illustration of a fish fin.

"Section of <em>Ampioxus</em>, fr, fin ray; ct, connective tissue; nc, notochord, ; snc, supraneural crest"&mdash;Finley, 1917

Section of a lancelet

"Section of Ampioxus, fr, fin ray; ct, connective tissue; nc, notochord, ; snc, supraneural…

"Side view of <em>Amphioxus</em>: fs, fin supports; nc, notochord; ot, oral tentacles."&mdash;Finley, 1917

Side view of lancelet

"Side view of Amphioxus: fs, fin supports; nc, notochord; ot, oral tentacles."—Finley,…

"Mullus barbatus (Red Mullet), with thoracic ventral fins." &mdash; Encyclopedia Britannica, 1893

Red Mullet

"Mullus barbatus (Red Mullet), with thoracic ventral fins." — Encyclopedia Britannica, 1893

A rudder supported on a skeg or projection from the keel, about one third of its surface being forward and two thirds abaft its vertical axis.

Balance Rudder

A rudder supported on a skeg or projection from the keel, about one third of its surface being forward…

"Salmo salar (Salmon), with abdominal ventral fins." &mdash; Encyclopedia Britannica, 1893

Salmon

"Salmo salar (Salmon), with abdominal ventral fins." — Encyclopedia Britannica, 1893

"Saurus undosquamis, a Malacoptorgian with anterior soft dorsal and additional adipose fin." &mdash; Encyclopedia Britannica, 1893

Saurus Undosquamis

"Saurus undosquamis, a Malacoptorgian with anterior soft dorsal and additional adipose fin." —…

<i>Pristis pectinatus</i>. "1. An elasmobranchiate or selachian fish of the family <i>Pristidae</i>, having the snout prolonged into a flat saw or serra beset on each side with horizontal teeth pointing sidewise." &mdash;Whitney, 1889

Sawfish, Side View

Pristis pectinatus. "1. An elasmobranchiate or selachian fish of the family Pristidae, having the snout…

<i>Pristis pectinatus</i>. "1. An elasmobranchiate or selachian fish of the family <i>Pristidae</i>, having the snout prolonged into a flat saw or serra beset on each side with horizontal teeth pointing sidewise." &mdash;Whitney, 1889

Sawfish, View from Underneath

Pristis pectinatus. "1. An elasmobranchiate or selachian fish of the family Pristidae, having the snout…

"The seal, adapted principally for water. The extremities are larger than in the porpoise and manatee."&mdash;Pettigrew, 1874

The Seal

"The seal, adapted principally for water. The extremities are larger than in the porpoise and manatee."—Pettigrew,…

<i>Liparis lineata</i>. A fish of the genus <i>Liparis</i>; so called from their soft unctuous feel, and their habit of adhering to rocks by means of a ventral sucker. <p>This illustration shows the sucker present on the underside of the fish, between the pectoral fins.

Snailfish - Sucker Between the Pectoral Fins

Liparis lineata. A fish of the genus Liparis; so called from their soft unctuous feel, and their habit…

"A fin-spine; one of the unjointed and unbranched sharp bony rays of the fins, such as those the presence of which gives name to the acanthopterygian fishes; a spinous fin-ray, as distinguished for a soft ray." <p>Illustration of the anal fin of the acanthopterygian fish.

Three Spines on the Anal Fin of a Bony Fish

"A fin-spine; one of the unjointed and unbranched sharp bony rays of the fins, such as those the presence…

"Pectoral girdle and fin of a Teleost. br.o., branchial ossicles; c, coracoid; cl., clavicle; f.r., fin rays; p.cl., post clavicle; p.t., post temporal which unites with skull; sc., scapula; s.cl., supra-clavicle." &mdash; Galloway

Teleost

"Pectoral girdle and fin of a Teleost. br.o., branchial ossicles; c, coracoid; cl., clavicle; f.r.,…