PORCELLIDIUM. 165 
Genus 31. PorcELiipium, Claus (1860). 
(Thyone, Philippi.) 
Body oval, depressed, in the female 6-, in the male 
7-jointed. Anterior antenna 6-jointed, in the male 
obtuse, knotted, and adapted for clasping; poste- 
rior 4-jointed, secondary branch of moderate size, 
1-jointed, attached to apex of second joint. Man- 
dible-palp large, forming an irregularly shaped, oblong 
lamina, beset with numerous stout ciliated filaments. 
Maxilla composed of a toothed masticatory branch, 
with a complex, 4-digitate palp. Anterior foot-jaw 
not forming a prehensile hand, divided at the apex into 
short digits, which bear slender, terminal, claw-like 
setz; posterior foot-jaw 3-jointed, elongated, simple, 
with two small, crooked, apical claws, and a laminar 
appendage. Outer branch of first pair of feet short, 
3-jointed ; inner branch composed of one excessively 
broad triangular joint, which is clawed at the apex, 
claws bearing delicate laminar expansions. Second, 
third, and fourth pairs with both branches 3-jointed, 
branches subequal, except in the second pair, which 
has the outer branch very short; fifth pair laminar, 
subtriangular ; caudal segments lamellar. 
