624 SUBANTARCTIC ISLANDS OF NEW ZEALAND. [Crustacea. 



pected in such large specimens. My specimens have the hind margin of the third 

 pleon segment slightly convex, with the lower angle produced into a very short tooth, 

 just as shown in Chevreux's figure of Bovallia gigantea. In all other respects I can 

 find no difference between my specimens and those described by Chevreux, and I 

 feel compelled to unite Bovallia gigantea and Eusiroides monoculoides. It is true 

 that Stebbing in his latest work has placed Eusiroides and Bovallia in different 

 families, but a comparison of his diagnoses for these families will, I think, show 

 that there is no distinct or constant point of difference between them. 



The two genera Eusiroides and Bovallia were both published in the same year 

 (1888), but as Stebbing in the second volume of his report on the " Challenger " 

 Amphipoda, in which he describes Eusiroides, refers to Bovallia (see p. 1653) it is 

 evident that the latter genus has priority of publication, and I therefore adopt it, 

 and place it, as Stebbing has done, in the Pontogeneiidae. 



Mr. A. 0. Walker has stated that Atylus walkeri, Stebbing ( = A. antarcticus , 

 Walker),* from Cape Adare and other antarctic localities, is nearly related to Bovallia 

 gigantea, Pfeffer, though he gives various differences in the keels on the segments 

 of the body and in other respects. In view of the facts stated above, some of these 

 differences lose much of their importance, and it is quite possible that A. walkeri 

 may prove to be near to, or perhaps even identical with, the species now under dis- 

 cussion ; the gnathopods, however, as figured by Walker, have the palm less oblique, 

 and Walker makes no mention of the numerous calceoli which are so conspicuous a 

 feature in the descriptions by Stebbing and Chevreux of the forms examined by 

 them. 



Genus Pontogeneia, Boeck, 1871. 



Distribution. — Widely distributed both in northern and in southern seas. 



Pontogeneia antarctica, Chevreux. 



Pontogeneia antarctica, Chevreux, Exped. antarct. fran9aise, Amphipoda, 

 p. 69, figs. 40, 41, 1906. 



Numerous specimens of this species were gathered at Campbell Island and at 

 Carnley Harbour, Auckland Islands, by Professor Benham in February, 1907, 

 and Dr. L. Cockayne had previously given me specimens from the Antipodes 

 Islands. 



These agree very closely with M. Chevreux's figures and description. Tiie species 

 is very near to P. danai (G. M. Thomson), so common on the coasts of New Zealand, 

 but differs in having every third joint of the flagellum of the upper antenna pro- 

 duced below, and bearing a tuft of sensory setae, while in P. danai every fourth 

 joint is produced, and the prominence thus caused is more evident. Chevreux's 

 specimens were from Flanders Bay and Booth Wandel Island. 



As at present known, the genus contains, in addition to the two species 

 mentioned above, only P. inermis (Kroyer), from the Arctic Ocean and North 

 Sea. Another species, P. magellanica (Stebbing), is placed under the genus 

 in " Das Tierreich Amphipoda," but I think it fits better under Atyloides (see 

 below, p. 627). 



* Journ. Linn. Soc, xxix, p. 58; and Nat. Antarct. Exped., Amphipoda, p. 34. 



