Crustacea.] SUBANTARCTIC ISLANDS OF NEW ZEALAND. 645 



Genus Allorchestes, Dana, 1849. 

 Distribution. — Widely distributed. 



Allorchestes novae-zealandiae, Dana. 



Allorchestes novi-zealandiae ( 2 ), A. intrepida ( <? ), Dana, P. Amer. Ac, 

 ii, p. 207, 1852, and U.S. Expl. Exped., xiii, ii, p. 894, pi. Ixi, figs, a-v, 

 1853 and 1855 ; Thomson, Trans. N.Z. Inst., xxi, p. 260, pl. xiii, fig. 3, 

 1889 ; Stebbing, " Das Tierreich Amphipoda," p. 581, 1906 ; Walker, 

 Ann. & Mag. Nat. Hist., ser. 8, ii, p. 39, 1908. 



Of this species I have several specimens, both male and female, from Ewing 

 Island, collected by Dr. L. Cockayne in July, 1903. It was also taken at Enderby 

 Island by Mr. Hodgson during the voyage of the " Discovery." The specimens 

 agree well with the description as given by Stebbing in " Das Tierreich Amphipoda." 



The species is widely distributed about the coast of New Zealand, and probably 

 extends also to South America. 



Fam. AOEIDAE. 



Genus Aora, Kroyer, 1845. 



Distributio7i.~Contaim& only the following species, which is widely distributed 

 in the Atlantic, Pacific, and Southern Oceans. 



Aora typica, Kroyer. 



Aora ttjpica, Kroyer, Naturh. Tidsskr., ser. 2, i, p.' 328, pl. iii,' figs.? 3 a-l, 

 1845; Chilton, Ann. & Mag. Nat. Hist., ser. '5, xvi, p. '370, ' 1885 ; 

 Stebbing, " Das Tierreich Amphipoda," p. 587, 1906. 



Further synonymy will be found under the reference last quoted. 



A single male specimen from Musgrave Harbour,^ Auckland Island, taken in 

 seine net (E. R. Waite) ; also a female specimen collected by Professor Benham. 

 The male specimen belongs to the form which I have described under the name 

 " Aora typica ^ , form 1 " {I.e., p. 370). 



Under the name Aora typica Mr. Stebbing has united various forms previously 

 known by distinct names, so that the species as now understood by him has a wide 

 range, being known from the North Atlantic with adjoining seas (Europe), Pacific 

 (South America, Australia, New Zealand), Southern Indian Ocean (Kerguelen 

 Island). It includes at least three different forms of the male, differing in the 

 character of the first gnathopod. Of this, Mr. Stebbing says, "The second joint in 

 adult male (typica) is said to have a triangular process on the front margin," a state- 

 ment somewhat unduly cautious, seeing that the triangular process in question 

 was described and figured by Nicolet, mentioned by Spence Bate and by C M. 

 Thomson, and that as far back as 1885 I described and figured it, and also suggested 

 a possible function for it. 



This particular form of the male is known from the coasts of Chili as well as 

 from New Zealand, but I do not know of any record of its being found elsewhere. 

 In New Zealand it is associated with a second male form, wliich appears to be the 

 same as the form described as A. gracilis by Bate from British seas ; while in Australia 

 there is a third form, difiering in several small details. For these several male forms 



