Cleippides 301 



:^AH:essury üagelliMii. Upper lip little or not at all emarginate. Lower lip 

 with inner lobes obsolescent. Mandible, cutting edge not dentate, accessory 

 plate denticulato, spine-roAV small, or accessoiy plate and spine-row wanting 

 (Heller), molar witli a circular ridge, 2*^ and 3*^ joints of palp distally 

 ^idened. Maxilla 1, inner plate with several setae, outer with 11 spines, 

 P* Joint of palp about half as long as 2*^. Maxilla 2, inner plate rather 

 the shorter, friuged on inner margin. Maxillipeds, inner plates of moderate 

 Bize, outer not nearly reaching end of palp's 2^ Joint (if Kr0yer's figure 

 can be trusted against bis text), friuged with spine-teeth on inner margin, 

 palp stout. 1''* — 3*^ joints subequal in length, 4*^ small. Gnathopod 1 

 weakly subchelate, 5**^ Joint much longer than 6*^ Peraeopods 1 — 5 slender, 

 3d — 5th ^YJth 2'* Joint little expanded. üropod 3, rami lanceolate, equal. 

 Telson small. entire. 



2 species. 



Synopsis of speeies: 



l'hree segments, each produced iuto a dorsal tooth . . 1. C. tricuspis . . . p. 301 

 Four Segments, each produced into a dorsal tooth. . . 2. C. quadricuspis . p. 301 



1. C. tricuspis (Kreyer) 1846 Acanthonotus t, Kreyer in: Naturh. Tidsskr., 

 ser. 2 r.2 p. 115 [ 1816 A. t, Kreyer in : Voy. Nord, Crust. 1. 18 f. 1 a— v [ 1862 Dexamine t, 

 Bäte, Cat. Aniphip. Brit. Mus., p. 133 t. 24 f . 5 | 1866 Paramphithoe t., Goes in: Öfv. 

 Ak. Förh., r. 22 p. 525 \ 1871 Cleippides t., A. Boeck in: Forh. Selsk. Christian., 1870 

 p. 201 j 1876 C. t., A. Boeck, Skand. Arkt. Amphip., v. 2 p. 358 | 1893 Acanthozone t. 

 (part.), A. Della Valle in: F. Fl. Neapel, v. 20 p. 608 t. 59 f. 13, 14. 



Without cariua. Peraeon segment 7 and pleon segments 1 and 2 

 •^ach produced into a large flat dorsal tooth. Head, rosti'al projection 

 small. Side-plates 1 — 3 deeper than broad, lower corners rouuded. Side- 

 plate 4 rather broader. slightly emarginate behind. Pleon segment 3, 

 postero - lateral angles outdrawn into a tooth, above which is another. 

 separated by a rather large sinus. Eyes narrowly reniform, dark, the 

 colour disappearing in spirit. Antenna 1 long, thin, 1^*' Joint as long as 

 2'i aud 3<^ eombined. flagellum thrice as long as peduncle, 50 — 60-jointed. 

 Antenna 2 much shorter, ultimate Joint of peduncle rather shorter than 

 penultimate, flagellum rather longer than peduncle, 40-jointed. Gnatho- 

 pod 1,5*'^ Joint much longer than the narrowly oval 6*^ palm undefined, 

 finger small, but strong, curved, bidentate. Gnathopod 2 rather ionger. 

 5*^ Joint narrow, scarcely longer than the narrowly quadrangular 6***. 

 Peraeopods 3 — 5, 2*^ Joint larger in peraeopod 4 than in 3*^, in 5**^ than 

 in 4*^, narrowing downward, the bind margin serrate, tending to concave. 

 üropod 1, outer ramus little shorter than inner; uropod 2, outer ramus much 

 shorter than inner. Telson oval, feebly acuminate. Colour chestnut-brown. 

 Ti. reaching 16 mm or more. 



Arctic Ocean and North-Atlantic (South-Greenland, Spitzbergen). 



2. C. quadricuspis Heller 1875 C. q., Cam. Heller in: Denk. Ak. Wien, 

 '/■.35 p.32 t. 3 f. 1—16 j 1885 C. q., G. 0. Sars in: Norske Nordhavs-Exp., u6 Crust I 

 1). 174 t. 14 f. 5 I 1893 Acanthozone tricuspis (part.), A. Della Valle in: F. Fl. Neapel, 

 V. 20 p. 603. 



Peraeon segment 7 and pleon segments 1 — 3 bluntly carinate and 

 each produced into a long dorsal tooth. Head, rostrum small, acute, lateral 



