REVISION OF L.M.B.C. AMPHIPODA. 317 



first joint three times as long as the remaining two. The 

 first joint of the second gnathopods and two first pairs of 

 peraeopods are conspicuously yellow. Colour grey with 

 transverse bars of brown. Length 6 mm. 



Erichthonncs abditus (Templeton). 



Point of Ayr ; Puffin Island, 14 f . ; Little Orme ; Menai 

 Straits ; 16 m. N. of Holyhead, 50 f . ; Port Erin Harbour, 

 Length 8 mm. 



Erichthonius difformis, M. Edwards. 



Port Erin — electric light; Laxey Bay, 4 to 12 f., 

 24/9/92, very abundant in tubes on Zostera. Length 6 mm. 



Cokophiid^. 



Siphoncecetes colletti, Boeck. 



Off Garwick Head, 4 to 12 f., 24/9/92; Port Erin Har- 

 bour; Little Orme. Length 3 mm. 

 Corophium grossipes (Linn). 



Mud banks in the estuary of the Dee ; tidal ditch in 

 Ehos Bay ; Menai Straits. Occurs in immense numbers 

 wherever there are mud banks left bare by the tide. 

 There are hundreds of acres of such banks in the Dee 

 closely perforated by its burrows. It forms an important 

 part of the food supply of the various wading birds, and 

 of fish. Length 7 mm. 



Corophium crassicorne, Bruzelius. 



G. spinicome — Bate, Brit. Mus. Cat., female. 



G. bonellii, M. Edw. — Bate and West., Brit. Sess. 



Crust., female. 

 C. crassicorne, Bruz. — Delia Valle, Gam. des 



Golfes v. Neapel, female. 

 C. crassicorne, Bruz. — Bate and West., Brit. Sess. 

 Crust., male. 

 Little Orme, 5 to 10 f., 5/10/93. The immature male 

 has a row of spines on the penult, joint of the lower ant, 



