240 
BRITISH ENTOMOSTRACA. 
Legion III— PJBCILOPODA.* 
P^ecilopoda, Latreille, Cuv. Regne An., iv. 
— Desmarest, Cons. gen. Crust. 
— Leach , Diet. Sc. Nat., xiv, 524. 
— Roux , Crust, de la Mediterr. 
— Baird, Trans. Berw. Nat. Club, ii. 
Thecata, Latreille, Hist. Nat. Crust., iv ; Gen. Crust, et Insect., ii. 
— Leach, Edin. Encyclop., art. Crustaceology. 
Branchiopodes parasites, Lamarck, An. s. Yert., edit. 2d, v. 200. 
Crtjstaces suceurs {pars), M. Bdwards , Hist. Nat. Crust., iii. 
Parasita, Burmeister , Beit, zur Naturg. der Bankenfussen, p. 54. 
Cormostomata, Dana, Proc. Am. Acad. Arts and Sc., 1849, p. 58. 
Character . — Month not possessed of organs fitted for 
mastication, having instead an apparatus adapted for 
sucking. Feet, partly formed for walking or prehension, 
and part branchiferous, and fitted for swimming. Body, 
in the greater number, inclosed almost totally within a 
buckler, consisting generally of one piece, occasionally of 
two. Parasitical upon fishes, &c. 
Order SIPHONOSTOMA.f 
Siphonostoma, Latreille, Cuv. Regne Anim., iv. 
— M. Bdwards, Hist. Nat. Crust., iii. 
— Roux, Crust, de la Mediterr. 
— Baird, Trans. Berw. Nat. Club, ii. 
Pneumonura, Latreille, Hist. Nat. Crust., iv ; Gen. Crust, et Ins., ii. 
— Leach, Edin. Encyclop., art. Crustaceology. 
Caligacea, Dana, Proc. Am. Acad. Arts and Sc., 1849, p. 53. 
Character . — Mouth furnished with a siphon, which 
possesses styliform mandibles. Thorax composed of 
several distinct rings, and having three or four pairs of 
feet. Poot-jaws well developed. 
M. Edwards divides the order Siphonostoma into two 
families, the Peltocephales, and the Pachycephales. 
The Peltocephales are distinguished by their having 
* Erom 7roua\oc, various ; and novg, foot, 
f Prom (TKpcjv, a tube ; and aropa, a mouth. 
