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- 

 tennse. 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 XVIII. 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, PMlippi.f 



Body covered with a large shield formed of four segments. 

 Antennse, two, large, filiform, five-jointed. Feet, four pairs; 

 three with a bifid pinnule, the fourth simple. Tail with a 

 bifid tip, and bearing bristles. 



Hersilia apodieormis. — This curious Crustacean was 



* Wiegmann, Archiv, 1839, 132, taf. iv. f. 12. 

 t Wiegmann, Archiv, 1839, 130, t. iv. f. 9, 10, 11 



