AMPHIPODA AND ISOPODA OF THE FIRTII OF CLYDE. S'S 



Habitat. — Dredged off Muggie Point, Little Cum- 

 brae, in 14 fathoms, bottom stones, small gravel, 

 and Laminaria saccharina. Taken off Anstruther,. 

 Firth of Forth, by Mr. Goodsir. 



Family IBOTEIBM. 



Genus I dote A, Fabricius. 



idotea tricuspidata, Desmarest. 



Idotea tricuspidata, Desmarest, Cons. Crust., p. 289.. 



Oniscus tridens, Scopoli, Ent. Carniolica. 



Idotea Entomon, Pennant, Brit. Zool., iv., pi. 18, f. 5- 



Idotea Basteri, Audouin, Descr. of Savigny, Egypt. 

 Crust., pi. 12, f. 6. 



Idotea tridentata, Latreille, Con. Crust, et Ins., i., 

 p. 64. 



Idotea variegata, Roux, Crust. Mediter., pi. 30, f. 1-9. 



Armida bimarginata, Risso, H. N. l'Eur. Merid., 5, 109. 



Habitat. — Common among sea-weed brought up in 

 the dredge, especially on dead weeds, and sometimes 

 occurring in great abundance. A large patch of 

 Halidrys siliquosa, brought up on a fisherman's line 

 at Cumbrae, was swarming with hundreds of this 

 species. They are occasionally taken in the surface- 

 net, on floating sea- weed. Bate and Westwood state 

 that the largest they have seen "measures one inch 

 and five lines, and another one inch and a quarter : 

 the former from the Cheshire coast, the latter off 

 the Dudman on the coast of Cornwall." * One I 

 have from Loch Fyne measures 1J inch. 



Common round the sea-board of England, Scotland,, 

 and Ireland. 



idotea pelagica, Leach. 



Idotea pelagica, Leach, Trans. Linn. Soc, xi., p. 365. 

 Idotea marina, Fabricius, Ent. Sys., Suppl., p. 303? 

 Oniscus balthicus, Pallas, Spic. Zool., ix., t. 4, f . 6 ? 

 Rhcetia pelagica, Leach, MSS. 



* Brit. Sessile-eyed Crustacea, vol. ii. f p. 382. 



