512 Acanthogüiiimarus, Gammaridarum species incertae sedis 



Antenua 1 as long as body, almost tbrice as long as anteniia 2, with peduncle 

 stoiiter and almost twice as long, flagellum 27-jointed, accessory flagellura 

 2-jointed. Auteuna 2, flagellum 8-jointed. Gnathopod 1, 6*^^ Joint piriform. 

 ■Gnathopod 2, 6*^ Joint oblong, widened towards the palm. Peraeopods 3 — 5, 

 2^ Joint not widely expauded, bind margin acute-angled at top, then convex, 

 concave and spinöse below, outer surface longitudiüally carinate, tbe carina 

 in peraeopods 3 and 4 armed with 2 or 3 spines and produced below. üropod 3, 

 outer ramus scarcely longer than tbe inner, with plumose setae only on 

 inner margin, the inner ramus baving them on both margins. Telson divided. 

 Colour greenish to yellowish, with golden yellow tips to carinae and teeth. 

 L. 12 mm. 



Lake Baikal. On or near Spongia baicalensis. 



Gammari nominatim, reapse incertae sedis. 



Gamraarus eaudisetus Viv. 1805 G. c, Viviani, Phosphor. ]\Iaris, p. 7 t. 1 

 f. 3, 4 I 1888 G. c, ?Hyi)eria medusarum, T. Stebbing in: ßep. Voy. Challenger, u29 

 p. 76, 78 I 1893 G.? c, A. Della Valle in: F. Fl. Neapel, v.2ö p. 766 | 1872 Hyperia c, 

 A. Boeck, Skand. Arkt. Araphip., v. 1 p. 39. 



Genoa harbour. 



G. chilensis Nie. 1849 G. c, H. Nicolet in : Gay, Hist. Chile, v. 3 p. 239. 



Body smooth, without spines or tubercles. Eyes round, very small. Antenna 1 

 Tery slender, much longer than antenna 2, Ist joint stout, cylindric. Antenna 2 con- 

 siderably stouter, peduncle very long, hirsute, flagellum short. Gnathopods 1 and 2 

 subequal, 6th Joint little dilated, elongate, suboval. Peraeopods 4 and 5 very long, 

 spinulose. L. 8 mm. 



Sea of Chili. 



G. eireinnatus Viv. 1805 G. c, Viviani, Phosphor. Maris, p. 9 t. 2 f. 9, 10 [ 1888 

 'Cr. c, AmjMthoe? c, T. Stebbing in: Rep. Voy. Challenger, ».29 p. 76, 78 | 1893 Elas- 

 mojnis? c, A. Della Valle in: F. Fl. Neapel, u 20 p. 766. 



Body subcylindrical. Pleon segments 1 — 3, postero-lateral corners angular. 

 Antenna 1 short, much longer than antenna 2, 2d joint in figure much shorter than Ist, 

 Limbs all slender. Uropod 3 slightly suggestive ofAmpithoe (p. 631). Colour yellowish 

 to faint reddish. 



Genoa harbour. 



G. erassimanus Viv. 1805 G. c, Viviani, Phosphor. Maris, p. 10 t. 2 f. 7, 8 | 1872 

 G. ? c, A. Boeck, Skand. Arkt. Amphip., v. 1 p. 39 | 1888 G. c, T. Stebbing in : Rep. 

 Voy. Challenger, u 29 p. 77 ] 1893 G. c, A. Della Valle in: F. Fl. Neapel, v. 20 p. 726 | 

 1862 Moera truncatipes (part.)?. Bäte, Cat. Amphip. Brit. Mus., p. 189. 



Antenna 1, 2d joint longer and thinner than Ist. Antenna 2 only half as long, 

 Eyes rather broad, black. Front feet with granulär chela. 



Genoa harbour. 



G. dubius Johnst. 1827 G. d., G. Johnston in: Zool. J., n3 p. 178 | 1888 G. d., 

 T. Stebbing in: Bep. Voy. Challenger, u 29 p. 131 ] 1893 G. d., Ämphithoe (part.)?, 

 A. Della Valle in: F. Fl. Neapel, v. 20 p. 766. 



Eyes roundish, black. Antennae 1 and 2 slender, nearly equal, about half as 

 long as body. Antenna l, Ist joint longer than 2d. Gnathopods 1 and 2 like those 

 ■of Ampithoe rubricata (p. 639), but rather smaller, 6*^ Joint oblong, not much dilated. 

 Anterior legs short, hinder long. Uropods 1 — 3 long. Telson divided. L. 4 — 6 mm. 



North-Sea (Berwick). Rock pools among Confervae. 



