24, PHRONIMID®. 
GuExIn Mén., Icon. R. An. Crust. 
pl. xxv. fig. 4. Lucas, Expl. dans 
Algérie, t. v. fig. 5. Wurrr, Cat. 
Mus. Brit. Mus. 1847, p. 50. Pop. 
Hist. Brit. Crust. p. 208, pl. xi. 
fig. 4. Spence Bare, Ann. Nat. 
Hist. 2 ser. xix. p. 152. Cat. Amph 
Brit. Mus. p. 316, pl. L. fig. 1. 
Tue head is deeper than long, tapering gradually 
towards the mouth. The antennz are short, and almost 
rudimentary, having but two joints, the basal one short, 
the second about four times as long, furnished with several 
membranous cilia along its distal portion. The upper lip 
is a broad, thin plate, with a deep and narrow notch in 
the middle. The mandibles consist of large and squami- 
form plates, having the cutting margin formed into a 
smooth hoe-like blade. The right blade is furnished with 
a small second articulate plate, and both have the molar 
process developed in the form of a flat plate, perpendicular 
to the cutting margin, and fringed with short cilia. The 
first pair of foot-jaws consist of a basal joint and two 
branches, the one being somewhat lance-shaped and flat, 
having the outer margin smooth, but the inner serrated ; 
the teeth being curved anteriorly and slightly overlapping 
each other. The second branch is hollow, or cup-shaped, 
having the margin evenly pectinated. The second pair of 
foot-jaws also consist of a basal joint and two ciliated 
oval plates, pointed at the tips. The under lip also 
consists of a basal joint, rather longer than wide, termi- 
nated by two lateral pointed lobes, having a double row of 
serratures on the inner margin, and furnished with a third 
central acute inner lobe. The first two pairs of legs 
are very similar, having the infero-anterior margin of 
the wrist anteriorly serrated; and in the first it is a little 
more produced anteriorly than in the second. The hand 
is long, slender, cylindrical, and tapering. The finger is 
