610 SUBANT ARCTIC ISLANDS OF NEW ZEALAND. [Crustacea. 



them. So far as I can make out, Mr, Stebbing's specimens from the Falkland 

 Islands belong to H. planatus as described above, while the forms from Australia 

 which he refers to H. ovatus, Stimpson, are probably the same as those from New 

 Zealand which Filhol has described under the name H. tridentatus ; but unfor- 

 tunately Mr. Stebbing does not seem to have described the condition of the marginal 

 teeth of the carapace in his specimens. The Cape Horn specimens undoubtedly 

 belong to the true H. planatus, and in all probability so do those from Kerguelen 

 Island and from the Cape of Good Hope. If this be so, it would appear that the 

 true J?, 'planatus is the subantarctic species of circumpolar distribution, while it is 

 represented in the main islands of New Zealand and in Australia by the variety 

 described by Filhol as H. tridentatus. Certainly, all the forms from the mainland 

 of New Zealand that I have seen belong to the latter variety. It is true that Filhol 

 speaks of H. 'planatus as being found on the whole extent of the coast of New Zealand ; 

 but here I think he is rather quoting the results of previous authors, who had failed 

 to distinguish between the two varieties, than giving the actual distribution of 

 H. planatus as he understood it. Miers indirectly refers to the question in his 

 report of the '' Challenger " Brachyura, for he distinguishes between H. flanatus 

 (Fabricius) and H. ovatus (Stimpson), and refers specimens from Cape Campbell, 

 New Zealand, to H. planatus, while he assigns to H. ovatus only some specimens 

 from Australia. If my observations are trustworthy, it is more probable that the 

 Cape Campbell specimens should be referred to H. ovatus, if that species is really 

 the same as H. tridentatus ; and in cases like this, where minute characters are 

 concerned, it is perhaps not desirable to attach too much importance to one single 

 identification made when a large amount of material is being examined. 



While it is perhaps rash to hazard an opinion, I strongly suspect that Liriopea 

 leachii, Nicolet {=Hymenosoma leachii, Guerin), and L. lucasii, JSicolet, described 

 in Gay's " Historia de Chile," both belong to H. planatus (sens. str.). 



Genus Hymenosoma, Desmarest, 1823. 

 Distribution. — Widely distributed in southern seas. 



Hymenosoma depressum, Jacq. et Luc. 



Hymenosoma depressum, Jacquinot et Lucas, Voy. au Pole sud, Zool., iii, 

 Crust., p. 62, pi. V, figs. 34-39, 1885 ; Chilton, Ann. & Mag. Nat. Hist., 

 ser. 7, xix, p. 148, pi. v, figs. 1-4, 1907. 



Recorded from Auckland Islands by Hombron and Jacquinot. Also found on 

 the coasts of New Zealand. 



Section Anomura. 



Genus Porcellanopagurus, Filhol, 1885. 



Distribution. — Snares and Campbell Islands, Australia, and Juan Fernandez. 



Porcellanopagurus edwardsi, Filhol. 



Porcellanopagurus edwardsi, Filhol, " Mission de I'lle Campbell," p. 410, 

 pi. xlix, figs. 2-4, 1885; G. M. Thomson, Trans. N.Z. Inst., xxxi, 

 p. 187, 1899. 



