REPORT ON THE AMPHIPODA. 1133 



1879. Podocerus falcatus, Hoek, Carciuologisches, p. 120, pi. viii. figs. 13-15; pi. ix. figs. 1-3. 



1880. „ ,, Nebeski, Beitriige zur Kenntniss der Amph. der Adria, p. 41, pi. iv. 



fig. 44. 

 1882. ,, „ Sars, Oversigt af Norges Crustaceer, pp. 31, 112. 



1885. ,, „ Carus, Prodi-onius Faunae Meiliterranese, pars ii. p. 394. 



1887. ,, ,, Bonnier, Catal. Crust. Malac. Concarneau, p. 111. 



To give what is now supposed to be the full synonymy of Podocerus falcatus, would 

 be to repeat the great majority of the references already given for the genus. Leach is 

 inclined to adopt the name Jassa falcata for Montagu's species, but he does not definitely 

 adopt it. Meinert, Chevreux, Koehler, and perhaps some other writers, have used the 

 actual name Podocerus falcatus, but as a rule I do not think it necessary to enlarge 

 the synonymy of a species by references to simple catalogue names. It will be of interest 

 here to notice how the grouping of various forms and various names under one species has 

 gradually arisen. In 1857 Spence Bate in his Synopsis, giving the species " P. falcatus 

 (Montagu)," but omitting Jassa pelagica, Leach, remarks in a footnote, " It is usual to 

 divide this genus into two, Podocerus and Jassa, but there is great reason to believe that 

 the difference is merely sexual. It is evidently synonymous with Dana's genus 

 Cratophium; the species C. validum being almost identical with P. pulchellus." 

 Norman in 1869, mentioning five species of Podocerus, makes " Podocerus falcatus 

 {Montagu)" the fourth, and "Podocerus pelagians (Leach)" the fifth, but in reference 

 to the place of capture, says of the latter, " With the last, of which I believe it to be the 

 female. I have never met with a male pelagicus, nor a female falcatus. The two forms 

 occur in company, and the structural differences seem confined to the exact form of the 

 hand of the gnathopods, organs which seem generally to differ among the Amphipoda 

 according to the sex." Boeck in 1870 and 1876 places in the synonymy of Podocerus 

 falcatus, Montagu, the species Jassa pulchella, Leach, Jassa pelagica, Leach, Cerapus 

 pelagicus, Milne-Edwards, Podocerus calcaratus, Rathke, and Podocerus monodon, 

 Heller. In regard to the union of the three forms named respectively falcatus, pulchellus, 

 and pelagicus, Metzger and Meinert imply their agreement with Boeck, and Hoek 

 definitely expresses and gives reasons for his. Nebeski in 1880 adds the form known 

 as Podocerus variegatus, Leach, which Boeck had named Janassa variegata, at the same 

 time making Podocerus capillatus, Rathke, a synonym of it. Bonnier in 1887 accepts 

 the whole group thus united, but presumably on the authority of the various authors 

 mentioned. 



Lower Antenrm. — In the male specimen the flagellum has six joints, the first much 

 longer than any of the following ; in the female specimen the flagellum has only two 

 joints, the first long and stout. Boeck in describing Podocerus falcatus says that the 

 flagellum of the lower antennae has five joints, of which the first is the longest; for Janassa 

 ■variegata he says that this flagellum is composed of a long first joint, which is narrower 

 than the last joint of the peduncle, but nearly as long, and of two short joints. 



