The American journal of science and arts . i/i,mrt 71 SnHn /rt/. CALIGI^S J) n^i^e/f. ffhtmaa &.Cf^. PI. V. risMS ?Am. Jpw. SciAroi.£my:M; CALIGrS AMERICANUS Description of a Species of Caligus. 265 also evident from the nature of the organs that follow. The spacecontained within the U suture in the Argulus is the analogue ofthe much larger and more distinctly separated segment, which wehave called the cephalic in the above description. The anteriorabdominal joint of the Caligus is wholly wanting in the Argulus ;and the valves in the circulation which occupy the posterior tho

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The American journal of science and arts . i/i,mrt 71 SnHn /rt/. CALIGI^S J) n^i^e/f. ffhtmaa &.Cf^. PI. V. risMS ?Am. Jpw. SciAroi.£my:M; CALIGrS AMERICANUS Description of a Species of Caligus. 265 also evident from the nature of the organs that follow. The spacecontained within the U suture in the Argulus is the analogue ofthe much larger and more distinctly separated segment, which wehave called the cephalic in the above description. The anteriorabdominal joint of the Caligus is wholly wanting in the Argulus ;and the valves in the circulation which occupy the posterior tho-racic joint, far from the extremity of the body, have an analo-gous situation in the Argulus, close to the last joint of the joint being small in the Argulus forms a very distinct and reg-ular heart, and serves to keep up a much more active circulationthan in the Caligus, where the corresponding part is large andless energetic in its action. It is remarkable that the circulationin the two should be the reverse in almost every particular; theventral current instead of being upward in the Argulus runs to-wards the terminal joint of the body;

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