216 Iphimedia 



7'^^strongly. Pleoii segments 1 — 3 with rudimentary dorsal cariua. Head,i'ostrum . 

 long, nearly reaching apex of 1^*^ Joint of antenua 1, lateral angles acutely 

 bidentate. Side-plates 1 — 4 as in I. obesa (p. 214), 5*^^ — yth ^j^jj ^ strong backward 

 pointing acute process. Pleon segments 1 — :J, postero-lateral angles strongly 

 Outer piate ^^^ acutely produccd, each also witb an 



, acute Upper tootb, that ou segment 3 beut 



upward, serrulate below, segment 6 acutely 

 produced on each side of the telson. Eyes small, 

 oval. Antenna 1. P* Joint longer thau 2^ 

 and 3<^ combiued, apically produced to a long 

 _^ acute tootb and a shorter bifid one, 2*^^ also 

 i'^jomt '"":^^|^"'^ 1 (V^ produced to a bitid tootb, flagellum longer 



than peduncle, about 20-jointed, Antenna 2, 

 penultimate Joint of peduncle with short apical 

 teeth, rather longer than ultimate, flagellum 

 longer than peduncle, 35-jointed. Upper 

 lip distally uarrowed, truncate. Maudible, 

 Fig. 66. I. pacifica. deutation of cutting apex rather distiuct, 



Maxüiipeds. accessory plate on left mandible strap-shaped, 



distinct, its preseuce on right indistinct and 

 doubtful, molar ou left feeble. distinct. on right without perceptible denti- 

 culation, palp with 1^* Joint rather long, yet not as long as 3*^. Maxiila 1, 

 inner plate with 7 or 8 setae, outer with 11 spines, 1^^ Joint of palp more than ^2 

 as long as 2^\ Maxillipeds (Fig. 55), l^t joint of palp not as long as 2^ and 

 3*^ combined, finger wanting. Gnathopod 1, 5*^^ Joint slightly longer than 6*^, 

 both very narrow, chela very small, beset with setae, finger with hooked 

 apex and 2 retroverted teeth on inner margin. Gnathopod 2 rather stouter, 

 o'^^ and 6^'> joints subequal, 6*'^ setose, chela rainute. Peraeopods 3 — 5, 

 2»^ Joint with sinuous strongly seiTate bind margin, lower margin also serrate, 

 meeting in sharp tooth, sti'ongest in peraeopod 5, 4*^ Joint very decurrent. 

 Uropod 3, peduncle short, with 3 acute distal processes, one of the rami 

 long, the other at present unknown. Telson concave above, oblong, distal 

 border with small emargiuation at centre, lateral apices acutely produced. 

 L, about 8 mm. 



Southern Inciian Ocean (Heard Island, depth 273 m; Kerguelen Island, depth 

 231 m). 



4. I. nodosa Dana 1852 Amphitoe n., I. n., Acanthosoma n., J.D.Dana in: 

 P. Anier. Ac, v.2 p.217 j 1853 & 55 I.n., J.D.Dana in: U. S. expl. Bxp.. al3ii ]).928; 

 t. 63 f. 3a, b I 1893 I. n., A. Della Valle in: F. Fl. Neapel, v. 20 p. 583 t. 58 f. 89, 90. 



Integument crustaceous. peraeon segments 4 — 7 each with a pair of 

 dorsal teeth to the bind margin, small, tubercular on segment 4, successively 

 larger on foUowing segments, with a subsidiary tooth at each side; there 

 is also a little above the side-plates a lateral cariua, forming a backward 

 produced tooth to each of these segments. Pleon segments 1 — 3 have also 

 the pair of dorsal teeth, very large, upturned at tip on segment 3, accompanied 

 by accessory tooth on segments 1 and 2, in all 3 preceded by a large dorsal 

 central upstanding tooth or process, segment 4 lias a little medio-dorsal 

 triangulär hump. Head, rostrum produced to end of 1^* Joint of antenua 1, 

 lateral corners produced not quite so far, with apical notch. Side-plates 1 and 2 

 narrowly oblong, 3^ deeper, similar, 4*^^ axe-like, 5*^ — 7**^ each with backward 

 pointing tooth. Pleon segments 1 — 3, each with Ir.terr.l tooth, rathor upward 



