256 



ßathymedon 



Synopsis of species: 



/ Gnathopod 2, 5tli Joint well expanded distally . . 1. B. obtusifrons . p. 25H 

 ) Gnathopod 2, 5th Joint scarcely at all expanded — 2. 



J Gnathopod 2, 5tli Joint much shorter than 6th . . 2. B. saussurei . . p. 256 

 \ Gnathopod 2, 5tli Joint longer than Hth — 3, 



j Eyes represented by white pigment 3. B. longimanus . p. 257 



\ Eyes entirely wauting 4. B. aeutifrons . . p. 257 



1. B. obtusifrons (H. J. Hansen) ? 1883 Halimedon sayssiirei (err., non A. Boeck 

 1871?), J.S.Schneiderin: Tromse Mus. Aarsh., t-.6 p.35 t.2 f. 13 | 1887 H. obtusifrons, 

 H.J.Hansen in: Vid. Meddel, ser. 4 u9 p. 116 t. 5 f. 1-le i 1893 H. o., A. Della 

 Valle in: F. Fl. Neapel, tt20 p. 536 t. 58 f. 30— 32 | 1892 Bathymedon o., G. O. Sars, 

 Orust. Norway, v. 1 p. 386 t. 118 f. 2. 



Body tumid anteriorly. Rostrum very sliort aud blunt. Side-plate 1 

 expauded. Eyes imperfectly developed, rounded, light red, dorsal behind rostrum. 

 Aiitenna 1 in o a little longer than peduncle of antenna 2, 1^^ Joint louger than 2*^, 

 flagellum louger than peduncle. Antenna 2, ultimate and penultiraate joints 

 of peduncle subequal, together as long as flagellum. Divergent setae on 

 apices of joints of peduncle in antennae 1 and 2. Upper lip, 

 sides obtusely angled. Mandible, 2*^ Joint of palp straight. 

 /y^\ Maxillipeds, outer plates reachiug end of palp's 2^ Joint. 



- 2d johlt Gnathopod 1, o^^^ Joint not longer than 6*'', distally expanded 

 into a much projecting narrow lobe, 6*** rather broad at 

 pretty well defined palm. Gnathopod 2 much longer than 

 gnathopod 1, 5*^' Joint similarly produced, ö*'^ long oval, 

 palm twice as long as bind margin with very long palmar 

 spine, finger very long, curved, serrate within. Peraeo- 

 pods 1 — 4 strongly built, setose, finger lanceolate, short. 

 Peraeopod 5, 5^1' Joint rather shorter than 4^^' or 6*K 

 üropod 3, rami narrowly lanceolate, spinuliferous, nearly 

 twice length of peduncle. Telson rather longer than broad, 

 narrowed distally, apical margin truncate. Colour whitish 

 tinged with yellowish; ova orange-coloured. L. 9 5 mm. 



Arctic ücean (Greenland ; Tromsö,Varangerfjord, depth 188 m). 



2 B. saussurei (Boeck) 1871 Halimedon s., A. Boeck in: 

 Forh. Selsk. Christian., 1870 p. 170 ' 1876 H. s., A. Boeck, Skand. 

 Axkt. Amphip., v.2 p. 283 t. 15 f . 1 | 1893 H. s., A. Della Valle 

 in: F. Fl. Neapel, u20 p.535 t. 58 f. 28. 29 | 1892 Bathymedon s., 

 G. 0. Sars, Crust. Norway. v. 1 p. 335 1. 118 f. 1. 



Body slender. Rostrum acute, reaching a little 

 7'" Joint beyond middle of 1^* Joint of antenna 1. Side-plate 1 distally 

 expanded, 5th broad. Eyes represented by irregulär whitish 

 pigment not extending beyond the head. Antenna l in Q , 

 2*1 Joint cousiderably longer than 1***, flagellum as long as 

 peduncle, 14-jointed. Antenna 2 in Q not longer than an- 

 tenna 1, ultimate and penultimate joints of peduncle nearly 

 equal, together as long as flagellum. Gnathopod 1, 5*^ Joint 

 narrowly produced a little forwards, 6^^' Joint subequal to 5*'*, 

 oblong oval, palm subequal to bind margin. Gnathopod 2 

 slender and feeble, 6^** Joint with very slight process, 6^^ much 

 longer than 5*^^, almost linear, palm short and ill-defined. 

 Peraeopods 1 and 2, finger long and slender. Peraeopod 3 much shorter than 

 peraeopod 4, finger as long as 6*'^ Joint. Peraeopod 4, G^^» Joint much longer 



Fig. 64. 



B. saussurei. 

 Peraeopod 6. 



[After 

 G. 0. Sars.] 



