120 Rev. A. M. Norman’s Notes on British Amphipoda. 
As observed by Bate northern specimens greatly exceed in 
size those from southern localities. A Spitzbergen specimen 
in my collection measures (exclusive of antenne) 37 millim. 
in length; large British examples measure 23 millim., while 
in a series from Cornwall the greatest length is only 12 
millim. 
The larger the specimen the more strongly marked are the 
sculpture and elevation of both dorsal spines and carina. In 
its younger stages there are no dorsal carinal teeth, the eye is 
small and nearly round, and the state is accurately represented 
by Bates’s figure of Graia imbricata. But Graia imbricata 
is described and figured as having no secondary appendage 
to the antennules. The young always have such an appen- 
dage, though it is reduced to two articulations. My North- 
umberland specimens of Grava imbricata, taken by the late 
Mr. Alder and recorded by Bate, were preserved dry, which 
may account for the appendage having been overlooked ;_ they 
were undoubtedly the young of the present species. _ It is not 
improbable that Mr. Webster’s specimens were similarly pre- 
served, as that gentleman sent to myself Amphipods only in 
that state. The fine figures of Buchholz may be consulted 
with advantage, and the difference in armature of pereopods, 
uropods, &c. there shown in the young and the adult have 
their warning lesson against the establishment of species on 
slight variations *. 
Hab. Mostly taken in tide-pools among weeds ; Shetland ; 
Firth of Clyde; Durham and Northumberland coasts; the 
Humber; Devon and Cornwall (A. VW. N.): Mus. Norm. 
Liverpool Bay (A. O. Walker). 
Distribution. Spitzbergen (Lovén); Tromsé (Schnedder) : 
Mus. Norm. Greenland (Ross &c.); Siberia (Stuaxberg) ; 
Norway (Rathke d&c.); Sweden (Lilleborg); Denmark 
(Meinert) ; Kiel (Blanc); Western France (Chevreaux &c.) ; 
Boulogne (Chevreaux) ; North-east America (Stimpson). 
Genus IJ. Mretpuipippa, Boeck, 1870. 
Mandibles with a short and very narrow palp, third joint 
shorter than the second. first maxille having the inner 
lamina moderately broad but not long, inner margin with 
numerous plumose sete. Mazillipeds with narrow elongated 
palps; outer lamina short, broad, with a few small teeth on 
the inner margin. orm elongated, especially the pleon ; 
segments of pleon armed on the hinder margin with teeth of 
* British young examples in my collection 3-4 millim. long exactly 
agree with Buchholz’s figure of that stage. 
