74 Tmetonyx 



11 spiiies on the broad obliquely truucate outer, several spine-teeth oii palp. 

 Maxiila 2, plates rather longer than in Anonyx (p. 53). Maxillipeds, outer plates 

 large, oblong oval, reaching end of 2'^ Joint of palp, whicli is not specially 

 robust. Gnathopod 1 slender, 3*^ Joint generally longer than 4*^ 6*ii oblong, 

 palm very oblique, rather indistinctly defined, 7*^ rather long, minutely 

 denticulate, having a secondary tooth on inner raargin and a cap over the 

 apex. Gnathopod 2, 6**^ Joint usually not at all produced beneath the 

 minute iinger. Peraeopods 1, rather elongate, 2^ Joint large. Branchial 

 vesicles usually simple, üropod 3 projecting beyond uropod 2, rami minutely 

 denticulate. Telson oblong, deeply cleft. 



8 species. 



Synopsis of species: 

 f Pleon Segment 3 little or not at all produced — 2. 



1 



\ Pleon Segment 3 acutely produced or upturned — 5. 



( Head, lateral corners rounded — 3. 



) Head. lateral corners not rounded — 4. 



\ Antenna 1, Ist Joint of flagellum not very large 1. T. cicada p. 74 



\ Antenna 1, Ist Joint of flagellum very large . . 2. T. miersi p. 75 



Head, lateral corners acute, much produced; eyes 



bright red, angled 3. T. acutus p. 75 



Head, lateral corners quadrate; eyes light red, 



scarcely angled 4. T. albidus . . . . p. 75 



Side-plate 1 expanded below 5. T. cicadoides . , . p. 75 



Side-plate 1 not expanded below — 6. 



Eyes bright red 6. T. similis p. 76 



Eyes white 7. T. leucophthalmus p. 76 



Eyes wanting 8. T. caeeulus . . . . p. 76 



1. T. cicada (0. Fabr.) 1780 Oniscus c, 0. Fabricius, Fauna Groenl., p. 258 | 

 1888 Anonyx c, T. Stebbing in: Rep.Voy. Challenger, v.2% p. 47, 617 | 1893 A. c. (part.), 

 A. DellaValle in: F. Fl. Neapel, u 20 p. 833 \ 1891 Hoplonyx c, G. 0. Sars, Crust. 

 Norway, v. 1 p. 92 t. 32 f . 2 | 1894 H. c, T. Stebbing in: Bijdr. Dierk., v. 17 p. 9 | 1845 

 Anonyx gulosus, Kreyer in: Naturh. Tidsskr., ser. 2 v.l p. 611 ] 1846 A. g., Kreyer in: 

 Voy. Nord, Crust. t. 14 f. 2a — t | 1866 Lysianassa gulosa, Goes in: Öfv. Ak. Förh., 

 V.22 p. 520 I 1851 Anonyx norvegicus, W. Liljeborg in: Öfv. Ak. Förh., v.S p. 22 | 1861 

 A. bruzelii, A. Boeck in: Forh. Skand. Naturf., Made 8 p. 643. 



Head, lateral angles very slightly projecting, slightly rounded. Side- 

 plate 4 expanded in a narrow obtuse lobe. Pleon segment 3, postero- 

 lateral angles almost quadrate, with very short produced point. Eyes angled*, 

 narrow linear above, lower arm oval, bright red. Antenna 1 in g , flagellum with 

 16 joints, 1^* not very large, accessory flagellum 7-jointed. Antenna 2 in Q , 

 flagellum 28-jointed. Gnathopod 1, 5*^ and 6*^ joints equal in length, palm 

 arcuate, finely serrate, not defined by any trace of angle. Gnathopod 2, 

 6*^ Joint half as long as 5*^. üropod 2 with neither ramus constricted. 

 üropod 3, inner ramus scarcely longer than basal Joint of outer. Telson 

 not quite twice as long as broad, cleft nearly to base, with 2 pairs of 

 dorsal spinules and an apical pair. Colour creamy with tinge of rose and 

 on the back bright apple red; eggs in pouch dark violet. L. 9 18 — 24 mm. 



Arctic Ocean; North- Atlantic, North-Sea and Skagerrak (South- and West- 

 Norway, Bohuslän, North Britaiu, France). 



