Iphimedia. 215 



5^'i and 6^^^ joints subequal, G^'^ setose, veiy slightly expanding to the chela, 

 which is less than ^4 of the whole length, tliumb much stouter than fiiiger. 

 Peraeopods 3 — 5, 2*^ Joint oval quadrangular, the lower hiud angle a little 

 produced only in peraeopod 5, 4^^^ Joint decurrent, üropod 3, rami long, 

 nearly equal. Telson oblong, little tapering, angularly incised between 

 2 acute apices. Colour variable, whitish, striped with rosy pink, or lemon- 

 «oloured, or purplish gTey. L. Q reaching 12 mm, ö less. 



Arctic ücean. North-Atlantic, North-Sea, Skagenak and Kattegat (Scandinavia, 

 Oreat Britain, France, Holland). 



2. I. pulehridentata Stebb. 1883 I. j)-, T. Stebbing in: Ann. nat. Hist., ser. 5 

 i;. 11 p. 208 I 1888 Lp., T. Stebbing in: Rep. Voy. Challenger, v.2d p. 894 t. 72 ] 1893 

 I. p., A. DellaValle in: F. Fl. Neapel, t;.20 p. 583 t. 58 f. 88. 



Peraeon broad rounded, pleon rather compressed, Peraeon segments 6 and 7, 

 pleon Segments 1 and 2, each with 2 large acute backward directed processes, 

 pleon Segment 3 with 1 sucli process, on either side of medio-dorsal line, 

 pleon Segments 1—4 carinate, the carina forming in each a large tooth, 

 with an accessory tooth in segments 2 and 3. Peraeon segments 1 — 7 with 

 postero-lateral angles sharply produced, in 6^^ and 7^^ forming long downward 

 curving processes. Head, rostrum long, acute, downward curving, nearly reaching 

 apex of 1^* Joint of antenna 1, lateral angles produced into 2 sharp processes 

 curving one towards the other. Side-plates 1 — 3 ending below in 2 acute 

 processes, side-plate 2 rather narrower than 1^* or 3'^; side-plate 4 narrow, 

 very acute below, the lower emargination much longer than the upper; 

 side-plate 5 bilobed, hiud lobe produced backward in 2 large processes, 

 side-plate 6 not bilobed, produced into 2 long processes, side-plate 7 into 

 an Upper long and lower short process. Pleon segments 1 and 2, postero-lateral 

 angles acute, little produced, a very large process on the margin above, in 

 pleon Segment 3, the angle -strongiy produced in upcurving tooth with similar 

 one above. Eyes round, rather prominent. Antenna 1, 1^^ Joint with tooth 

 near base and 3 unequal distal teeth, 2'^' Joint with 1 short and 1 very 

 long distal tooth; possibly a 1-jointed accessory flagellum is present. Antenna 2, 

 joints of peduncle dentate, ultimate and penultimate joints equal, flagellum with 

 about 30 joints or more. Upper lip not narrowed, slightly convex. Lower lip, 

 inner edge only a little emarginate. jVIandibles, cutting apex undivided, accessory 

 plate dentate on both mandibles, more strap-like on right, molar not dentate, 

 3^ Joint of palp rather longer than 1^^ Maxiila 1, 10 setae on inner plate, 

 11 spines on outer, 2'^ Joint of palp reaching much beyond outer plate. 

 Maxillipeds, 3 joints ot palp nearly equal, 1^* rather the longest. Gnatho- 

 pods 1 and 2 closely resembling those of T. pacifica. Peraeopods 3—5, 2^ Joint 

 smooth in front, behind cut into various unequal large acute processes, largest 

 on peraeopod 5, 4^^' Joint strongiy and very acutely decurrent. Uropod 3, 

 peduncle short, with 3 unequal apical teeth, rami rather broad lanceolate, 

 unequal. Telson longer than broad, tapering pretty sti-ongly, emarginate 

 more than a quarter the length, between 2 spine-tipped apices. L. 13 mm. 



Southern Indian Ocean (Heard Island). Depth 136 m. 



3. I. pacifica Stebb. 1883 Lp., T. Stebbing in: Ann. nat. Hist., ser. 5 nll 

 p. 207 I 1888 Lp., T. Stebbing in: Rep. Voy. Challenger, u 29 p. 890 t. 71 | 1893 Lp., 

 A. DellaValle in: F. Fl. Neapel, i\20 p. 583 t. 58 f. 89. 



Peraeon segment 7, pleon segments 1 and 2 dorsally produced into 2 sti'ong 

 teeth. All peraeon segments with lower margin produced acutely backward. 



