2 Transactions. 



it will be seen from what is recorded below that Mr. Thomson's description 

 was a composite one based on specimens belonging to more than one species. 



In the next year Mr. Thomson described and figured another new 

 species under the name Panoploea debilis, also from Dunedin Harbour, 

 the genus Panoploea being new and including P. debilis and P. spinosa, 

 another new species described at the same time (1880, p. 3). 



In 1882 I had identified specimens collected at Lyttelton Harbour as 

 Panoploea debilis G. M. Thomson, and later on was able to compare them 

 with specimens from Dunedin named by Mr. Thomson and to ascertain 

 that they were identical with his species. This species proved to be 

 moderately common in New Zealand seas, and was long known to New 

 Zealand workers under the name Panoploea debilis G. M. Thomson. 



In 1893 Delia Valle placed the species in the genus Acanthozone as a 

 doubtful synonym of Acanthozone longifnana (Boeck), a species which is 

 now placed under the genus Leptamphopus, and remarked that Pherusa 

 novae-zealandiae G. M. Thomson seemed to coincide with Panoploea debilis 

 G. M. Thomson. 



In his account of the Amphipoda Gammaridea in Das Tierreich, 

 Stebbing (1906, p. 294) includes both Pherusa novae-zealandiae and 

 Panoploea debilis under the name Leptamphopus novae-zealandiae (G. M. 

 Thomson), but without making any reference to the differences in the 

 descriptions of, the two species as given by Thomson. In 1903, before 

 Stebbing's Das Tierreich Amphipoda was published, Mr. A. 0. Walker, 

 in his account of the " Southern Cross " Antarctic Expedition, had 

 described and figured a new genus and species, Oradarea longimana (1903, 

 p. 56), and in the appendix of Das Tierreich Amphipoda Stebbing quotes 

 this species and says of it " strangely like Leptamphopus novae-zealandiae " 

 (1906, p. 727). 



In 1906 Chevreux recorded Oradarea longimana Walker from Flanders 

 Bay and other localities in Graham Land visited by the French Antarctic 

 Expedition, 1903-5 (1906, p. 54). 



In his account of the Amphipoda of the National Antarctic Expedition, 

 Walker in 1907 records Oradarea longimana from Coulman Island and other 

 localities visited by the expedition, and in a footnote referring to Stebbing's 

 remarks points out that his species differs from Thomson's description of 

 Pherusa novae-zealandiae '' in having only the first two pleon segments 

 dorsally j)roduced into one tooth, instead of the two posterior segments 

 of the mesosome and two anterior of the pleon produced into two teeth ; 

 also in t^ie upper antennae having an appendage " (1907, p. 32). 



In 1909, in the account of the Crustacea in the Snbantarctic Lslands of 

 New Zealand, I followed Stebbing in considering Panoploea debilis to 

 be the same as Pherusa novae-zealandiae, and recorded the species under 

 the name Leptamphopus novae-zealandiae (G. M. Thomson), from Carnley 

 Harbour, in Lord Auckland Islands, and after comparing it with Walker's 

 description came to the conclusion that Oradarea longimana Walker was 

 identical with Leptamphopus novae-zealandiae (G. M. Thomson), as Stebbing 

 had suggested, the differences pointed out by Walker being apparently due 

 to individual variation or to errors in the descriptions (1909, p. 621). In 

 his account of the Amphipoda of the second French Antarctic Expedition, 

 1908-10, Chevreux adopted this view, referred specimens from Petermann 

 Island to Leptamphopus novae-zealandiae (G. M. Thomson), and gave a 

 few further particulars of the s])ecies. This species was collected by the 

 Scottish National Antarctic Expedition at South Orkneys, and was recorded 

 by me in the account of the Amphipoda of the expedition under the name 

 Leptamphopus novae-zealandiae (G. M. Thomson) (1912, p. 488). 



