386 - On the Amphipod Orchestia tucurauna. 
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 pereeopod become broad- 
ened ; this is not shown in any of my specimens nor in the 
type of O. sulensoni. 
I do not consider these differences in the descriptions 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 O. sulensoni. 
Orchestia tucurauna appears to belong to that section of 
the genus containing O. chiliensis, M.-Edw., O. miranda, 
Chilton, and O. platensis, Kréyer, 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 t>» be broadened. 
O. pickeringui, Dana, should perhaps also be grouped in the 
same section. 
REFERENCES. 
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 8B. “The Biological Relations of the Subantarctic Islands of 
New Zealand.” Ibid. pp. 798-807. 
1915. “ Deto, a Subantarctic Genus of Terrestrial Isopoda.”- Journ. 
Linn. Soe. vol, xxxii. pp. 455-456, pls. xxxix. & xl. 
Finno1, H. 
1885. “Mission de l’ile Campbell,” in Recu. Passage Vénus, vol. iii. 
2nd pt., Crustacea, pp. 349-510, pls. xxxvili.—lv. 
Mét.irr, Frirz. 
1869. Facts and Arguments for Darwin (translated from the German 
by W.S. Dallas). John Murray, London, 1869. 
STEBBING, I’. R. R 
1899, “ Amphipoda from the Copenhagen Museum and other Sources. 
: —Part II.” Trans, Linn. Soc., Zool. vol. vii. pp. 395-4382, 
Is. XXX.-XXXV. 
1906. Amphipoda. 1. Gammaridea. ‘ Das Tierreich,’ 21 Lieferung. 
Berlin, September 1906. 
