Ampelisca 105 



antenna 2, 2* Joint not quite twice as long as 1^*, flagellum with 20 joints, more 

 than twice as long as peduncle; ultimate and penultimate joints of antenna 2 

 equal. Peraeopods 1 and 2, 7*^ Joint shorter than 5*^ and 6^^ combined. Peraeo- 

 pod 5, 2^ Joint longer than rest of leg, expansion broadly rounded, reaching 

 end of 3*^ Joint, which is longer than 4^^; 6*^ fuUy as long as 4*^ and 5*^ 

 combined, itself short and broad; 7*^ not much shorter than 6*^. üropod 3 

 with broad rami. Telson having only a spinule at each apex. Colour deep 

 red (Costa) or pearl-grey, pellucid with a slight tendency on the appendages 

 to violet (Della Valle). L. 6 mm. 



Mediterranean. Among algae. 



12. A. arablyops 0. Sars 1891 A. a., G. O. Sars, Crust. Norway, v. 1 p. 180 

 t.63 f.l i 1893 A. aequicornis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 907, 917. 



Side-plate 1 not concealing base of antenna 2, 4*^ having bind and 

 lower margins defined by an obtuse angle. Pleon segment 3 with postero- 

 lateral angies slightly produced, 4*^ with carina ending in a prominent 

 blunted angle. Corneal leuses absent, but patches of reddish pigment present 

 at the ocular positions. Antenna 1 in 9 not much shorter than antenna 2, 

 peduncle reaching beyond penultimate Joint of peduncle of antenna 2, 2** Joint 

 more than twice as long as 1^*, flagellum with 25 joints, twice length of peduncle; 

 antenna 2 not as long as hodj, ultimate Joint of peduncle louger than penultimate. 

 Gnathopod 1, 6*'^ Joint a little shorter than 5*^. Peraeopods 1 and 2, 7*^ Joint 

 subequal to ö*'^ and 6^^ combined. Peraeopods 3 and 4 comparatively elongate, 

 slender. Peraeopod 5, 2*^ Joint considerably longer than rest of leg, expansion 

 obliquely truncate, reaching to end of 3^ Joint, which is longer than the 4*^, 

 6*^ scarcely as long as 4*^ and 5**^ combined, 7*^ lanceolate, about half 

 length of 6*^. üropod 3 broad, foliaceous, with a few scattered setae. 

 Telson oblong oval, with 2 pairs of dorsal spinules and a pair at the 

 unemarginate apices. Highly pellucid, nearly colourless. L 9 8 mm. 



Christiania^ord and Trondhjemsfjord. Depth 188 — 282 m. 



13. A. pusilla O. Sars 1891 A. p., ö. 0. Sars, Crust. Norway, vA p. 181 t.63 

 f. 2 I 1893 A. aequicornis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 907, 917. 



Closely approaching A. rubella (p. 104). Front of head obliquely 

 emarginate, lower corner little projecting. Side-plate 1 not concealing base 

 of antenna 2. Pleon segment 3, lower bind corners quadrate, 4*^^ scarcely 

 carinate in d, more distinctly and with deep anterior saddle-shaped depression 

 in ö. Corneal lenses absent, but patches of pigment representing the eyes. 

 Antennae 1 and 2 in 9 subequal, little more than half lengih of body ; peduncle of 

 antenna 1 reaching beyond penultimate Joint of peduncle of antenna 2, 2*^ Joint 

 twice as long as P*; antenna 2, ultimate Joint of peduncle louger than penultimate. 

 Gnathopod 1, 6*^ Joint fully as long as 5*^. Peraeopods_l — 4 as in A. amblyops. 

 Peraeopod 5, 2*^ Joint little longer than rest of leg, expansion broad, obtusely 

 ti'uncated in 9, narrower and more obliquely truncated in d, reaching 

 below the 3*^ Joint, which is longer than the 4*^; 6^^ longer than 4*^ and 5**^ 

 combined, 7**" more than half the length of the 6*^^. üropod 3, rami not 

 very broad, slightly armed. Telson without dorsal spinules. Body whitish^ 

 pellucid, with a faint rosy tinge on front of body and side-plate 1. L. 9 

 scarcely more than 5 mm. 



North -Sea, Skagerrak, North - Atlantic and Ai'ctic Ocean (South- and West- 

 Norway, and northwards to Selsövig exactly at the polar circle). Depth 188 — ^376 m, 

 muddy ground. 



