Crustacea.] SUBANTARCTIC ISLANDS OF NEW ZEALAND. 647 



distal angle of the anterior margin subacutely produced ; the carpus is nearly 

 as long as the propod and about the same width, and bears on its posterior margin 

 four transverse rows of setae ; the propod is suboblong, the width about three- 

 fourths the length, the palm slightly oblique, defined by a prominent tooth, near the 

 base of which is a slight rounded prominence on the palm, the finger fitting into 

 the depression between the two, while the rest of the palm is slightly concave ; 

 numerous transverse rows of setae are found along both margins and also on the 

 side of the propod. 



The differences in appearance of the gnathopods in this specimen from Stebbing's 

 figure are so great that one would hardly think of suggesting that it belongs to 

 the same species but for a knowledge of the great changes that may take place in 

 appendages like this, which are specially modified in males ; and I think it is 

 very probable that Mr. Stebbing's description was taken from an immature male, 

 while the specimen described above represents a more mature male of the same 

 species. 



Since this was written I have received ]\Tr. Walker's paper quoted above, in 

 which he also points out that the " Challenger " specimen was probably immature, 

 and that an adult male from Kerguelen might appear very different from the specimens 

 examined by him. The additional description that he gives agrees, on the whole, 

 with ray Snares specimen, and also with the Campbell Island specimen, except as 

 regards the gnathopoda, and thus tends to confirm my opinion that the latter is an 

 adult male of Lemhos kergueleni, Stebbing. This opinion has since been fully con- 

 firmed by an examination of the New Zealand specimens which Mr. Thomson has 

 kindly placed at my disposal, for among them I find forms quite intermediate between 

 that described by Mr. Stebbing and the form with very large propod and oblique 

 palm in the second gnathopod described above. 



After this was in type I found another specimen of this species in Mr. G. M. 

 Thomson's collection, in a tube containing specimens of Hyale novae-zealandiae from 

 Macquarie Island (collected by Mr. A. Hamilton), thus still further extending its 

 range in antarctic seas. 



Fam. Jassidae. 



Grenus Jassa, Leach, 1813-14. 

 Distribution. — In all seas. 



Jassa pulchella, Leach. 



Jassa pulchella, Leach, Edinb. Enc, vii, p. 433, 1813-14 ; Stebbing, " Das 

 Tierreich Amphipoda," pp. 654, 739, 1906. Bruzeliella falcata, Norman, 

 Ann. & Mag. Nat. Hist., ser. 7, xvi, pp. 83, 92, 1905 ; i Walker, Trans. 

 Linn. Soc, Zool., xii, p. 343, 1909. 



Full synonymy will be found in Stebbing's " Das Tierreich Amphipoda." 

 A specimen of this cosmopolitan species was taken on the carapace of Halicar- 

 cinus flanatus, at Auckland Island. Mr. Thomson and I have frequently taken 

 tliis species adhering to the body of Jasus edwardsii, and its wide distribution is 

 probably to be partly accounted for by its habit of attaching itself temporarily to 

 this and others of the larger Crustacea. 



