New /Zealand A)njjJiij>0!l. 571 



Sautith'rsii supposed to come from South Africa ; consc- 

 qneiiily in 18J>5 * I transt'ened my .s|)ecics to the genus 

 iStl'dy but k'tt its identity or otherwise with S. Sainidersii an 

 o|)en question, and the New Zeahuid species was given under 

 the name Seba tt/pka in the " C'ritical List of the New 

 Zoahind Crustacea" published in 1^80 by ^Ir. G. JI. Thomsoa 

 and myself f. 



In the collections made by the ' Challenger' Mr. Stebbing 

 found a single female specimen from Station 313 off Cape 

 Virgins, Patagonia, which he referred to Seba Saundersii, 

 Stebbing, and he considered my New Zealand species to be 

 identical with this, assuming the form I had described with 

 rather large subchelate first gnathopods to be the male J. It 

 will be noted that Air. Stebbing had himself seen no males of 

 liis species. The oidy difference pointed out by Mr. Stebbino- 

 between his specimens and the New Zealand ones was in the 

 first joint of the upper antenna, wjiich I had described as being 

 equal in length to the second, while in his original specimen 

 the second joint was a little longer and in the 'Challenger'' 

 specimen decidedly longer. In 1892 § I published a short 

 note accepting Mr. Stebbing's view as to the identity of the 

 New Zealand specimens with his and as to the male sex of 

 the forms with the larger gnathopods. 



In 1889 II, among tlie Ampliipoda collected by the 

 ' Ilirondelle,' M. Chevreux described under the name 

 Grimaldia arviata a species from the Gulf of Gascony which 

 he afterwards ^ described very fully under the name Seba 

 armata and compared at some length with S. Saundersii^ 

 pointing out various differences. As some of the differ- 

 ences were based ujjon the assuuiption that the New Zealand 

 ppecics belongs to the true S. Saundersii, Stebbing, and as it 

 app( ars desirable, as shown below, to consider the New Zealand 

 specimens as a distinct species, it follows that these differences 

 may not serve to distinguish S. armata from the true 

 6'. JSaundtrsii, Stebbing. 



Mr. A. O. Walker, in working out the Ampliipoda collected 

 by the National Antarctic Expedition, has found several 

 specimens of Seba Saundersii, Stebbing, and as he finds that 

 in them the first gnathopods of the males do not differ 

 appreciably from those of the female, and therefore differ 



« N. Z. Journ. of Science, ii. p. 3i'0. 



f Trans. N. Z. Inst, xviii. p. 148. 



X Kep. on 'Challenger' Auiphipoda, p. 783, pi. xlix. 



§ Trans. N. Z. Inst. xxiv. p. iJfKJ. 



II IJull. Soc. Zool. de l*'rftuce, xiv. p. i'84. 



11 ' l{esultat.>i des C'ainpafrn..-.-? Sticutili<iues p.ir Albert 1" de Mouaco, 



fasc. xvi. p. iii. j)!. xiii. tijj. 1. 



