138 Rev. A. M. Norman’s Notes on British Amphipoda. 
Hab. Common all round our coast between tide-marks. 
Distribution. This species is found apparently everywhere 
throughout the arctic and boreal regions, and, as will be seen 
by the above synonymy, has received many names from 
different localities. [ have carefully compared specimens 
from Spitzbergen, Greenland, and the United States with 
others from our own coasts. It extends also southwards as 
far as Naples (Costa), South-west France (Barrois Gc.) ; 
Cullera, Spain (Don Pedro Antiga, in Mus. Norm.). 
A large British example in my collection measures 34 
millim.*, and one from Spitzbergen reaches 38 millim. 
The telson, of which one half is figured (Pl. XII. fig. 11), 
is elongated and each half usually bears three terminal spines 
and a seta at the extremity, a spine and seta ata short distance 
from it, and two spines and one or two sete near the base. 
A certain latitude must be allowed as to the exact number of 
setee and spines on the telsons in the genus Gammarus ; but 
the general character in each species appears to be constant. 
2. Gammarus marinus, Leach. (Pl. XII. fig. 12.) 
1815. Gammarus marinus, Leach, Linn. Trans. vol. xi. p. 359. 
1830. Gammarus Olivit, H. Milne-Edwards, Ann. des Sci. Nat. vol. xx. 
p. 369, pl. x. fig. 9. 
1837. Gammarus gracilis, Rathke, Zur Fauna der Kryn. p. 374, pl. v. 
figs. 7-10. 
1840. Gammarus affinis, Milne-Edwards, Hist. Nat. des Crust. vol. iii. 
. 47, 
1843, Gammarus Kréyeri, Rathke, Beitr. zur Fauna Norwegens, p. 69, 
pl. iv. fig. 1. 
1853. Gammarus pecilurus, id. ibid. p. 68, pl. iv.-fig. 2. 
1862. Gammarus marinus, Bate & Westw. Brit. Sessile-eyed Crust. 
vol, 1. p. 370. 
Hab. Common round the British coasts. 
Distribution. From Norway to the Bay of Biscay ; Adri- 
atic Sea (Heller) ; North-east America (S. LZ. Smith): Mus. 
Norm. 
The telson (Pl. XII. fig. 12) has each half terminated by 
three spines and a spine at the side near the base ; sometimes 
there is the small seta as figured near the extremity, but it is 
by no means always present; rarely there are one or two 
sete: at the extremity, but the character of the telson as dis- 
tinguished from that of allied species is the entire absence or 
fewness of sete. 
* All measurements in these papers are exclusive of the antennules, 
but include the uropods unless otherwise stated. 
