284 THE ANTARCTIC MANUAL. 
The Amphipods of this region are probably very numerous indeed ; 
the Challenger expedition added about fifty species to the half-dozen 
previously known. Many of the genera, Anonyx, Tryphosa, Hippo- 
medon, Orchomene, Lysianax, ete. are common and widely distributed, 
and in some cases the species are very similar to their northern allies, 
e.g. Hoplonyx cicadoides (Stebb.), to the northern H. ezcada (Fabr.) 
In one instance the Kerguelen specimen is pronounced identical with 
a northern form, viz. Podocerus falcatus (Mont.), but it 1s suggested 
as possible that the creature may have been carried southward by the 
ship; in another such case, viz. Hustrus longipes, Bk., Sars holds that 
the two forms are scarcely identical. But on the other hand the 
Kerguelen area contains a number of markedly southern genera, of 
which other species are known either from the Australian or the 
Patagonian regions, or from both of these, e.g. Acontiostoma, Atyloides, 
Haplocheira ; a considerable number of genera are as yet known only 
from Kerguelen, e.g. Socarnoides, Cardenio, Acanthechinus, Harpini- 
oides, Zaramilla, Dodecas, Protellopsis ; the last three, at least, of these 
are highly peculiar. 
Of the numerous Isopods, one species, Hurycope fragilis, F.E.B., 
is known also from Japan, and with this exception all the rest are 
confined to the Southern seas. Of the genera, Serolis is highly charac- 
teristic of the Patagonian and Antarctic regions; Arcturides, Iolanthe, 
Astrurus, Neasellus, are all remarkable genera peculiar as yet to the 
Kerguelen area, while according to Stebbing, the Kerguelen species 
of 'Anceus and of Ilyarachna are also sufficiently distinct to deserve 
the rank of genera. Many of the above genera, and also the species 
of Apseudes, Tanais, Munna, Pleurogonium and others, are very 
remarkable, and mark out the Isopod fauna of this region as particularly 
worthy of close attention. 
Of Chetopods, apart from those mentioned above in the descrip- 
tion of the shallow-water fauna, we know of somewhat over thirty 
species, mostly referred to northern or cosmopolitan genera, one genus 
only, Salvatoria, M‘Int., being described as peculiar. Of the species, 
three are said to be sub-species or varieties of the northern Let- 
monice producta, Grube, Scolecolepis cirrata, Sars, and Terebellides 
Stroemit, Sars. A few others, Lagisca magellanica, M‘Int., Eunice 
magellanica, M‘Int., and three species of Hermadion, are known 
also from the Patagonian region. Nereis Kerguelensis, M‘Int., extends 
to South Georgia; while of the remainder every one is either peculiar 
to Kerguelen or extends only to the adjacent islands. 
Of five species of Brachiopods, two extend to the Patagonian 
region, Waldheimia (Magellania) dilatata, Lam., and Terebratella 
