Aristias, Ambasia . 51 



o. A. megalops 0. Sars 1895 A. m., G. 0. Sars. Crust. Noiway, v.l p. 67ft 

 t. II f. 1. 



Head, with lateral corners slightly producecl. Pleon segment 3, lateral 

 Corners acutely produced. Eyes very large, oblong oval, Visual elements 

 imperfectly developed, pigment light reddish brown. Antenna 1 in d, peduncle 

 rather long, flagellum 4-jointed, scarcely as long as peduncle, accessoiy 

 flagellum 2-jointed. Antenna 2 in (5', flagellum 4-jointed, half as long as 

 peduncle, Gnathopods I and 2 and peraeopods l — 5 nearly as in A. microps 

 (p. 49). üropod 3, outer ramus considerably longer than inner. Telson as in 

 A. microps, but apices more truncate. Colour light yellowish, L. c? 3 mm. 



Perhaps the (5 of A. microps (p. 49). 

 Trondhjemsfjord. Depth 565 — 753 m. 



30. Gen. Ambasia Boeck 



1871 Amhasia (Sp. un.: A. danielssenii), A. Boeck in: Forh. Selsk. Christian., 

 1870 p. 97 I 1890 A., G. 0. Sars, Crust. Norway, v.l p. 45 | 1893 A., A. Della Valle in: 

 F. Fl. Neapel, v. 20 p. 805. 



Side-plate 1 partly concealed, 3 following large and deep. Antenna 1, 

 1** Joint tumid, 2*^ and 3^ very short, flagellum with 1^* Joint very long, 

 accessory flagellum subequal to peduncle in length. Antenna 2 in o scarcely 

 longer than antenna 1. Epistome projecting in front of upper lip as a large 

 angular plate. Lower lip, mandibular processes narrow, divergent. Mandible 

 streng, cutting edge broad, molar evanescent, palp behind the centre. Maxiila 1 

 with 2 setae on inner plate, a small number of spines on outer, palp nonnal. 

 Maxilla 2, plates nearly equal, apically spined. Maxillipeds, inner plates normal, 

 outer large, elliptical, almost reaching end of palp, in which the 4**» Joint 

 is rudimentary. Gnathopod 1 slender, 6*^ Joint shorter than 5*^1, tapering, 

 not subchelate, finger small. Gnathopod 2 very slender, 6*^ Joint about half 

 length of 5*^ long oval. Peraeopods 1 — 5, 7*** Joint very small. Peraeopods 

 3 — 5, 2*^ Joint well expanded. üropod 3 rather shoi*t, outer ramus with 

 small 2*^ Joint. Telson of moderate size, rather tapeiing, deeply cleft. 



2 species. 



Synopsis of species: 



Üropod 3 with very uuequal rami I.A. danielssenii . . p. 51 



üropod 3 with equal rami 2. A. pulchra . . . . p. 52 



1. A. danielssenii Boeck 1871 A. d., A. Boeck in: Forh. Selsk. Christian., 

 1870 p. 97 1 1872 A. d., A. Boeck, Skand. Arkt. Amphip., v.l p. 121 t. 3 f. 6 | 1890 

 A. danielsseni, G. O. Sars, Crust. Norvvay, v. 1 p. 46 1. 17 f. 1 | 1893 A. d., A. Della 

 Valle. in: F. Fl. Neapel, «7.20 p. 805. 



Q . Head, with lateral corners produced, almost quadrate. Pleon segment 3, 

 postero-lateral angles ending in small upturned tooth, above which the margin 

 is broadly rounded; segment 4 with high compressed triangulär expansion 

 dorsally. Eyes narrow. deep, subsigmoid, Visual Clements imperfect, pigment a 

 beautiful red. Antenna l in 9 , flagellum 7-jointed, accessory flagellum 5-jointed, 

 scarcely longer than 1^* Joint of primary. Antenna 2 in 9 , ultimate Joint of 

 peduncle shorter than penultimate, flagellum 5-jointed. Gnathopod 1, Ü^ Joint 

 rather dilated, shorter than rest of limb. Gnathopod 2 subchelate, tending to 

 chelate. üropod 3, inner ramus much the shorter. Colour dark purplish 

 red in transverse bands of pigment spots. L. 13 mm. — ö not known. 



Arctic Ocean, North-Atlantic, North-Sea and Skagerrak (Norway). 



