68 



Cumacea: 9. Leuconidae, 1. Leucon 



plumose setae. Colour whitish. L. 9 12 mm, d 10 mm. The young d 

 is much like the 9 . 



Norway, depth 56 — 188m; Kattegatt; Heligoland; British Isles, depth 82 — 108 m; 

 (tuU" of St. Lawrence, depths 91 and 128 m; Spitzbergen, 175 — 210 m; Kara Sea; 

 Greenland, 4 — 565 m; Afognak Bay, Alaska, 22 — 31 m; Coal Harbor, Unga, 11 — 14 m; 

 Mare Murmanicum, 90 m. 



7. L. antareticus Zimmer 1907 L.antarctica, Zimmer in: Zool, Auz., v.'il p. 227. 



9 juv. Slender. Pseudorostral lobes much extended to apex in dorsal 

 view very acute; antero-lateral corners preceded by a broad deep sinus. 

 Carapace with denticulate carina from front to hind margin, but last 2 denticles 

 separated by a smooth space from the rest. An eyelobe obscurely present, 

 the frontal lobe having a pair of lateral denticles in front and a sublateral 

 pair to the rear, the pseudorostral lobes also having a pair close to the front 

 pair of the frontal lobe. Antenna 1, the 1 -jointed accessory flagellum as long as 

 1^* joint of principal flagellum. Peduncle of uropods shorter than the rami, 

 exopod slightly shorter than endopod, which has on 

 medial margin of 1***^ joint about 9 spines, 3 on 2"^^ 

 joint and an apical spine. Colour yellowish white. 

 L. about 13-3 mm. d juv. differing little from 9 juv. 



German Sonth-Pole Expedition, Winter Station (lat. 

 66 2' S., long. 89 *> 38' E.) 



Fig. 36. 

 L.nasica(Kroyer), raaxiUipedi (after Sars). 



Fig. 37. 



L. nathorsti Ohlin. 



8. L. nathorsti Ohlin 1900 L. nasicokles (part.), Zimmer in: Fauna arctica, 

 v.l p. 417 I 1901 L. nathorsti, Ohlin in: Bih. Svenska Ak., u26 nr. 12 p. 41 t.6 f. 9 a— c | 

 1908 L. n., Zimmer in: Ergeb. Tiefsee-Exp., v.8 p. 178 | 1911 L. n., Stappers in: Camp, 

 arct. Orleans, Crust Malac. p. 104. 



Near to L. nasleoides (nr. 3), Init pseudorostral lobes longer and more 

 acuminate, with six teeth to the lateral tnmcation; the antero-lateral corners 

 moderately produced, lower margin behind them serrate for a third of its 

 length. Median carina of carapace with 13 — 15 teeth reaching a little 



