REVISION OF L.M.B.C. AMPHIPODA. 429 



This species seems to prefer rocky ground while *S^. marina 

 is found on sand, I have not met with it E. of Menai 

 Straits. 



Metopa alder i (Bate). 



Menai Bridge, April and May, '94, 7 to 12 f. ; Turbot 

 Hole, Puffin Island. Colour white with red blotches on 

 second, third, and fourth epimeres and first joint of cor- 

 responding legs, also on the urus. Length 4J mm. 



Metopa borealis, Sars. 



Little Orme, 5 to 10 f., common ; Menai Straits ; Puffin 

 Island, 14 f. Colour uniform white or grey. Length 

 2 mm. 



Metopa pusilla, Sars. 



Khos Bay just below tide mark, 13/5/93 ; Menai Bridge, 

 7 to 12 f., 2/4/94. White, tinged with red on the back 

 and limbs. Length 2 mm. 



Metopa rubro-vittata, Sars. 



Little Orme, 4 to 7 f. ; Colwyn Bay, 2J f. ; Menai 

 Bridge. One specimen was beautifully and uniformly 

 speckled with bright red. This species is best distinguished 

 by the spine on the posterior margin of the propodos of 

 the first gnathopods. Length 2^ mm. 



Metopa hruzelii (Goes). 



Colwyn Bay and Little Orme, common ; off Port Erin, 

 24 f., 5/6/92; Port Erin harbour, Nov. '92 (I. C. T.). 

 Colour white with large blotches of brilliant red on front 

 segments and epimeres. Length 2 J mm. 



Cressa dicbia (Bate). 



Great and Little Ormes ; Colwyn Bay ; Menai Straits ; 

 10 to 17 m. N.W. of Mersey Bar; 2 m. S.E. of Kitter- 

 land. Isle of Man, 27/5/94, 17 fath. Colour pale yellow 

 clouded with red on fifth, sixth, and seventh segments of 

 peraeon. Length 2 mm. 



