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REPORT ON ZOOLOGY, MDCCCXLI1I.

(2) Iphimedia, so far very nearly related to the genus Leucothoe, thatthe legs of the first pair also in it terminate in nippers, but those of thesecond pair possess nearly the same kind of hand as Gammarus andAmphithoe ,• differing, however, in this respect, that the pollex of its nipper-feet is constituted not of two but of one joint, that the stems of the antennaeare composed not of two, but those of the superior of three, and of the infe-rior of four joints, and that the superior antennee are not longer but shorterthan the inferior. I. obesa, plentiful near Christianssund.

New species of the coasts of Norway (ib.) are: Gammarus anomalus, Sun-devallii , pcecilurus, Kroyeri, angulosus , zebra ; Amphithoe tenuieornis, podoce-roides, Prevostii, Edw. ? nonegica ; Podocerus capillatus, calcaratus.

The order Lsemodipoda has been abolished by Kroyer, and united withthe Amphipoda, in a memoir, ‘Description of some new genera and speciesof the Caprellina, with introductory remarks on the Lsemodipoda, and theirplace in the system.’ (Natur. Hist. Tidsskr. iv, p. 490.) This is entirelyin accordance with nature, since they present in common with the Amphi-poda even the essential character, that the seven anterior segments of thebody have branchial vesicles, but with the limitation, that in this family legsand branchial vesicles are not both present together, but, normally, where thelatter occur the former are wanting, and vice versa. Hence, and in con-sequence of the stunted condition of the caudal portion, they constitutea peculiar family, which the author designates as the Lsemodipoda, anddivides into two groups, Caprellina and Gyamea.

In the group of the Caprellina the author, in addition to the two generaleptomera, Latr., and Caprella , Lam., gives two new ones : (I) Cercops ,the second ring of the body with legs and branchial saes, as in Leptomera,caudal portion distinct, five-jointed, with 4 longer two-jointed appendages.(2) Adgina, the second segment with legs, but without branchial vesicles ;caudal portion, distinct, two-jointed, with 4 appendages. Mandibles withthree -jointed palpi.

The author has described (1. c. p. 499-585), Leptomera pedata , Abildg.,from the Sound , Cercops Holbblli, Kr., from Greenland , Adgina longicornis,Kr., do., Caprella Jamarii, Kr., C. dilatata, Kr., both from Rio de Janeiro ,C. septentrionalis , in the North Sea , from Greenland to the Cattegat , C.lobata (Squill, lob. Mull.), C. hystrix, Kr., from Christianssund.

Rathke (1. c. p. 94) has distinguished the observed species of theCaprellina found on the coast of Norway , viz. Caprella Phasma, Lam.,C. acuminifera, Leach, (?) C. Scolopendroides, Lam., and Leptomera pedata,Lam.

The genus Cyamus has been illustrated by Kroyer, who gives two species :C. Ceti, L., and C. erraticus, Kouss. d. Y. (Naturhist. Tidsskr, iv, p.474.)