AMPHIFODA AND ISOPODA OF TIIK FIRTH OF CLYDE. 65 



and taken off the coast of Northumberland by the 

 late Mr. Joshua Alder. 



This species is now considered to be only a variety 

 of P. rimapalmata, 



podoceropsis undata, Spence Bate. 



Ncenia undata, Spence Bate, Cat. Amph. Brit. Mus., 

 p. 272, pi. xlvi., fig. 5. 



Habitat.— Among the roots of Laminar la saeeharina, 

 in 10 fathoms, bottom mud and Melobesia; and south 

 of Little Cumbrae, in 25 fathoms, soft black mud. 

 Taken also off the coast of Northumberland by Mr. 

 Joshua Alder. 



Genus Corophium, Latreille. 

 corophium grossipes, Liime. 



Cancer grossipes, Liime, Sys. Nat. (1767), Ed. 12, v., 

 80, p. 1055. 



Oniscus vohitator, O. F. Muller, Zool. Dan. Prodr. 

 (1776). 



Gammarus grossipes, Fabricius, Genera Insectorum 

 (1776), p. 248. 



Astaeus linearis, Pennant, Brit. Zool. (1777), iv., p. 

 17, pi. 16, fig. 31. 



Gammarus longicornis, Fabricius, Sys. Ent. (1775), 

 ii., p. 515. 



? Gammarus parvus, Fabricius, Reise nach Nor- 

 wegen (1779), p. 258. 



Corophium longicorne, Latreille, Gen. Crust, et Ins. 

 (1807), i., p. 59. 



Corophium grossipes, Templeton, Mag. Nat. Hist, 

 and Jour., ix. (1836), p. 12. 



Habitat. — Between tide -marks. Balloch Bay, Cum- 

 brae ; Koseneath ; Langbank, near Port-Glasgow. A 

 batch of them were lately sent me by Mr. John 

 Smith, Kilwinning, from the mouth of the Garnock, 

 where, as at Langbank, they do not seem to object 

 to a bath of brackish water. I have taken them 

 plentifully at Oban, a little to the north of Dunolly 

 Castle. They burrow in mud and stiff clay ; and 

 where they occur in colonies, as they mostly do, 



