436 Maera 



Segment 3, postero-lateral corners not serrate. Eyes small, round, dark. Antenna 1 

 slender, 2'^ Joint louger tlian 1^*, 3'^ rather short, flagellum rather shorter 

 thau peduncle. 15 — 26-jointed, accessory flagellum 7 — 11-jointed, Antenna 2 

 rather longer tlian peduncle of antenna 1, giand-cone reaching beyond ante- 

 penultimate Joint of peduncle, ultimate scarcely shorter than penultimate, 

 flagellum subequal to ultimate, 5 — 10-jointed. Gnathopod ], 5*^' Joint as long 

 as 6*^1, 6^'' subovate, wider than 5*^ at junction of bind margin with convex, 

 ill-defiued palm. Gnathopod 2 much larger, 5*^' Joint small, cup-shaped, 

 6*^ broad, a little longer than broad, palm almost ti'ansverse, defiued by an 

 acute tooth, margin in g convex, serrulate, in ö variable but usually with 

 a deep central notch or cavity; finger powerful. Peraeopods 1 — 5 with tri- 

 cuspidate finger, that is, having a nail projecting between 2 points. Perae- 

 pods 3 — 5, 2*^ Joint moderately expanded, bind margin somewhat produced 

 downward in a rounded lobe, peraeopods 4 and 5 equal. üropods 1 — 3 

 reaching about equally far back, üropod 3, rami not very long, apically 

 obtuse, tipped with setae. Telson deeply cleft, each lobe bidentate, a spine 

 between the short outer and long inner tooth. Colour, dorsally green bronzed 

 with a little red, gnathopods 1 and 2 tiuged with green, other appendages 

 pellucid, pinkish. L. 7 mm. 



Mediterraiieaii; North-Atlantic (Azores). 



5. M. tenuimana (Bäte) 1862 Gammarus tenuimanus {^), Bäte (& Westwood), 

 Brit. sess. Crust., v. 1 p. 384 f. ] 1862 G. t., Bäte, Cat. Amphii). Brit. Mus., p. 214 

 t. 38 f. 2 I 18y5 G. t, A. 0. Walker in: Ann. nat. Hist, ser. 6 v.l5 p.471 | 1868 

 Maera batei {(S), A. M. Norman in: Ann. nat. Hist., ser. 4 v. 2 p. 416 t. 22 f . 1 — 3 | 

 1889 M. b., A. 31. Xorman in: Ann. nat. Hist., ser. 6 vA p. 127 | 1893 M. b., A. Della 

 Valle in: F. FI. Neapel, i\ 20 p. 726 | 1895 Moera b., A. O. Walker in: P. Liverp. biol. 

 Soc, V.9 p. 308 ! 1868 Megatnoera muIUdentata, (A. M. Norman in MS.) Bäte & Westwood, 

 Brit. sess. Crust., v. 2 p. 515 f. 



Pleon Segments 2—6 dorsally dentate, 2^ with 3, 3*1 with 5, 4*1^—6*^1 

 each with 2 teeth, a spinule at inner side of base of each tooth. Head, lateral 

 lobes somewhat produced, rounded. Side-plates 1 — 4 sh^ülow, 2*^ seemingly 

 somewhat large in ö. Pleon segments 2 and 3, postero-lateral corners 

 acute, not serrate. Eyes ovate, dark. Antenna 1, 2*^ Joint considerably longer 

 than 1^*, 3^ short, flagellum about as long as peduncle, 22 — 24-jointed, 

 accessory flagellum 4- or 5-joiuted. Antenna 2 subequal to peduncle of antenna 1, 

 ultimate and penultimate joints of peduncle subequal, flagellum not longer 

 than ultimate, 8-jointed. Gnathopod 1 slender, 5*^ and 6*^ joints parallel- 

 sided, 6*^ the shorter, palm slightly oblique, short. Gnathopod 2 in 9 very 

 like gnathopod 1, but 6*^ Joint ovate, palm undefined, finger small; in ö, 

 5**^ Joint small, cup-shaped, 6**' large, subrectangular, palm '/g its length, 

 with 3 tubercles, the one which defines the palm being flat-topped and setose, 

 finger strongly curved, leaving a gap when closed. Peraeopods 1 and 2 slender. 

 Peraeopods 3 — 5, 2*^ Joint not much expanded, in peraeopods 4 and 5 not 

 forming a free corner below, finger strong. üropod l much longer than 

 uropod 2, but scarcely reaching beyond peduncle of üropod 3. üropod 3, 

 peduncle long, very stout, rami subequal, very long, laminar, fringed with 

 spines. Telson with 1 spine at apex of each lobe. L. 6 — 9 (15?) mm. 



English Channel (Gruernsey); Menai Strait and Liverpool Baj% depth 19 — 38 m; 

 Moray Firth, at mouth of rivers. 



6. M. westwoodi Stebb. 1855 Gammarus kroyeri (non H. Rathke 1843!), 

 T.Beil in: Belcher, Last arct. Voy., v.2 p.405 t. 34 f. 4 | 1862 Megamoera kröyeri, Bäte, 

 Cat. Amphip. Brit. Mus., p. 229 t. 40 f. 4 | 1893 Maera? k., A. Della Valle in: F. Fl. 



