224 HISTORY OF BRITISH CRUSTACEA. 
gitndinal 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 emarginata. Notched Idotea . — Body oval, elon- 
gated. Tail truncated, notched. Antennae one-third the 
length of the body. Beddish -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, w T hitish on the sides. 
Outer antennae 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. 8.) — Body very 
narrow, and deeply toothed on the sides. Abdomen lan- 
