224 HISTORY OF BRITISH CRUSTACEA. 



gitudinal line. The tail with three teeth, the middle one 

 longer than the others. The antennae reach to the third ring 

 of body. 



Not uncommon on the coast. 



Idotea em a rg in at a. Notched Idotea. — Body oval, elon- 

 gated. Tail truncated, notched. Antennae one-third the 

 length of the body. Reddish -yellow or cinereous; sides and 

 end of tail always pale. 



British coast. 



Idotea linearis. Slender-bodied Idotea. — Body elon- 

 gated, linear ; tail somewhat contracted at the base, with 

 the end dilated, truncated, notched, and with a tooth at 

 each side; blackish brown-above, whitish on the sides. 

 Outer antennas of the length of the body; the third joint 

 longer than the fourth. 



South coast of England ; Ilfracombe. 



Idotea acuminata. — Body of an oblong oval shape ; tail 

 rather sharply keeled down the middle ; the keel produced 

 into a point ; colour, yellowish or reddish, with three longi- 

 tudinal rows of dusky spots. 



Coast of Devon. 



Idotea appendiculata. (Plate XII. fig. 3.) — Body very 

 narrow, and deeply toothed on the sides. Abdomen Ian- 



