214 Iphimedia 



3. Geu. Iphimedia H. Rathke 



1843 Iphimedia (Sp. im.: I.ohesa), H. Kathke in: X. Acta Ac. Leop., r. 20i p. 85 

 1888 /., T. Stebbing in: Rep. Voy. Challenger, «.29 p. 889 | 1893 1., G. 0. Sars, Crust. 

 Norvvay, v.l p.376 | 1893 /., A. Della Valle in: F. Fl. Neapel, v.2Q p.582 | 1846 Micro- 

 cheles (Sp. un. : M. armata), Kroyer in : Naturh. Tidsskr., ser. 2 v. 2 p. 58, 66. 



Back broadly rounded, some Segments produced into teeth. Eostrum 

 acute. Side-plates 1 — 3, at apex simply acute or bideutate, 4*'^ with projecting 

 tooth between 2 emarginations. Eyes well developed. Antennae 1 and 2 not 

 greatly differing in length. Upper lip little or not emarginate. Low.er lip 

 having outer lobes incised on iimer margin, thus forming an inner process. 

 which may or may not represent tlie inner lobe. Mandible ratlier broadly 

 tapering to blunt obscurely dentate cutting apex, accessory plate ratlier long, 

 spine-row wanting, molar feeble (or sometimes wanting?), palp ratlier strong. 

 Maxilla 1, inner plate with several setae, outer with (always?) 11 spines, 

 palp 2-jointed, reaching beyond apex of outer plate. Maxilla' 2 and maxillipeds 

 as in Panoploea (p. 211). Gnathopods 1 and 2 very slender, delicately chelate, 

 3"^ Joint not very short; 2*^ Joint in gnathopod 1 sinuous. Peraeopods 3 — 5, 

 2*^ Joint well expanded. Uropod 3, rami narrowly lanceolate. Telson broadly 

 incised at apex. 



4 species accepted, 2 doubtful. 



Synopsis of accepted species: 



( Side-plates 5 — 7 not acutely produced backward 1. I. obesa p. 214 



I Side-plates 5 — 7 acutely produced backward — 2. 



f Side-plates 5 — 7 forming each 2 acute processes 2. I. pulchridentata . j). 215 



) Side-plates 5 — 7 forming each 1 acute process — 3. 



f Of peraeon segments only 7th with a pair of dorsal 



teeth 3. I. pacifica p. 215 



Of peraeon segments 4th — 7th each with a pair 



of dorsal teeth 4. I. nodosa p. 216 



[ 3 



1. I. obesa H. Rathke 1843 J. o., H. Rathke in: N. Acta Ac. Leop., r.20T p.85 

 t. 3 f. 1 A— Q I 1876 I. 0., A. Roeck, Skand. Arkt. Amphip., v. 2 p. 245 t. 18 f. Ild—k 

 1889 I. 0., Hoek in: Tijdschr. Nederl. dierk. Ver., ser. 2 v.2 p. 194 t. 7 f. 6 | 1893 I. o., 

 O. 0. Sars, Crust. Norway, v.l p.377 1. 132 | 1893 I. o. (part.), A. Della Valle in: F.Fl. 

 Neapel, u20 p. 584 t. 58 f. 92 [ 1846 Microcheles armata, Kreyer in: Naturh. Tidsskr., 

 ser. 2 V.2 p. 58 | 1846 M. n., Kreyer in: Voy. Nord, Crust. t. IIb f. 2a — v. 



Peraeon segment 6, pleon segments 1 — 3 dorsaUy produced into 

 2 teeth. Head, rostrum strongly curved, overlapping 1^* Joint of antenna 1. 

 lateral corners deflexed, acute. Side-plates 1 — 3 tapering to acute apex, 5*^^ 

 and 6^'^ with bind lobe the deeper, subtruncate at apex. Pleon segments 2 and 3, 

 postero-lateral angles acute, segment3 having an upper tooth subequal to the corner 

 one. Eyes large, reniforra, dark red, scarlet, or purplish. Antenna 1, 1^* Joint longer 

 than 2*^ and 3*^ combined, forming a large apical tooth. 2^ with small tooth. 

 flagellum nearly thrice as long as peduncle, with about 24 joints, each with fascicle 

 of sensory setae, more strongly developed in ö . Antenna 2 scarcely longer, ulti- 

 mate Joint of.peduncle longer than penultimate, flagellum about twice as long as 

 peduncle. Upper lip distally naiTOwed, slightly emarginate. Mandible, accessory 

 plate distinct on both left and right, molar almost obsolete, palp sturdy, 3'^ Joint 

 curved, much longer than P*. Maxillipeds, P* Joint of palp as long as 2'^ and 3*1 

 combined, finger wanting (Sars) or rudimentary (Boeck). Gnathopod 1 very 

 slender, b^^ Joint rather shorter than 6*^^, chela about ^^ length of 6**^ Joint, 

 thumb not stouter than apically denticulate finger. Gnathopod 2 rather stouter. 



