Ampelisca 107 



Back not carinate, except slightly at pleon segment 4. Head truncate 

 Tiearly transversely, but with upper corner ratber raore projecting than lower. 

 Side-plate 4 with bind and lower margins defined by an obtuse angle. 

 Pleon segment 3, lower bind corners quadrate. Corneal lenses small, distinct, 

 lower pair removed from lower corners of bead, pigraent well defined, reddish. 

 Antenna 1 in 9 very little sborter tban antenua 2, peduncle reacbing beyond 

 penultimate Joint of peduncle of antenna 2, 2*^ Joint twice as long as P*, flagellum 

 24-jointed. niore tban twice as long as peduncle; antenna 2 a little over balf 

 lengtb of body, ultimate Joint of peduncle longer tban penultiraate. Gnatbo- 

 pod 1, 6^^ Joint shoiier tban 5*^; gnathopod 2 much more slender than 

 gnathopod 1. Peraeopods l and 2, 7^^ Joint scarcely equal to 5^^ and 6*^ 

 •combined. Peraeopods 3 and 4 unusually short and robust. Peraeopod 5, 

 2^ Joint longer tban rest of leg, expansion broad, obtusely ti'uncate, not 

 reacbing end of 3<^ Joint, wbich is much longer than the 4*^, 6*^^ shorter 

 than 4*^ and 5*^ combined, 7^^ broadly lanceolate, more tban balf length 

 of 6*^ Uropod 3, rami foliaceous, fringed with spinules. Telson oblong, 

 a little tapering distally, with 2 pairs of dorsal spinules and 1 pair at the 

 blunted apices. L. 9 11 mm. 



North-Sea, Skagerrak and North- Atlantic (South- and West-Norwajv northwards 

 to Lofoten Isles, ßohuslän. British Isles). 



17. A. serraticaudata Chevreux 1888 A. s., A. serraticanäata (laps.), Chevreux 

 in: C.-R. Ass. Frang., Sess. 17 v.2 p. 349 t. 6 f. 3— i» | 1893 A. rubella (part.), A. Della 

 Valle in: F. Fl. Neapel, u20 p. 482. 



Head transversely truncate. Pleon segments 1 — 3 witli postero-lateral 

 angles acute, slightly produced, segment 4 without any of the usual gibbosity. 

 Eyes figured as having small corneal lenses. Antenna 1 in Q little shorter 

 tban antenna 2, about balf length of the body, peduncle reacbing beyond 

 penultimate Joint of peduncle of antenna 2, 2'^ Joint figured as not longer tban 

 l^S flagellum more than twice as long as peduncle; ultimate Joint of peduncle 

 of antenna 2 figured as longer than penultimate. Gnathopod 1, 6*'^ Joint sub- 

 equal in length to 5*^^ Peraeopods 1 and 2, 7^^' Joint much longer than 5*^ 

 and 6*'^ combined. Peraeopods 3 and 4 short and robust. Peraeopod 5, 2*^ Joint 

 longer than rest of leg, expansion very obliquely truncate, reacbing end of 

 3* Joint, wbich is longer tban the 4*^; 6*^ Joint not as long as 4*'i and 

 5*^ combined; 7*^ very short and broad. Uropod 3, rami broad, with 

 plumose setae on the confronted margins, outer ramus curved at the apex, 

 serrate in the upper part. Telson long, very deeply cleft, with a long 

 spinule at each apex. L. 9 5-5 mm. 



Mediterranean (üherchell [Algeria]). 



18. A. diadema (A. Costa) 1853 Araneops d., A. Costa in; Rend. Soc. ßorbon, 

 D. ser. v.2 p. 171 ] 1867 Ampelisca d., A.Costa in: Annuario-]!ilus. Napoli, r. 4 P- 45 | 

 1893 .4. d. (part.), A. Della Valle in: F. Fl. Neapel, ».20 p. 479 t. 4 f. 2; t. 37 f. 19, 20, 

 22-28, 30 38: t.38 f. 2, 7, 8, 11, 12, 14, 15; t.40 f.39,40; t.4l f.23; t.44 f. 4, 8, 9, 11; 

 t.45 f. 17. 18; t.46 f. 4— 6; t. 47 f. 29; t. 48 f. 19 | 18f)2 A. gaimardii (part.), Bäte, Cat. 

 Amphip. Brit. Mus., p. 91 | 1871 A. assimilis, A. Boeek in: Forh. Selsk. Christian., 1870 

 p. 222 ] 1891 .4. o., G. O. Sars, Crust. Norway, v. 1 p. 168 t. 58 f. 2. 



Head obliquely truncated. Ventral surface of peraeon segments 5 

 and 6 each canying a backward directed hook, segment 7 with 2 unequal 

 books directed forward. Pleon segment 3 with postero-lateral angles rounded, 

 segment 4 with sligbt anterior depressiou and carina barely indicated (ratber 

 bigb and evenly rounded, Boeck, Sars). Corneal lenses 4, lower pair at 



