52 



Aiubasia, Ichnopus 



2. A. pulehra (H.J.Hansen) 1887 Tryphosa p., H. .I.Hausen in: Viel. Meddel., 

 ser. 4 r. 9 p. 78 t. 2 f. 6— 6e | 1893 Ichnojms nugax (part.), A. DollaValle in: F.Fl. , 

 Neapel, v. 20 p. 804. 



Head. lateral angles little produced, almost quadratc. Pleon segment 3 

 as iu A. danielssenii, segment 4 not carinate. Jlyes subreniform, veiT deep, 

 rather narrow, yellowisli (red in life). Antenna 1, flagellum with many joints, 

 accessoiy flagellum with 8 joints. x\utenna 2, ultimate Joint of peduncle longer 

 tlian penultimate, flagellum with many joints. Both antennae in ö have the 

 flagella more elongate than in q ; that of antonna 2 is very long, üppei- 

 lip (epistomo?) with prominent, upturned. bluntly pointed process. Mouth- 

 organs not described. Gnathopod 1, 2'^ Joint not much dilated. Gnathopod 2 

 .subchelate. Peraeopods, 4*^^ Joint little expanded. üropod 8. rarai equal in 

 length. L. 15 mm. 



Arctic Ocean and North-Atlantic (West-Greenland). Depth 28- 188 ni. 



31. Gen. Ichnopus A. Costa 



1853 Ichnopus (Sp. un.: I. taurus), A. (>osta in: ßend. Soc. iJorbon.. n. ser. v.2 

 169 ' 1857 L, A. Costa in: Mem. Acc. Xapoli, r.l p. 188 ; 1890 J., G. O. Sars. Crust. 



Nonvay, v.l p. 39 ; 1893 I. (part.). A. Delhi Valle 

 in: F. Fl. Neapel, i\ 20 p. 800. 



Body rather slender and compressed. 

 Flagella of antennae 1 and 2 with numerous 

 Short joints, those of antenna 2 elongate in 

 adult ö. Upper lip slightly projecting above, 

 a small incision between it and the epistome. 

 Lower lip with narrow front lobes, the 

 mandibular processes slender, very divergent. 

 Mandible, cutting edge broad,. simple, molar 

 weak, palp large, central. Maxilla 1, inner 

 plate small, outer broad, obliquely truncate, 

 spines strong, palp normal. Maxilla 2, plates 

 rather naiTow. Maxillipeds normal, outer plates 

 large, broadly rounded, Gnathopod 1 rather 

 thin, not subchelate, 7*^ Joint aiTaed on 

 concave margin with dense bunch of spinules. 

 Gnathopod 2 elongate, subchelate (Fig. 10). 

 Peraeopods 3—5 successively longer. Bran- 



chial vesicles large, bipinnate with accessory lobes. üropod 3, rami rather 



■large, lanceokte, outer 2-jointed. Telson deeply cleft. 



2 species. 



Synopsis of species: 



Gnathopod 1, finger not expanded at base 1. L spinicornis . p. 52 



Gnathopod 1, finger expanded at base 2. I. tatirus. . . . p. 53 



1. I. spinieo-rnis Boeck 1861 /. «., A. Boeck in: Forh. Skand. Naturf., Mede 8 

 p. 645 I 1890 I. s., G. O. Sars, Crust. Norway, v. 1 p. 40 1. 15 | 1865 Lysianassa s., 

 W. Lilljeborg in: N. Acta Soc. Upsal., ser. 3 v. 6 nr. 1 p. 20 | 1866 Ichnopus calceolatus, 

 Cava. Heller in: Denk. Ak. Wien, v.26ii p.20 t. 2 f. 26—28 | 1871 I. tninutus, A. Boeck 

 in: Forh. Selsk. Christian., 1870 p. 99 \ 1872 I. spinicornis -\- I. m., A. Boeck, Skand. 

 Arkt. Amphip., v.l p. 124 t. 2 f. 3; p. 126 t. 3 f. 7 | 1893 I. taurus (part.), A. Della 

 Valle in: F. Fl. Neapel, v. 20 p.801. 



Head, lateral corners somewhat projecting and angular. Back rounded. 

 i!*ide-plates not very deep. Pleon segment 1 produced below in front 



bi'ancbial 

 vesicle 



-V-- 3« Joint 



G"' Joint 



- pig. 10. I. spinicornis. 

 Öfiathopdd 2. [After G. 0. Sars.] 



