206 REPORT ON /OOLOGY, MDCCCXLI1I. 



(2) Iphimedio, so far very nearly related to the genus Leucothoe, that 

 the legs (if the first pair also in it terminate in nippers, but those of the 

 second pair possess nearly the same kind of hand as Gammarus and 

 Ampldtliof ; 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 antenna; 

 are composed not of two, but those of the superior of three, and of the infe- 

 rior of four joints, and that the superior antennae are not longer but shorter 

 than the inferior. /. obesa, plentiful near Christianssund. 



New species of the coasts of Norway (ib.) are : Gammarus anomalus, Sun- 

 devallii, pcecilimis, Krbyeri, angulosus, zebra ; Amphithoe tenuicornis, podoce- 

 roides, Prevostii, Edw. ? noreegica ; Podocerm capillatits, calcaratus. 



The order Lsemodipoda has been abolished by Kroyer, and united with 

 the Amphipoda. in a memoir, 'Description of some new genera and species 

 of the Caprellina, with introductory remarks on the Lsemodipoda, and their 

 place in the system.' (Natur. Hist. Tidsskr. iv, p. 490.) This is entirely 

 in accordance with nature, since they present in common with the Amphi- 

 poda even the essential character, that the seven anterior segments of the 

 body have branchial vesicles, but with the limitation, that in this family legs 

 and branchial vesicles are not both present together, but, normally, where the 

 latter occur the former are wanting, and vice versa. Hence, and in con- 

 sequence of the stunted condition of the caudal portion, they constitute 

 a peculiar family, which the author designates as the Lsemodipoda, and 

 divides into two groups, Caprellina and Cyamea. 



In the group of the Caprellina the author, in addition to the two genera 

 Leptomera, Latr., and Caprella, Lam., gives two new ones : (1 ) Cercops, 

 the second ring of the body with legs and branchial sacs, as in Leptomera, 

 caudal portion distinct, five-jointed, with 4 longer two-jointed appendages. 



(2) JEgina, the second segment with legs, but without branchial vesicles ; 



caudal portion, distinct, two-jointed, with 4 appendages. Mandibles with 



three-jointed palpi. 



The author has described (1. c. p. 499-585), Leptomera pedata, Abildg., 



from the Sound, Cercops Holbdlli, Kr., from Greenland, JEgina longicornis, 



Kr., do., Caprella Januarii, 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 Christianssuud. 



Kathke (1. c. p. 94) has distinguished the observed species of the 



Caprellina 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, Rouss. d. V. (Naturhist. Tidsskr, iv, p. 



474.) 



