uUrt Haliragoides. Aplieriisa 



ou inner margiu. Telson shorter than peduncle of uropod 3, oval triangulär, 

 tridentate, the central tooth much the largest. Colour brilliant witli red. 

 orange and pure white. L. 10 — 14 mm. 



Arctic Ocean, Xorth-Atlantie and Xorth-Sea (Xorway). Deptli 188 — 564 iii. 



15. Gen. Apherusa A. Walker 



1859 Paramphithoe (part.), ß. M. Bruzelius in: Svenska Ak. Haudl., u. ser. v.'ö 

 nr. 1 p. 68 j 1861 Amphithopsis (part.), A. Eoeck in: Forh. Skand. Xaturf., Mede 8 

 p.661 I 1862 Gossea (Sp. un.: G. microdeutopa) (non L. Agassiz 1862, Coelenterata!), Bäte 

 (& Westwood). Brit. sess.Crust., v. 1 p. 276 1871 Halirages (part.), A. Boeck in: Forh. Selsk. 

 Christian., 1870 j). 194 | 1891 Apherusa, A.O.Walker in: Ann. nat. Hist., ser. 6 v.H 

 p. 83 i 1893 A., G. O. Sars, Crust. Norway, v. 1 ]). 438. 



Head, post-antennal corners more or less produced. Side-plates of 

 moderate size, encreasing in depth to the 4*^. Antenna 1 shorter than 

 antenna 2, without calceoli, no accessory flagellum. Upper lip rounded. 

 Lower lip with small inner lobes. Mandible, molar strong, 3^ Joint of palp 

 shorter than 2*1. Maxilla 1, inner plate with variable number of setae, 

 outer with variable number of spiues. Maxilla 2, inner plate the naiTOwer, 

 fi'inged on inner margin. Maxillipeds, inner plates large as compared with 

 outer, outer fringed on inner margin with spine-teeth or slender spines, palp 

 of moderate size. Gnathopods 1 and 2 not strong or differing much in 

 size. Peraeopods 1 — 5 usuallj rather strongly built. üropod 3, rami usually 

 projecting beyond the others. Telson not large, entire. 



7 species accepted, 3 doubtful. 



Synopsis of accepted species: 



j Back with some segments dentate — 2. 

 \ Back with no segments dentate — 5. 



I Postero-lateral margin of pleon segment 3 smooth . I.A. cirrus . . . p. 304 

 2 I Postero-lateral margin of pleon segment 3 denti- 

 I culate — 3. 



j Peraeon segment 7 dentate .... • 2. A. tridentata . p. 305 



\ Peraeon segment 7 not dentate — 4. 



IHead, post-antennal corners slightly produced; telson 

 tridentate 3. A. bispinosa . p. 305 

 Head, post-antennal corners strongly produced ; telson 

 bidentate 4. A. megalops . j). 306 



_ J Gnathopods 1 and 2, 5th Joint much longer than 6th 5. A. glacialis . . p. 307 

 \ Gnathopods 1 and 2, 5th Joint not longer than 6th — 6. 



J Antenna 1, 3d joint much shorter than 2d 6. A. jurinei. . . p. 307 



\ Antenna 1, 3d joint not much shorter than 2d . . . 7. A georgiana . p. 308 



1. A. cirrus (Bäte) 1862 Pherusa bicuspis (P. cirrus Bäte) (err., non Amphifhoe b. 

 Kröyer 1838!), Bäte & Westwood, Brit. sess. Crust., v. 1 p. 253 f. | 1862 P. cirrus -\- 

 P. b., Bäte, Cat. Amphip. Brit. Mus., p. 143 t. 27 f. 6; p. 144 t. 27 f. 7 | 1871 Halirages 

 borealis, A. Boeck in: Forh. Selsk. Christian., 1870 p. 196 | 1876 H. b., A. Boeck, 

 Skand. Arkt. Amphip., v.2 p.340 t.23 f. 6 1 1893 Apherusa b., G. O. Sars, Crust. Norway, 

 v.l p.441 t. 155 f. 2 j 1895 A. b.?, A. O.Walker in: Ann. nat. Hist., ser. 6 «J.15 p.468 j 

 1893 Acanthozone laeciuscula?, A. DellaValle in: F. Fl. Neapel, i'. 20 p. 619. 



Pleon segments 1 and 2 each produced into a dorsal tooth. Head 

 somewhat produced in front, but not rostrate, lateral and post-antennal 



