Pontocrates, Synchelidium 241 



verv gTeatly, longer than peduncle. Guathopod 1, process of 5*^^ Joint reaching 

 niuch beyond bind margin of 6*^\ whicli is oval, constricted at base, considerably 

 expauded distally, palm obliquely ciirved, soraewhat longer tbau bind margin, 

 edge smootb witb row of minute curved spinules. Gnathopod 2, process of 

 5*'' Joint produced very little beyond cbela, G^^ Joint scarcely tapering, nearly 

 6 tiraes (Sars) or 5 times (Schneider) as long as broad, thumb of cbela 

 much broader than finger. Peraeopods l and 2 rather stout, 6*^ Joint sborter 

 than 5^^, finger extremely small. üropod 3, peduncle rather long, rami 

 eacb with 2 spinules. Telson rouuded, apex obtusely truncate, beset witb 

 8 spinules (Schneider). Colour yellowish, antero-dorsally tinged with orange. 

 L. c 6 mm. 



Arctic Ocean (Finmark). Depth 11 — 19 m. 



3. P. arenarius (Bäte) 1858 Kroyera arenaria, Bäte in: Xat. Hist. Northumb., 

 r. 4i p. 15 t. 2 f . 1 I 1862 Kröyera a., Kroyea (laps.) a., Bäte, Cat. Amphip. Bi-it. Mus., 

 ]). 106 t. 17 f. 4 I 1893 Kröyera a., A. DellaValle in: F. Fl. Neapel, v. 20 p. 554 \ 1888 

 Pontocrates arenarius, T. Stebbing in: Rep. Voy. Challenger, v. 29 p. 307 | 1889 P.a., 

 Hoek in: Tijdschr. Nederl. dierk. Ver., ser.2 ».2 p. 192 t. 9 f. 7, 8 | 1861 Oedicerus nor- 

 vegicus. A. Boeck in: Forh. Skand. Naturf., Mode 8 p. 650, 652 [ 1871 Pontocrates n., 

 A. Boeck in: Forh. Selsk. Christian., 1870 p. 171 j 1876 P. n.-\- P. n. var., A. Boeck, 

 Skand. Arkt. Amphip., v.2 p. 288 t. 16 f. 4; t. 15 f. 7 ! 1895 P. n., G. 0. Sars, Crust. 

 Norway, v. 1 p. 693 t. vi f. 2; t. vii f. 1. 



Robust, Segments dorsally sharply defined. Eostrum short, slightly 

 curved. Side-plate 1 with distal part transversely truncate, 2*^ tapering to 

 au obtuse point, 3<^ with oblique slightly insinuate distal margin, 4*^ much 

 deeper than the preceding, little produced at lower bind corner. Eyes 

 rounded, light red with no whitish coating. Antenna 1 in Q not much sborter 

 than antenna 2, 2*^ Joint a little sborter than l***, flagellum subequal to 

 peduncle, with 9 joints, in d stouter, flagellum with 11 joints, first 6 or 7 densely 

 hirsute. Antenna 2, ultimate and penultimate joints of peduncle subequal, flagellum 

 in " as long as peduncle, in (5 very much longer, filiform. Gnathopod 1, process of 

 5^^' Joint reaching beyond G^Ji, which gradually widens distally, palm nearly 

 transverse, not as long as bind margin, densely fringed with long stiff setae. 

 Gnathopod 2 very slender, process of 5^'' Joint produced considerably beyond 

 cbela, 6*^ Joint very narrow, thumb of cbela little broader than finger. 

 Peraeopods 1 and 2, 5*'i Joint broad, scarcely longer than 6*, finger almost 

 obsolete. Peraeopod 5, 2^ Joint oval quadrangular, with straight bind margin. 

 üropod 3, peduncle sborter than in the 2 preceding species, rami witb a 

 few spinules. Telson oval, apex evenly rounded. Colour semipellucid, whitish, 

 slightly tinged with yellowish. L. Q 6, d 6"5 mm. 



North-Sea (Skudesnes, depth 19 m; Dutch and British coasts); Christianiafjord. 



5. Gen. Synchelidium 0. Sars 



1871 Pontocrates (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.l71 | 1892 

 Synchelidium, G. 0. Sars, Crust. Norway, v. 1 j). 317. 



Head with more or less strongiy deflexed rostrum. Side-plate 1 distally 

 expanded, with straight lower margin, 4*'^ and 5*^ rather large. Eyes 

 contiguous, at base of rostrum. Antenna 1 in Q longer than antenna 2, 3*^ Joint 

 rather long. Antenna 2 m ö very elongate. Mandible, molar small, conical, 

 tipped with 1 spine, ?>^ Joint of palp in o small. Maxiila 1 as in Pontocrates 

 (p. 239). Maxiila 2, plates short, outer apically truncate. Maxillipeds, outer 



Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda I. 16 



