Ampelisca 101 



with produeed lobe. Peraeopods 1 and 2, 7^^ Joint considerably longer than 

 5*^ and 6'^'^ corabined. Peraeopod 5, 2^ Joint shorter than rest of leg, the 

 expansion transversely truncate, reacliing end of 3*^ Joint, 4**^ completely 

 overlapping the tiiangular 5^'^ with a setose lobe behind, 6^^ oval, broad, as 

 long nearly as the 3 preceding combined, 7^^ naiTOwly lanceolate about half 

 length of 6*^. üropod 3 with rather broad foliaceous rami, carrying plumose 

 setae ou confronted edges. Telson about twice as long as broad, slightly constricted 

 near base, triangularly tapering distally, here carrying within each outer 

 margin a row of setules; eleft for -/s lengih. Body whitish, pellucid, mottled 

 with dark brown stars, head and front legs speckled with light yellow. L. 7 — 9 

 (I)ella Valle), 12 mm (Sars). ^ 



Arctic Ocean, North- Atlantic, North- Sea and Skag-errak (South- and West-Noi-way, 

 northwards to Lofoteu Isles, British Isles, France); Kattegat; 3Iediterranean. 



3. A. macrocephala Lilj. 1852 A. m., W. Liljeborg in: Öfv. Ak. Förh., t".9 p. 7 [ 

 1891 A. m., ii. 0. Sars, Criist. Norway, v. 1 p. 172 t. 60 f. 1 j 1894 A. m., T. Stebbing 

 in: Bijdr. Dierk., f. 17 p. 17 | 1874 A. eschrichtii (err., non Kroyer 18421), Buchholz in: 

 Zweite D. Nordpolarf., v.2 p. 375 Crust. t. 13 f. 1 | 1898 jt. e. (pari), A. Della Valle in: 

 F. Fl. Neapel, v. 20 p. 475. 



Pleon Segment 3 sinuoüs above acutely prominent postero-lateral angles, 

 Segment 4 with dorsal carina little elevated. Cornea! lenses very small, 

 distinct, lower pair at lower corners of head, pigment somewhat irregulär, 

 bright red. Antenna 1 in 9 reaching end of peduncle of antenna 2, flagellum 

 twice leng-th of peduncle, 12-jointed. Antenna 2 in 9 scarcely more than half 

 lengih of b.ody, ultimate Joint of peduncle shorter than penultimate. Peraeo- 

 pods 1 and 2, 7*^^ Joint subequal to 5*^ and 6*1» combined. Peraeopod 5, 2*^ Joint 

 subequal in length to rest of leg, expansion transversely truncate, descending 

 below 3*^ Joint with its füll breadth instead of in a lobe, 4*^ Joint forming a 

 small setose lobe behind, 5*^ can'ying 3 long plumose setae on the hinder 

 angle, 6*^ equal in length to 4 and 5*^ combined. Uropod 2, outer ramus 

 with long spine near apex. üropod 3 with rami broadly lanceolate. Telson 

 oblong oval, with 4 pairs of dorsal spinules and 1 pair at the blunted tip. 

 Body whitish, pellucid, sides mottled with pinkish and yellowish specks. 

 L. 9 14 mm, ö rather less. 



Arctic Ocean; North-Atlantic, North-Sea and Skagerrak (British Isles, whole 

 Norway); Kattegat. 



4. A. gibba 0. Sars 1882 A. g., G. O. Sars in: Forh. Selsk. Christian., nr. 18 

 p. 107 t. 6 f. 1, la I 1891 A. g., G. 0. Sars, Crust. Norway, v.l p. 171 t. 59 f. 2 | 1893 

 Ä. brevicornis (part.), A. Della Valle in: F. Fl. Neapel, i'. 20 p. 473. 



Pleon Segment 3 bisinuate not very deeply over acute, moderately 

 prominent postero-lateral angles, segment 4 with pronounced dorsal hump at 

 the end. Corneal lenses distinct, lower pair a little behind lower corners 

 of head, pigment well defined, bright red. Antenna 1 in 9 scarcely reaching 

 beyond penultimate Joint of peduncle of antenna 2, 2^ Joint more elongated than 

 in A. brevicornis (p. 100), flagellum with 6 joints, about as long as peduncle; 

 antenna 1 in d not reaching end of peduncle of antenna 2. Antenna 2 in 9 not 

 quite as long as body, very slender, ultimate Joint of peduncle a little shorter 

 than penultimate. Peraeopods 1 and 2, 4**^ Joint narrower than in A. brevicornis, 

 without produeed distal lobe, 7^^ longer than 5*^ and 6*^ combined. Peraeo- 

 pod 0, 2<^ Joint subequal to rest of leg, expansion transversely truncate, charactera 

 of limb as in A. brevicornis, but lobe of 4*'* Joint much smaller with only 



