. Contributions to a monograph of the Amphipoda Hyperiidea. Hyperiidea. KONGL. SV. VET. AKADBMIENS HANDLINGAR. BAND. 22. N:0 7. 157 the outer margin is smooth; the inner margin is serrated along the lower half of its length, with spine-like teeth; the inner ramus is elongate-lanceolate, serrated on the lower parts of both margins with spine-like teeth. The second pair reach to the apex of the peduncle of the last pair; the peduncle is linear, twice as long as broad, scarcely longer than the inner ramus; the outer ramus is elongate, sharp-pointed; the outer margin is smooth, the inner serrated
. Contributions to a monograph of the Amphipoda Hyperiidea. Hyperiidea. KONGL. SV. VET. AKADBMIENS HANDLINGAR. BAND. 22. N:0 7. 157 the outer margin is smooth; the inner margin is serrated along the lower half of its length, with spine-like teeth; the inner ramus is elongate-lanceolate, serrated on the lower parts of both margins with spine-like teeth. The second pair reach to the apex of the peduncle of the last pair; the peduncle is linear, twice as long as broad, scarcely longer than the inner ramus; the outer ramus is elongate, sharp-pointed; the outer margin is smooth, the inner serrated as in the first pair; the inner ramus is elongate-lanceolate, serrated as in the preceding pair. The third pair have the peduncle very broad, abruptly constricted at the base, scarcely more than a third longer than broad at the apex; the outer ramus is lanceolate, longer than the breadth of the peduncle, but not equal to its length; the inner ramus is nearly as long as the outer; both rami are serrated as in the first pair. The telson is as broad as long, obtusely triangular, equalling in length the last ural segment; it is a little broader than the peduncle of the last pair of uropoda, and more than half as long as the same peduncle. The female. PL IX, fie. 17— Hyperia medusarum, 0. F. Muller. ') Fig. 1. The animal from the side. 2. The first pair of antennae. 3. The dactylus of the first pair of peneopoda. The body, especially the perason, is only a little wider than in the male; the pleon and urus together are much shorter than the person. The head is a little broader than deep. The first pair of antennas (Fig. 2 above) reach scarcely below the under margin of the head; the peduncle is thick and stout; the first joint is cylindrical, as long as broad, and twice as long as the two following joints together; the second joint is only a little longer than the third. The flagellum is one-jointed, much longer than the whole ped- uncle, but not fully twice as long; it is broa
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