PORCELLIDIUM, 165 



Genus 31. POECELLIDIUM, Glaus (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 

 setas ; 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. 



