308 
HISTORY OF BRITISH CRUSTACEA. 
Gen. 169. PELTIDIUM, Philippi* 
The body covered with a large shield formed of seven seg- 
ments; first segment the largest. Two large, six-jointed an- 
tennae. Legs, six pair ; first pair simple, with a long claw ; 
the second, third, fourth, and fifth pairs with two branches ; 
the sixth pair simple. Tail with the tip bifid, and bearing 
bristles. 
Peltidium purpureum. (Plate XY1II. fig. 4.) — Our 
figure is from an original drawing by Mr. Spence Bate. 
The species was first ascertained to be British by that gen- 
tleman, who took it on the southern coast. 
Gen. 170. HERSILIA, Philippi + 
Body covered with a large shield formed of four segments. 
Antennae, two, large, filiform, five-jointed. Eeet, four pairs; 
three with a bifid pinnule, the fourth simple. Tail with a 
bifid tip, and bearing bristles. 
Hersilia apodiformis.— This curious Crustacean was 
* Wiegmann, Archiv, 1839, 132, taf. iv. f. 12. 
f Wiegmann, Archiv, 1839, 130, t. iv. f. 9, 10, 11 
