Eurythenes, Tmetonyx 73 



Body massive. Head, lateral angies little produced. Side-plates not 

 veiy deep, 1*** very small, rounded, not covering the head or the protruding 

 moiith-organs, 5*^' mucli broader than deep. Antenna 1, peduncle not very 

 stout, flagellum with raany sliort joints, accessory flagellum well developed. 

 Antenna 2 in o much longer than antenna 1, ultimate Joint of peduncle longer 

 than penultimate, flagellum many-jointed. Epistome not defined by an 

 incision from upper lip, projecting broadly rounded in front of mouth- 

 organs. Lower lip with front lobes apically emarginate. Mandible broad, 

 molar large and prominent, palp not veiy long, affixed a little in ft-ont of 

 molar. Maxiila 1, inner plate canying many setae, outer with the usual 

 11 spines on oblique apex, palp very narrow, apical spiues few. Maxiila 2, 

 inner plate much shorter than outer, both with many setae along inner 

 margin. Maxillipeds normal, the large outer plates not reaching beyond 

 2'^ Joint of the large setose palp, their inner margin furnished with small 

 nodular teeth. Gnathopod 1 sti'ong, subchelate, 6**^ Joint rather longer than 

 5^^\ almost oblong, a little tapering, palm small, slightly excavate. Gnatho- 

 pod 2 very slender, subchelate, fi^^ Joint much more than half length of 

 S^h nearly linear, not produced to form a chela with the minute finger. 

 Peraeopods 3 — 5 rather shoii and stout, 2^ Joint moderately large, 4*^ some- 

 what expanded and produced. Uropod 3 projecting beyond uropods l and 2, 

 rami foliaceous, setose, inner ramus as long as basal Joint of outer. Telson 

 long, free from spinules, sharply tapering, cleft deep, not dehiscent. 



1 species. 



1. E. gryllus (Lclit.) 1822 Gammarus g., (H. Lichtenstein in:) Mandt, Obsen^. 

 öroenl., p. 34 I 1866 Lysianassa g., Goes in: Öfv. Ak. Förh., r.22 p.517 t.36 f. 1 | 1884 

 Eurythenes g.. S.I.Smith in: Amer. .1. Sei., ser. 3 r. 28 p. 54 | 1891 Euryporeia g., 

 G. 0. Sars, Crust. Norway, v. 1 p. 86 t. 30 | 1893 E. g., A. Della Valle in: F. Fl. Neapel, 

 V. 20 p. 848 t. 60 f. 58 | 1848 Lysianassa magellanica, H. Milne Edwards in: Ann. Sei. 

 nat., ser. 3 v.9 p. 398 | 1865 Eurytenes mageUanicus, W. Lilljeborg in: N. Acta Soc. 

 Upsal., ser. 3 ». 6 nr. 1 p. 11 t. 1—3 f. 1—22. 



Back broadly rounded (Sars), last segment of peraeon and P* — 5*'^of pleon 

 with a low longitudinal ridge (Lilljeborg), Segments 4 — 7 of peraeon and 1 — 4 of 

 pleon carinate. Pleon segment 3, postero-lateral angies rounded, segments 3 

 and 4 with dorsal depression. Eyes veiy large, irregularly flask-shaped, light 

 orange. Antenna 1, 1^* Joint not very long, flagellum with 30 joints, 1^* large, 

 accessory flagellum with 10 joints, P* the largest. Antenna 2 twice as long as 

 antenna 1, flagellum slender, setose, 50-jointed. Gnathopod 2 twice as long 

 as gnathopod 1. Telson nearly reaching apex of uropod 3. Colour rosy 

 with yellowish finge, margin of legs vermilion. L. reaching 90 mm. 



• Arctic Ocean and North-Atlantic (Finmark, North East of America, Bay of 



Eiscay, Azores), tropical Atlantic (lat. 4** S., long. 18<> W.), South- Atlantic (Cape Hörn). 

 From Procellaria glacialis L., from stomachs of sharks, and fished up from great depths. 



45. Gen. Tmetonyx Stebb.*) 



1891 Hoplonyx (non Jam. Thomson 1858, Coleoptera!), G. 0. Sars, Crust. Xorway, 

 V. 1 p.91 I 1894 H., T. Stebbing in: Bijdr. Dierk., r. 17 p. 9. 



Epistome more or less projecting and rounded in front. Antennae 1 and 2 

 in ö with small calceoli. Mandible, molar large, obliquely ti'uncate, palp affixed 

 over it, 2*^ and 3^ joints subequal. Maxiila 1, 2 setae on inner plate. 



*) Nom. nov. ; T|LiriTÖ^, shaped by cutting, övuE, nail. — The name Hoplonyx 

 is preoccupied (1858, James Thomson in: Arch. ent., f. 2 p. 98). 



