Eusirus, Busiropsis 343 



Body rather slender, peraeon segment 6 a little thickened and rouuded, 

 Segment 7 and pleon Segments 1 and 2 produced into a prominent dorsal 

 tooth, these 3 and 2 foUowing segments carinate. Side-plate 1 produced 

 subacutely in front. Pleon segment 3, postero-lateral corners quadrate, above 

 the acute point fiuely seiTate on lateral margin. Antenna 1 long, 1^* Joint as 

 long as 2*^, flagellura more than twice as long as peduncle, in appearance serrate 

 below, by distal widening of the proximal joiuts, accessory flagellum spine- 

 like, Antenna 2 scarcely half as long, much more slender, ultimate Joint of 

 peduncle in 1 specimen considerably longer than penultimate, only a little 

 in a smaller specimen. Gnathopods 1 and 2 long, slender, 6'^ Joint trans- 

 versely oblong ovate. Teraeopods 1 — 5 exti'emely slender and elongate. 

 Peraeopods 1 and 2, 4^^ Joint not nearly twice as long as 5*^ Peraeo- 

 pods 3 — 5, 2^ Joint narrowly oval, distally narrowed, 4*'^ shorter than ö***, 

 o^^ much shorter than G^^, which is 2'/, — 3 times as long as 2^, finger 

 small, straight. Uropods 1 — 3 long, but strong. Telsou narrow, tapering, 

 cleft very short, widely separating the acute apices. Colour light rose-red. 

 L. 9 53 mm. 



Kara Sea. Depth 172—176 m. 



2. Gen. Eusiropsis Stebb. 



1897 Eusiropsis (Sp. un.: E. riisei), T. Stebbing in: Tr. Linn. Soc. London, 

 ser. 2 V. 7 p. 39. 



Body (Fig. 80 p. 344) without dorsal projections. Head rostrate. Side- 

 plates shallow. l^leon segment 3, postero-lateral corners not produced, lateral 

 margin not serrate. Antenna 1 the shorter, accessory flagellum minute, 

 1-jointed. Antenna 2, ultimate Joint of peduncle in d elongate. Mouth- 

 parts nearly as in Eusirus (p. 338), but maudible with molar feeble, maxilla 1, 

 inner plate unarmed, outer with 10 spines, 2^ Joint of palp naiTower and 

 scarcely longer than 1^*. Gnathopods 1 and 2 as in Eusirus, but bind lobe 

 of 5^^ Joint almost obsolete. Peraeopods 1 and 2 slender, finger ending 

 obtusely and tipped with long setae. Peraeopods 3 — 5 slender, elongate, 

 finger straight, acute, armed like the preceding joints with long setae. 

 Branchial vesicles with accessory lobes. üropod 3, rami lanceolate, spinulose, 

 in ö very plumose (Fig. 81 p. 344). Telson narrow, apically cleft. 



1 species. 



1. E. riisei Stebb. 1897 E. r., (nom. sp. Lütken in MS.) T. Stebbing in: Tr. 

 Linn. Soc. London, ser. 2 u 7 p. 39 t. 13, 14. 



Peraeon segments 2, 3 aud 4 shorter than the others, pleon segments 1 — 3 

 large. Head, rostrum triangulär, longer than broad. Side-plates 1 and 2 

 very shallow, 2*^ distally naiTowed, 3*^ securiform, ~ front corner rouuded, 

 hinder acutely produced, 4**i nearly transversely oblong, slightly emarginate, 

 5^^ and 6*^^ with bind lobe produced. Pleon segments 1 — 3, postero-lateral 

 corners rounded (Fig. 80). Eyes wanting. Antenna 1 in d, 1^* Joint stout, 

 with tufts of setules below, 2^ a little shorter, calceoliferous, 3"^ short, flagellum 

 rather stout. with at least 30 joints, calceoliferous. Antenna 2, penultimate 

 Joint of pedimcle with tufts of setules above, ultimate Joint much longer, 

 longer than peduncle of antenna 1, calceoliferous, flagellum longer than peduncle, 

 with 42 joints, 27 rather stout, with calceoli, rest more slender, with sensory 

 filaments. Upper lip apically rounded, Lower lip. inner lobes sraall. Mandible 

 with 5 or 6 small spines in spine-row. Maxilla 2, inner plate rather broader 



