360 Pontogeneia 



longer than 6*^, 6*^ slightly wideniüg distally, palm somewhat oblique, 

 sligbtly defiiied, finger sraall; 6*'^ Joint rather more widened distally in 

 gnathopod 2 than in gnathopod 1, with the palm rather less oblique and 

 therefore better defined. Peraeopods 3 — 5, 2^ Joint rounded oval with bind 

 margin smooth, that of peraeopod 5 much the largest. Uropod 2, outer 

 ramus much shorter than inner; uropod 3, rami subequal, lanceolate, about 

 twice as long as peduncle, fringed with spinules and setae. Telson oblong 

 oval, cleft beyond the middle, lobes rather dehiscent, obtusely pointed. Trans- 

 parent, colourless. L. .9 12 mm, cS somewhat less. 



Arctic ücean and North-Sea (Greenland, Siberia, West-Norwaj-). 



2. P. magellaniea (Stebb.) 1888 Atylopsis magellanictis, T. Stebbing- in: Rep. 

 Voy. Chall enger, i'. 29 p. 925 t. 79 | 1893 Atylns m., A. Della Valle in: F. Fl. Neapel, 

 V.20 p. 701. 



Head angular in front, not rostrate. Side-plate 1 distally widened, 

 4*'i much the widest. Pleon segment 3, postero-lateral angles acutely upturned, 

 and lateral margin bulging above a small sinus. Eyes rather large, renifoi'm. 

 Antenna 1, P* Joint rather longer than 2*^, remainder, and all but the basal 

 joints of antenna 2, unknown. Upper lip slightly emarginate, so as to be 

 unequally bilobed. Maxillipeds, outer plates fringed with subraarginal spinules. 

 Mouth-parts otherwise agreeing well with P. inermis (p. 359). Gnathopod 1, 

 5* Joint as long as 6*^ 6*'^ more than twice as long as broad, palm only slightly 

 oblique, defined by a group of spines at the obtuse angle, finger small, 

 curved, denticulate on inner margin. Gnathopod 2 rather similar but longer, 

 5*^ Joint not so long as 6*'', which is rather widened distally. Peraeopods 3 — 5 

 nearly as in P. inermis, but bind margin of 2<^ Joint slightly serrate. Uropod 3, 

 peduncle shorter than one of the rami, the other ramus unknown. Telson 

 not longer than peduncle of uropod 3. not much longer than broad, cleft 

 for about % of length, lobes a little dehiscent near the broad apices, which 

 form 3 denticles on their slope from the lateral margins. L. about 7 mm. 



Strait of Magellan (Cajje Virgins). Depth 100 m. 



3. P. danai (Gr. W. Tlioms.) 1879 Atylus dania, A. danai, U. M. Thomson in: 

 Tr. N. Zealand Inst., t?. 11 p. 238, 248 t. 10 f.Cl ] 1879 A. danai, G. M. Thomson in: 

 Ann. nat. Hist., ser. 5 vA p.330 j 1893 A. d., A. Della Valle in: F. Fl. Neapel, u20 p.703. 



Head with short rostrum, post-antennal corners blunt, little produced. 

 Eyes large, round, black. Antenna 1 about 7^ shorter than antenna 2, 

 joints of peduncle short, dentate on lower margin. flagellum witli more than 

 25 joints, every 3*^ or 4*^ produced to a setose tubeicle. Antenna 2, ultimate 

 and penultimate joints of peduncle rather short, equal, flagellum 40 — 50-jointed. 

 Side-plates, moutli-parts and peraeopods apparently in very dose agreement 

 with those of P. magellaniea, and gnathopods 1 and 2 not very different, 

 but with palm imperfectly defined and finger smooth. Also gnathopod 1, 

 at least in 9 , has the 6^'^ Joint larger and more ovate than that of gnatho- 

 pod 2. Uropods 1 and 2, peduncle longer than rami, outer ramus shorter 

 than inner. Uropod 3, rami about twice as long as peduncle, thickly studded with 

 Short spines and fringed with long cilia, probably in both sexes, certaiuly 

 in 9 . Telson cleft to nearly half its length, apices rounded, smooth, with 

 a spinule somewhat remote from them on each side. Colour semi-transparent, 

 with dark bluish spots. L. 7-5 mm. 



South-Pacific (Dunedia [New Zealand]). Rock pools. 



