AMPHIPODA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 499 
A special variety of the species was obtained as follows :— 
South Africa, entrance to Saldanha Bay ; 25 fathoms. 21st March 1904. 
This species is one that is very widely distributed in sub-Antarctic seas, and is usually 
found in shore pools or in shallow waters around the coast. It has been pointed out by 
several authors that specimens of it vary considerably ; probably when the different 
forms are carefully compared it may be possible to distinguish several local varieties, 
but I think, in the present state of our knowledge, that Mr Sressrne is right in uniting 
the various forms under this one name. 
Through the kindness of the authorities of the Hamburg Museum I have been able 
to examine the type and other specimens of Stebbingia gregaria Pfeffer, and | find 
that they undoubtedly belong to this species. Several of them are of comparatively 
large size, but they show no distinction of importance from the ordinary form, and the 
small accessory flagellum of the upper antenna is present. Various authors have 
deseribed this accessory flagellum as being absent in the specimens examined by them, 
and, though I have usually been able to find it, there are a few specimens that I have 
seen in which I have been unable to do so, although in all other points they seem to 
belong to the species; and there seems little doubt, as pointed out by WaLxker and 
others, that in this as in some other species the small accessory flagellum may some- 
times be actually absent; probably this is more commonly the case in older forms. 
Of the local varieties I can at present indicate two :— 
(1) The form described under the name Atylus megalophthalmus Haswell. In this 
form the head has a rostrum nearly half as long as the first joint of the upper antenna ; 
the accessory flagellum, though apparently present, is small, short, and fused to the third 
joint of the peduncle ; and the telson has the posterior portion of each lobe somewhat 
rounded and without sete. 
(2) The forms mentioned above from South Africa, Saldanha Bay. In general | 
appearance, and in the antennex and gnathopods, etc., these agree closely with forms from 
other localities, but they differ somewhat markedly in the telson, the posterior portion 
of each lobe of which is cut into three or four acute teeth and is without sete. In 
some forms from other localities there may be two such teeth, but, so far as I know, not 
more, and the telson usually bears two or more long setze on each lobe. The telson in 
the Saldanha Bay variety closely resembles that described by CHrvreux for Atylozdes 
longicorms from Port Charcot, etc., a species which appears to me to be little more than 
a variety of Paramera austrina in which the accessory flagellum is absent and the 
enathopods are rather small. 
Even in the more typical forms there seems to be considerable variation in the size 
and shape of the gnathopods. In some the propod is oblong, with the palm almost 
transverse, as shown by Mr Sressine in his drawings of Atyloides australis Miers; in 
others the propod is more oval, with the palm somewhat oblique; the length of the 
carpus is also subject to variation, and the sete seem to be more abundant on the 
antenne and gnathopods in some specimens than in others. 
