REPORT ON THE AMPHIPODA. 313 



it ; 4. "Autojwe erythrophthalma (Liljeborg)," for the Gammarus (Gammarojms) erythroph- 

 thalvms of Liljeborg, since called Gammaropsis erythropldlialmus ; 5. AutoTwe longipes, 

 Liljeborg, for Gammarus longipes, LDjeborg, 1852, which Boeck accepts as the type of the 

 genus Autonoii ; 6. Autonoe macronyx, Liljeborg, pi. i. fig. 6, for Gammarus macroiiyx, 

 Liljeborg, 1853, identified by Boeck with Profomedeia fasdata, Kr0yer, 1842. To 

 Amphifhot', Leach, Bruzelius assigns the species, 1. podocer aides, Rathke, with alho- 

 VMculata, Kroyer, for a synonym, and 2. pygmxa, Liljeborg, which Boeck identifies with 

 "Photis EeinJiardi," Kr0yer, 1842. 

 In "EamiliallL Orchestid^, Dana," Bruzelius places, 1. Orchestia, Leach, with the species 

 littorea, Leach, including Euchore, F. MiiUer; 2. Allorcliestes, Dana, with the species "Allor- 

 ehestes Nilsoni (Eathke)," in the synonymy of which he gives " Amphithoe Prevosti?, H. 

 Kathke; Amyhithoe Nilssoni, H. Rathke; Orchestia Mdrosiensis, Krojei " ; remarking also 

 that he feels tolerably certain that Rathke's and Kroyer's species are identical with the one 

 he himself describes, but of Milne-Edwards' he is doubtful, as the figure seems to show two 

 rami on the last uropods. Brandt's subgenus Allorchestina he considers unnecessary. 



In " Familia IV. G-AMMARiDiE, Dana," Bruzelius describes nineteen genera. The species which 

 he calls Anonyx nanus, Kroyer?, was called Anonyx nanoides by Lilljeborg in 1865, 

 while the Anonyx minutus, Kroyer, which he thinks perhaps identical, is called Orcliomene 

 ininut'us by Boeck. " Anonyx Kroyeri," n. s., pi. ii. fig. 7, was transferred to Callisoma by 

 Spence Bate. Ponioporeia furcigera, n. s., pi. ii. fig. 8, is said by Sars in 1882 to be the 

 same as the earlier Pontoporeia femm'ata, Kr0yer. Bruzelius says that in his species the 

 accessory flagellum of the upper antennae has three joints as against two in Kr0yer's 

 species, and that Pontoporeia furcigera is much smaller Xhwa. femorata, while he has always 

 found that iu individuals of the same species the number of joints in the flagella increases 

 or diminishes with the size of the animal. Also the fork-like process on the fourth 

 segment of the abdomen is considerably larger than in Pontoporeia femorata. 



For Gammarus, Fabrioius, Bruzelius draws up a scheme including thirteen species, which have 

 since been distributed among various genera. " Gammarus Loveni," n. s., pi. ii. fig. 9, 

 was transferred to Mxra by Spence Bate. Gammarus Ixvis, n. s., pi. iL fig. 10, was 

 identified by Spence Bate with Gammarus longimanus (Leach), Thompson, which Spence 

 Bate places in the genus Meganiosra. Gammarus brevicornis, n. s., pi. iii. fig. 11, is 

 identified in Bate and Westwood with Liljehorgia pallida, Spence Bate. 



The new genus Eriopis, is thus defined : — 



"Corpus elongatum, parum compressum, epimeris parvis. Antenna superiores pedunculo 

 gracili et flagello appendiculari perpusillo instructje ; inferiores subpediformes. I\IandibuloB 

 duobus ramis, tuberculo molari et palpo triarticulato instructse. Maxilla primi paris palpo 

 biarticulato ornata. Palpus pedum maxillarium e quatuor articulis compositus. Pedes 

 primi secundique paris manu (articulo quinto) subcheliformi armati. Tria paria 

 posteriora pedum thoracis postice gradatim longiora. Rami pedum abdominalium ultimi 

 paris valde intequales ; interior brevis, exterior abdominis longitudinem fere requans, 

 duobus articulis complanatis iustructus." This genus is identified by Boeck with 

 Niphargus, Schi0dte, 1851, which had hitherto contained only fresh- water species. 

 Eriopis elongata, n. s., pi. iii. fig. 12, "habitat in locis profundis maris Bohusiae." This is 

 called by Boeck Niphargus elongatus. 



The new genus Paramphithoe is thus defined : — 



"Corpus compressum, epimeris mediocribus aut magnis. Oculi duo compositi. Antenna 

 superiores gi-aciles, articulo tertio pedunculi articulis flagelli crassiore, sed flagello appendi- 

 cular! carentes. Mandibula palpo triarticulato. Palpus maxillae primi paris biarticulatus, 

 pedum maxillarium e quatuor articulis compositus. Pedes primi secundique paris manu 

 subcheliformi instructi. Pedes septimi paris reliquis pedibus nou duplo longiores. Pedes 



(ZOOL. CHALL. EXP. PART LXVII. — 1887.) Xxx 40 



