KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 169 



»Aiitenna' subequal; the superior being ratlier the longer, equally (.sic) tlie entire hnigtli of 

 the animal.» 



In 1870 A. BoECK gavc a new diagiiosis of Hyperia Latreillci, using the naine 

 H. medusarum: 



»Pedes Imi paris manu non lata, extrorsum gradatiiii angustiore, in rnargine posteriore 

 serrata et spinis nonnullis armata; carpo extrorsum multo latiore; calce uon ad mediara inanum 

 porrecta. Pedes 2di paris manu paulo angustiore; calce multo longiore qvam Imi paris. Pedes 

 saltatorii ultimi paris pedunculo dnplo longiore qvam lato. Appendix caudalis parum longior 

 qvam ad basin lata, et ad medium pedunculum pedum saltatorium ultimi paris porrecta.» 



In 1872 he repeated the same Latin diagnosis and gave an elaborate description 

 and drawings of the species, which doabtless prove that the animal he described under 

 the name Hyperia medusarum was a true H. Latreillei. I translate here beloAV the 

 most iinportant part of his description: 



»The first joint of the first pair of legs is very broad and flattened, with the front margin 

 strongly convex. The second and third joints are very short, with slender bristles on the hind 

 part of the hind margin. The third joint grows broader distally, and is provided at the lower 

 hind corner with a small heel, which is rounded at the apex; its hinder and lower margin are armed 

 with bristles. The fifth joint is somewhat curved, is narrower towards the apex, and is set with 

 many small bristles on the inner margin, and some larger ones on the outer side. The second 

 pair of legs are similar to the first pair, but the heel of the carpus is much longer, and the hand 

 (= metacarpus) more slender, with a longer claw. The third joint of the third and fourth 

 pairs is a little broader, but shorter than the fourth joint, which again is shorter than the fifth. 

 The last three jsairs of legs are of about the same shape and length. Their first joint is dilated, 

 and about twice as long as broad, or a little longer. The third joint is only a little dilated, and 

 about as long as the fourth joint, which is shorter than the fifth. The first pair of uropoda 

 reach farther back than the second pair. The rami are elongated, lanceolate, the outer being 

 a little shorter than the inner. The rami of the second pair are shorter than those of the 

 first pair, and somewhat broader in comparison. The outer ramus of the third pair is a little 

 longer than the inner one and only a little shorter than the peduncle; the inner ramus is lan- 

 ceolate, and provided on both margins with small spines. The t el son is somewhat longer 

 than it is broad at the base, rounded at the apex, and a little more than half as long as the 

 peduncle of the last pair of uropoda.» ') 



In 1884 H. Blanc described our species under the name Hyperia galha, from the 

 west part of the Baltic, giving a good account of the glands within the perasopodä, 

 and illustrating it by drawings. 



In 1887 I briefly pointed out the specific difference between Hyperia medusarum., 

 H. Latreillei, and H. c/albaJ) The same year H. J. Hansen recorded Hyperia La- 

 treillei, but without giving any description. 



^) The wording-, 1. c. p. SI, is »Halevedhcieiiget er — — — — ubetydelig Ifengere end Skaftet paa det 

 sidste Par af Springf0dder", but this is evidently a misprint for » — — — ubetydelig laeiigere end halvdelen af 

 Skaftet etc»; compare his Latin diagnosis quoted above. 



^) C. BoVALLius. »Arctic and Antarctic Hyperids». "Vega-Exp. Vetensk. Iakttagelser. Bd. 4, p. 

 561—563. 



K. Sv. Vet. Akad. Handl. Band. 2'i. N:o 7. 



22 



