Eusirus 339 



serrate. P]ye8 distinct. Antenna 1, 3"^ joiut short, more or less covered 

 by 2 dentate lobes of 2^ Joint, accessory flagellum a small linear Joint with 

 miuute 2^. Upper lip rounded. Mandible, cutting edge almost undivided, 

 accessory plate dentate, spines of spine-row sraall, 3"^ Joint of palp as long 

 as 1^*^ and 2*^ combined. Maxilla 1, inner plate with 1 or 2 setae, outer at least 

 sometiraes with 1 1 spines, palp not widened distally. Maxilla 2, both plates 

 Short, broad, apically rounded, inner the broader. Maxillipeds, inner plates 

 sometimes partly coalesced, outer of moderate size, fringed with setiform 

 spines, palp robust, finger unguiform. Gnathopods 1 and 2 (Fig. 79), 

 5*^ Joint prolonged in front, behind produced to a naiTow setose lobe, 

 gth yejy large, subquadrate or ti-ansversely elliptical, attached to the ö^'i Joint 

 only by its proximal front corner, palm nearly transverse, defined by a 

 tooth and palmar spines, its edge sharp, minutely setose, tinger long, slender, 

 curved. Peraeopods 1 and 2 generally very slender. Peraeopods 3 — 5 

 long, 2*^ Joint oblong oval or piriform. Uropod 3, rami lanceolate, spinulose. 

 Telson elongate, tapering, cleft or notched. 



8 species. 



l-i 



i: 



Synopsis of species: 



Telson cleft beyond one third of length — 2. 

 felson not cleft beyond one third of length — 4. 



{Peraeopods 1 and 2, 4tli Joint not nearly twice 

 as long as öth 1. E. cuspidatus . . p. 339 

 Peraeopods 1 and 2, 4tli Joint twice as long 

 as 5th — 3. 



j Antenna 1, Ist joint much longer than 2d ... 2. E. propinquus . . p. 340 

 \ Antenna 1, Ist joint not much longer than 2d . 3. E. antarcticus . . p. 340 



Only 2 Segments are dorsally produced into a tooth 4. E. longipes . . . p. 341 

 3 Segments are dorsally produced into a tooth — 5. 



/ Pleon Segment 3 dorsally dentate — 6. 



\ Pleou Segment 3 not dorsally dentate — 7. 



j Telson cleft nearly one third of the length ... 5. E. leptocai'pus . . p. 341 

 ) Telson with minute apicai notch 6. E. biscayensis . . p. 342 



j Peraeopods 3 — 5, 6th joint not twice as long as 2d 7. E. minutus . . . p. 342 

 \ Peraeopods 3 — 5, 6th joint nearly thrice as long as2d 8. E. holmii .... p. 342 



1. E. cuspidatus Kreyer 1845 E. c, Kreyer in: Naturh. Tidsskr., ser. 2 v.l 

 p. 501 t. 7 f. 1 I 1874 E.c, Buchholz in: Zweite D. Nordpolarf., v.2 p. 313 Crust. t. 3 

 f. 2, 2b I 1893 E. c, G. O. Sars, Crust. Norway, vA p.416 t. 146 ) 1893 E. c. (part.), 

 A. Della Valle in: F. Fl. Neapel, ü.20 p.669 t. 18 f. 41—50; t. 59 f. 79-82. 



Body rather robust, carina produced to acute doi'sal tooth in peraeon 

 Segments 6 and 7 and pleon segments 1 and 2; pleon segment 4 partly carinate. 

 Head, rostrum short, obtuse, lateral corners slightly bilobed. Side-plate 1 

 moderately expanded distally, front corner rounded, hinder serrate with 3 

 denticles, as in the rather tapering 2"^ and 3*^. Pleon segment 3, postero- 

 lateral corners evenly rounded, convex lateral margin minutely seiTate. Eye« 

 rather large, oval reniform, red. Antenna 1, 1^* and 2*^ joints subequal, 

 with dentate apicai lobes, flagellum about twice as long as peduncle, with 

 about 50 Short' joints, accessory flagellum very small, scarcely as long as 3^ joint 

 of peduncle. Antenna 2 considerably shorter, ultimate and penultimate joints 

 of peduncle subequal, together fully as long as flagellum. Gnathopods 1 and 

 2 rather robust, lobe of 5*^ joint prominent, 6**^ not much broader than long, 



22* 



