134 l'hoxocephaliis 



1. Gen. Phoxocephalus Stebb. 



1842 Phoxus (non Billberg 1820, Coleoptera!) (pari.), Kreyer in: Naturh. Tidsskr., 

 V. 4: p. 150 i 1842 Spinifer (non üafinesque 1831, Mollusca! fide: L. Agassiz, Nomencl. 

 zool., Moll. p. 84) (part.), (Holbell in MS.) Krej'er in: Naturh. Tidsskr., u4 p. 151 | 

 1888 Phoxocephalus (nom. nov.), T. Stebbing in: Rep. Voy. Challenger, t;. 29 p. 810| 

 1891 F., G. O. Sars, Crust. Norway, v.l p. 143 | 1893 P. (part.), A. DellaValle in: 

 F. Fl. Neapel, v. 20 p. 738. 



Body compressed. Hood more or less acute. Side-plates with a few 



simple setae oii lowev margin, 4*^ not much expanded backward, 5*^ with 



bind lobe rounded. Antenna 1 shorter than antenna 2, the 



latter in ä with long tiliform flagellum, calceoliferous. Mandible 



with well developed molar and 2<* and 3<^ joints of palp 



not greatly expanded. - Maxiila 1, outer plate with 7 — 9 spines, 



palp 1-jointed, small, with slender spines. Maxilla 2, plates 



nearly equal. Maxillipeds, outer plates scarcely larger than 



inner, fringed with curved spine-teeth, '6^ Joint of palp oval. 



Gnathopod 2 larger than guathopod 1. Peraeopod 3 short, 



„. g^ 2"^ Joint expanded. Peraeopods 3 and 4, 4**^ and 5*^ joints 



p. hoiböm. not expanded. Peraeopod 5 (Fig. 37), 2*^ Joint large, clypei- 



Peraeopod .5. form, üropod 3 in Q , inner ramus unarmed, rauch shorter than 



[After G r + ^ ' 



Sars] outer, in d much larger than in Q , both rami well developed, 

 lanceolate, fringed with plumose setae. Telson. lobes rather 

 narrow, especially in d. 



3 species accepted, 4 doubtful. 



Synopsis of the accepted species: 



) Eyes ill developed 1. P. holbölli . . p. 134 



) Eyes well developed — 2. 



( Gnathopod 2, 6*^1 Joint not longer than broad ... 2. P. bassi . . . p. 135 



) Gnathopod 2, 6tli Joint longer than broad 3. P. kergueleni . p. 135 



1. P. holbölli (Kreyer) 1842 Phoxus h. {Spinifer spi-ßosissimus + S. flagelli- 

 forinis Ho'lbell in MS.), Kreyer in: Naturh. Tidsskr., vA p. 151 | 1845 P. h., Kreyer 

 in: Xaturh. Tidsskr., ser. 2 v.l p. 551 | 1876 P. holbollii, S. I. Smith (& Karger) in: Tr. 

 Connect. Ac, ü.3 p. 29 | 1888 Phoxocephalus holbölli, T. Stebbing in: Rep. Voy. Challenger, 

 t\29p. 1717 I 1891 F.h., G. O. Sars, Criist. Norway, v.l p. 144 t.49 1 1893 P. h., A. Della 

 Valle in: F. Fl. Neapel, i;.20 p. 740 | 1853 Phoxus kroyeri, Stimpson in: Smithson. Contr., 

 V. 6 nr. 5 p. 58. 



Body glabrous. Hood acute, triangulär, postero-antennal corners of head 

 nearly quadrate. Side-plate 1 little expanded below, 1^* — 3'^ with about 10 setae 

 on hinder part of lower margin, 4*^ angled at the emargination. Pleon segmentS, 

 postero-lateral augles slightly rounded. Eyes small. nearly round, an irregulär 

 mass of whitish pigment without any trace of visual elements (Sars). Antenna 1, 

 1®* Joint rather longer than 2^ and '6^ combined. flagellum 6-, accessory flagellum 

 4-jointed. Antenna 2, penultimate Joint of peduncle rather large, with 3 rows of 

 spines, flagellum in 9 6-J0iuted, in d with numerous joints, nearly reaching end of 

 body. Gnathopods 1 and 2, 6*^^ Joint oblong oval, a little dilated distally, palm 

 shorter than bind margin; gnathopod 2 only a little larger than gnathopod 1. 

 Peraeopod 3, 2^ Joint broader above than below. Peraeopod 4 about half the 

 length of the body. Peraeopod 5 (Fig. 37), 2"^ Joint as long as rest of limb, 

 as broad as long, bind margin strongly curved, finely serrate. üropod 3 in 9 , 

 inner ramus scarcely half as long as outer, 2*^ Joint of outer less than half 

 length of 1^*; in d rami nearly equal. narrowly lanceolate, plumose, outer 

 with 3 spines on oiiter margin. Telson much longer than broad, cleft to 



