24 PHRONIMID.E. 



GUEKIN M^N., Icon. R. An. Crust. 

 pi. xxv. fig. 4. LUCAS, Expl. dans 

 Algerie, t. v. fig. 5. WHITE, Cat. 

 Mus. Brit. Mus. 1847, p. 50. Pop. 

 Hist. Brit. Crust, p. 208, pi. xi. 

 fig. 4. SPENCE BATE, Ann. Nat. 

 Hist. 2 ser. xix. p. 152. Cat. Amph 

 Brit. Mus. p. 316, pi. L. fig. 1. 



THE head is deeper than long, tapering gradually 

 towards the mouth. The antennae are short, arid 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 



