138 Rev. A. M. Norman's Notes on British Amphipoda. 



Hah. 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, lias received many names from 

 different localities. I have carefully compared specimens 

 from Si)itzbergen, Greenland, and the United States with 

 others from our own coasts. It extends also southwards as 

 far as Naples {Costa), South-west France [Barrois &c.)\ 

 Cullera, Spain [Don Pedro Antiga, in Mus. Norm.). 



A large British example in my collection measures 34 

 millim."^, and one from Spitzbergen readies 38 millim. 



The telson, of which one half is figured (PI. XII. fig. 11), 

 is elongated and each half usually bears three terminal spines 

 and a seta at the extremity, a spine and seta at a short distance 

 from it, and two spines and one or two setas near the base. 

 A certain latitude must be allowed as to the exact number of 

 setfe and spines on the telsons in the genus Gammarus ; but 

 the general character in each species appears to be constant. 



2. Gammarus marinus, Leach. (PI. XII. fig. 12.) 



1815. Gammarus marinus, Leach, Linn. Trans, vol. xi. p. 3o9. 



1830. Gammarus Olivii, H. Milne-Edwards, Ann. des Sci. Nat. vol. xx. 



p. 360, pi. X. fig. a _ 

 1837. Gammarus gracilis, Ratlike, Zur Fauna der Kryn, p. 374, pi, v. 



figs. 7-10. 

 1840. Gammarus affinis, Milne-Edwards, Hist. Nat. des Crust, vol. iii. 



p. 47. 

 1843. Gammarus Ei'dyeri, Rathke, Beitr. zur Fauna Norwegens, p. 69, 



pi. iv. fig. 1. 

 1853. Gammarus pccciliirus, id. ibid. p. 68, pi. iv. fig. 2. 

 1862. Gammarus marinus. Bate & Westw. Brit. Sessile-eyed Crust. 



vol. i. p. 370. 



Hah. Common round the British coasts. 



Distribution. From Norway to tlie Bay of Biscay ; Adri- 

 atic Sea {Heller) ; North-east America (*S'. /. Smith) : Mus. 

 Norm. 



The telson (PI. 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 

 setffi at the extremity, but the character of the telson as dis- 

 tinguished from that of allied species is the entire absence or 

 fewness of setee. 



* All measurements in these papers are exclusive of the anteunules, 

 but include the uropods unless otherwise stated. 



