100 Ampelisca 



19 

 20 

 21 



22 



23 

 24 



j Read obliquely truncate 18. A. diadema . . . . j). 107 



\ Head transversely truncate 19. A. acinaces . . . . p. 108 



f Autenna 2 very short 20. A. spinimana . . . j). 109 



) Antenna 2 not very short — 21. 



) Cornea not forniing a lens 21. A. compacta . . . . p. 109 



\ Cornea forming a lens — 22. 



/ Pleon Segment 4. dorsal apex raised above 

 ) Segment 5 — 23. 



I Pleon segraent 4, dorsal ape^ not raised above 

 Segment 5 — 24. y 



l Peraeopod 5, finger not longer than ö^h Joint 22. A. typica p. 109 



\ Peraeopod 5, finger longer than Q^ Joint . . 28. A. zamboangae . . p. 110 



J Head obliquely truncate 24. A. tenuicornis . . . p. 110 



\ Head transversely truncate 25. A. sarsi p. 111 



1. A. eschriehtii Kreyer 1842 A. e., Kreyer in: Xaturh. Tidsskr., i'.4 p. 155 1891 

 A. e., A. eschrichti, G. O. Sa*s, Crust. Norway, v. 1 p. 174 t. 61 f. l | 1893 A. eschriehtii 

 (part.), A. DellaValle in: F. Fl. Neapel, u 20 p. 475 | 1894 A. e., T. Stebbing in: Eijdr. 

 Dierk., v. 17 p. 17 | 1862 A. ingens {Pseudophthabmis i. Stimpson in 31S.), Bäte, Cat. 

 Amphip. Brit. Mus., p. 92 t. 15 f. 2 | 1871 A. dubia -f- Ä. eschrichti -\- A. propinqva, 

 A. ßoeck in: Forh. Selsk. Christian., 1870 p. 224, 225. 



Peraeon segments 6 and 7 and pleon Segments 1 — 4 dorsally carinate, 

 composite 5*^ and 6*^^ of pleon witli a pair of tubercles flanking an excavation. 

 Pleon Segment 3 with margin moderately sinuous over acutely prominent 

 postero-lateral angles. Corneal lenses distinct, low er pair a little removed 

 from lower front coruers of head, pigment well defined, bright red. Antenna 1 in 

 Q reaching beyond peduncle of antenna 2, flagellum 27.2 times as long as 

 peduncle, with 30 joints. Antenna 2 twice length of antenna 1, ultimate and 

 penultimate joints of peduncle subequal. Peraeopods 1 and 2, 7* Joint con- 

 siderably longer than 5*** and 6*^ combined. Peraeopod 5, 2'^ Joint longer than 

 all the rest of the leg, produced below the 3*^, expansion obliquely truncated, and 

 lower Corner broadly rouuded, h^^ Joint projecting anteriorly, 6*^ narrow, shorter 

 than 4*^1 and 5*^ combined, 7*^^ more than half length of 6*^. üropod 3 

 with rami lanceolate, fringed with plumose setae and a few spinules. Telson 

 oblong, with a small denticle at the side of each acute apex, without any 

 dorsal spinules. Body semipellucid, tinged with yellowish, mottled with 

 orange and pinkish pigment. L. reaching 30 mm. 



Arctic Ocean. widely distributed; Skagerrak (Bohuslän). Depths to 254 in. 



2. A. brevicomis (A. Costa) 1853 Araneops b.. A. Costa in: Kend. Soc. Borbon., 

 n. ser. ».2 p.l71 | 1893 Ampeliscab. (part.). A. Della \'!ille in: F. Fl. Neapel, r.20 p.473 

 t. 4 f. 4; t.37 f. 29; t. 38 f. 3. 5, 6, 9, 13; t. 43 f. 20; t. 44 f. 26— 28; t. 45 f. 5— 10 (but 

 see p. 109); t. 47 f. 5-16 | 1855 A. laevigata, W. Liljeborg in: Öfv. Ak. Förh., v. 12 

 p. 123 I 1891 A. l, G. 0. Sars, Crust. Norway, v. 1 p. 169 t. 59 f. 1 | 1856 Tetromaius 

 beUianus, Bäte in: Rep. Brit. Ass., 31eet. 25 p.58 1. 17 f.D5 | 1857 T.h., Bäte in: Ann. 

 nat. Hist., ser. 2 v. 19 p. 139. 



Pleon Segment 3 deeply bisinuated over acutely prominent postero- 

 lateral angles, segment 4 with small dorsal hump at the end. Corneal lenses 

 small, distinct, lower pair at lower corners of head, pigment dark brownish 

 (Sars) or bright red (DellaValle). Antenna 1 in 9 not (in ö scarcely) reaching 

 beyond penultimate Joint of peduncle of antenna 2, flagellum with 10 joints, not 

 twice length of peduncle; antenna 2 in 9 scarcely more than half length of body, 

 ultimate Joint of peduncle much shorter than penultimate. Peraeopod 1, 4*^ Joint 



