Stebbingia, Pontogeneia 359 



rami spinulose. üropod 3, rami equal, lanceolate, acute. Telsou about ^^ 

 as broad as long, veiy little tapering, cleft to the centre, the lobes gradually 

 dehiscent, with truncate notcbed apices. Colour dull green. L. 17 mm. 



South-Atlantic (South Georgia). Under stones, at low tide. 



4. Gen. Pontogeneia Boeck 



1871 Pontogeneia (Sp. un.: P. inermis), A. Boeck in: Forh. Selsk. Christian., 

 1870 p. 193 I 1876 P., A. Boeck, Skand. Arkt. Amphip., v.2 p.334 | 1893 P., G. 0. Sars, 

 Crust. Norway, v.l p.451 | 1893 P. (part.), A. Della Valle in: F. Fl. Neapel, u 20 

 p. 615 I 1873 Pontogenia (non Claparfede 1868, Polychaeta!), E. v. Martens in: Zool. 

 Kec, v.% p. 190 I 1888 Atylopsis (part.), T. Stebbing in: Rep.Voy. Challenger, t;.29 p.924. 



Body without dorsal teeth. Head, rostrum small or obsolete, post- 

 autennal corners produced. Side-plates not very large, 4*^ emarginate. 

 Antennae 1 and 2 in d calceoliferous and longer than in Q , antenna 1 

 the shorfcer, without accessory flagellum. Upper lip rounded or slightly 

 emarginate. Lower lip with small inner lobes. Mandible normal, palp strong. 

 Maxilla 1 with about 6 setae on inner plate, 11 spines on outer, 2*^ Joint 

 of palp large. Maxilla 2, inner plate fringed on inner margin. Maxillipeds, 

 outer plates not reaching end of palp's 2*^ Joint, apically fringed with slender 

 spines, 3*^ Joint of palp produced over base of finger. Gnathopods 1 and 2 

 similar, feeble, subchelate, palm sh orter than bind margin of Q^^ Joint. Peraeo- 

 pods 3 — 5, 2*^ Joint well expanded, the remaining joints normally slender. 

 üropod 3, peduncle short. Telson deeply cleft. 



3 species accepted, 3 doubtful. 



Synopsis of accepted species: 



J Grnathopod 2, 5tt Joint longer than 6tli 1. P. inermis . . . p. 359 



\ Gnathopod 2, 6tli Joint longer than öth — 2. 



J Apices of telson serrate 2. P. magellaniea . p. 360 



\ Apices of telson sinooth 3. P. danai . . . . p. 360 



2 



1. P. inermis (Kröyer) ?1780 Oniscus abyssimis, 0. Fabricius, Fauna Groenl., 

 p. 261 I 1838 Amphithoe inermis ($)-)- A. crenulata ((5), (Reinhardt in MS.) Kröyer in: 

 Danske Selsk. Afh., v.l p. 275 t. 3 f. IIa— g; p. 278 t. 3 f. 12 a— g [ 1862 Atylus i. + 

 A. crenulatus, Bäte, Cat. Amphip. Brit. Mus., p. 138 t. 26 f. 5; p. 139 t. 26 f. 6 | 1866 

 Paramphithoe i., Goes in: Öfv. Ak. Förh., t;. 22 p. 524 | 1874 P. i., Buchholz in: Zweite 

 D. Nordpolarf., v. 2 p. 366 ] 1871 Pontogeneia i., A. Boeck in : Forh. Selsk. Christian., 

 1870 p.l94 ! 1876 P. i., A. Boeck, Skand. Arkt. Amphip.. v.2 p. 335 t. 21 f. 4 | 1893 

 P. i., G. O. Sars, Crust. Norway, v. 1 p.451 t. 159 i 1893 P. i., A. Della Valle in: F. Fl. 

 Neapel, v. 20 p. 617 t. 59 f. 29. 



Back evenly rounded. Head, rostrum very small, lateral corners obtusely 

 rounded, separated by an angular incision from the triangulär post-antennal 

 lobes. Side-plates 1 — 3 rounded quadrangular, lower margin minutely crenulate, 

 4*^ considerably larger. Plcon segment 3, postero-lateral corners scarcely 

 produced, lateral margin bulging above abruptly. Eyes oblong reniform, 

 light red. Antenna 1, P* Joint not much longer than 2^, 2"^ twice as long 

 as '6^, 3^ a little produced at apex, flagellum about twice as long as peduncle, 

 many-jointed. Antenna 2, ultimate and penultimate joints of peduncle sub- 

 equal, flagellum about twice as long as peduncle. Antennae 1 and 2 in c? 

 with large calceoli on confronting edges of ultimate and penultimate joints 

 of peduncle, but none on the long slender flagella. Maxillipeds. outer plates 

 fringed with spines on inner margin. Gnathopods 1 and 2, 5**^ Joint slender, 



