386 On the A tnphipod OvcheatiaL tixcavRuna. 



process on the base of the finger and the corresponding 

 depression in the palm are quite the same as in the New 

 Zealand specimens and are very distinctive of the species. 

 His figure of the second gnathopod of the female shows the 

 limb shorter and stouter and the basal joint much broader 

 than in my specimens. As already mentioned, he states that 

 in old males the joints of the fifth perseopod become broad- 

 ened ; this is not shown in any of my specimens nor in the 

 type of 0. sulensoni. 



I do not consider these differences in the descri|)tions and 

 figures sufficient to counterbalance the close resemblance in 

 the distinctive character of the second gnathopod of the male, 

 supported as it is by Miiller's account of the coalescence of 

 the basal joints of the flagellum of the second antenna and 

 by the resemblances in other characters to those given by 

 Stebbing for 0. suIe7isoni. 



Orchestia tucwauna appears to belong to that section of 

 the genus containing 0. chiliensisj M.-Edw., 0. miranda, 

 Chilton, and O.platensis, Kroyer, in which there is a tendency 

 in the males for the second antenna to become stout and for 

 some of the joints of the fifth perseopod to be broadened. 

 0. pickeriugii, Dana, should perhaps also be grouped in the 

 same section. 



Eeferences. 



Chilton, C, 



1909 A. " The Crustacea of the Subantarctic Islands of New Zealand." 

 The Subantarctic Islands of New Zealand, pp. 601-671 (with 

 19 figures in the text). Wellington, N.Z., 1909. 



1909 B. " The Biological Relations of the Subantarctic Islands of 

 New Zealand." Ibid. pp. 79S-807. 



1915. " Deto, a Subantarctic Genus of Terrestrial Isopoda." Journ. 

 Linn. Soc. vol. xxxii. pp. 436-456, pis. xxxix. & xl. 



FiLHOL, H. 



1885. " Mission de I'ile Campbell," in Recu. Passage V^uus, vol. iii. 

 2nd pt., Crustacea, pp. 349-510, pis. xxxviii.-lv. 



MULLER, FllITZ. 



1869. Facts and Arguments for Darwin (translated from the German 



by W. S. Ltallas). John Murray, London, 1869. 

 Stebbing, T. II. R 



1899. " Amphipoda from the Copenhagen Museum and other Sources. 



—Part II." Trans. Linn. Soc, Zool. vol. vii. pp. 395-432, 



pis. xxx.-xxxv. 

 1906. Au)phipoda. 1. Gammaridea. ' Das Tierreich,* 21 Lieferung. 



Berlin, September 1906. 



