Amathillopsis 385 



odIv hind lobe acute. Pleon segments 1-8, postero-lateral corners acutely 

 producert, less in 3*^ thaii in 1^* and 2'^ Eyes yellowisli white, very small, 

 oval, prominent, adjacent to a cavity in the lateral corners of liead. Antenna 1. 

 joints 1 and 2 long, subequal, 3^ about ^^ as long as 2^, flagellura rather longer 

 ithan peduncle, with a great number of very short joints, accessory flagelluni 

 spine-like, 2^ Joint minute. Antenna 2 rather shorter and raore sleuder, 

 basal joints short and stout, ultimate Joint of peduncle shorter than penultimate, 

 flagelluni rather longer than peduncle and, as in antenna 1. calceoliferous. 

 Mandible. 3<i Joint of palp very little shorter than 2^. Maxiila 1, outer 

 plate has 12 spines (Heller; but 11?). Maxiila 2. inner plate with setae 

 on inner raargin. Maxillipeds, outer plates with short spine-teeth on inner 

 margin, continued in longer forms round the apical margin. Gnathopod 1. 

 5^^ Joint narrow proximally, then much widened, wider than the oval sub- 

 fusiform 6^^. both setose on hind margin, finger long, curved. Gnathopod 2 

 with 5*^ Joint wider and rather longer, its distal lobe more rounded, Q^^ Joint 

 slightly longer than in gnathopod 1. but scarcely dütering. Peraeopods 3 — 5. 

 2^ Joint scarcely (in peraeopod 5 a little more) expanded, sharply carinate 

 liehind and produced into a small distal tooth, peraeopod 4 shorter than 3^, 

 and 5*^ shorter than 4*'\ Uropods 1 — 3. peduncle and rami with sharp margins. 

 outer ramus shorter than inner, especially in uropod 2. üropod 3, rami 

 nearly equal to one another and to peduncle. Telson much shorter than 

 peduncle of uropod 3, a little hollowed on surface, rather longer than 

 broad, apically a little widened and emarginate between the rounded corners. 

 Oolour sti-aw-yellow, mouth-parts and front legs vivid red. L. reaching 57 mm 

 from rosti'um to end of uropod 3; (antenna 1: 43 mm). 



Arctic Ocean (Spitzberg-en. Franz Josef Land); North- Atlantic (lat. 63" — 76*>N.). 

 Depth 240—1408 m. 



2. A. aflßnis Miers 1881 A. a., Miers in: Ann. nat. Hist., ser. 5 v.7 p. 48 t. 7 

 f. 3— 5 I 1888 Ä. a., T. Stebbing in: ßep.Yoy. (^hallenger, «.29 p. 865 | 1893 Amathüla 

 spinigera (part.)?, A. Della Valle in: F. Fl. Neapel, ü. 20 p. 684. 



Agreeing in raany respects with A. spinigera. Side-plates not so 

 distinctly emarginate, 4*^' rauch more developed. Antenna 1. 3* Joint relatively 

 shorter than in A. spinigera, flagellum very long and slender, accessory flagellum 

 very minute. Antenna 2 little more than half as long as antenna 1. Gnathopods 



1 and 2 slender and feeble, 5*^* Joint gradually widening to the distal end, 

 which forms no lobe, 6*^ Joint as long and wide, oblong, slightly widened 

 at the palm, which is much shorter than lünd margin, finger short in 

 propoi*tion. Gnathopod 2 rather the longei*. In all the legs 2*^ Joint oblong 

 oval, much more expanded than in A. spinigera. Telson not distally widened. 



Arctic Ocean (Franz Josef Land). "" 



3. A. australis Stebb. 1883 A. a., T. Stebbing in: Ann. nat. Hist., ser. 5 v. 11 

 p.205 ; 1888 A. a., T. Stebbing in: ßep. Voy. Challenger, f. 29 p. 860 t. 65 | 1893 Ama- 

 thüla spinigera (part.), A. Della Valle in: F. Fl. Neapel, 17.20 p. 684. 



Peraeon broad, pleon compressed. Carina indicated on head, peraeon 

 Segments 1 — 4, pleon segments 4 — 6; on peraeon segments 5 — 7 and pleon 

 Segments 1 — 3, prolonged into acute processes, successively larger. Head, 

 rostrum small, deflexed, not projecting so far as the lateral corners. Side-plates 

 3 and 4 deeper than the rest, acute at lower fi-ont corner. Pleon segments 



2 and 3, postero-lateral corners acutely produced. Eyes not perceived. 



Das Tierreich. 21. Lief.: T. R. ß. Stebbing, Amphipoda I. 26 



