Maera 435 



with very long rami (Delhi Valle). Telsoii imdescribed. Ooloiir uniform 

 yellowish white or dirty greeu. L. 12 — 16 mm. 



Tropical and South-Pacific (Fiji Islands, coral reefs; Paterson Inlet [New Zealandj), 



3. M. grossimana (Mont.) 1808 Cancer (Gamtnarus) grossimanus, Montagu 

 in: Tr. Linn. Soc. London, «j. 9 p. 97 t. 4 f. 5 | 1812 Astacus g., Pennant, Brit. Zool., 

 ed. 5 vA p.33 | 1813,14 Maera grossimana, Leach in: Edinb. Enc, v.7 p.403. 432 | 1889 

 M. g., A. M. Norman in: Ann. nat. Hist., ser. 6 «. 4 p. 126 | 1893 M. g. (part.), A. Della 

 Valle in: F. FI. Neapel, «.20 p.727 t.2 f. 10; t.21 f. 1—16; t. 41 f. 37 [ 1818 Gammarus 

 grossimanus, Lamarck, Hist. An. s. Vert., »;5 p. 182 | 1862 Moera g., Bäte, Cat. Amphip. 

 Brit. Mus., p. 188 t.34 f. 3 | 1888 M. grossimana, T. Barrois, Cat. Crust. Agores, p.38 f. | 

 1830 Gammarus impostii, H. Milne Edwards in: Ann. Sei. nat., v. 20 p.368 | 1866 Maera 

 donatoi, Cam. Heller in: Denk. Ak. Wien, t;. 26ii p. 41 t. 3 f. 26. 



Body slender, smooth. Head, rostrum miimte. Side-plate 1 acutely pro- 

 duced forward, 2"* — 4*^ quadrate. Pleon segment 3, postero-lateral corners 

 acutely produced, not seiTate. Eyes narrow, sometimes reniform, reddish 

 brown. Antenna 1, peduncle elongate, 2** Joint longer, sometimes much 

 longer than 1^*, flagellum shorter than peduncle, 22-jointed, accessory flagellum 

 8-jointed. Antenna 2 much shorter, gland-cone long, but not reaching end 

 of antepenultimate Joint of peduncle, penultimate slightly curved, longer than 

 ultimate, flagellum short, 8- or 9-joiDted. Mandibular palp slender, 1^* Joint 

 slightly produced, 3*^ Joint sti*aight, shorter than 2^. Maxilla 1, inner plate 

 with 3 setae at apex. Maxillipeds, inner plates with a spine tooth subapical 

 on inner margin, others perhaps on apex, 4*^ Joint of palp with spine-like 

 nail. Gnathopod 1 slender, 5*^ Joint rather longer than 6*^ front margin 

 distally acute, 6*^ Joint widened a little to the oblique convex pahn. Gnatho- 

 pod 2, 4^^ Joint with acute hind margin, 5**» short, cup-shaped, 6*^ large, 

 longer than broad, palm defined by a tooth, with its margin irregularly 

 notched in <S , regularly serrate or crenulate and convex in 9 , finger match- 

 ing palm, large, curved, outer margin fringed with setules. Peraeopods 1 

 and 2 slender. Peraeopods 3 — 5, 2* Joint little expanded, narrowing down- 

 ward, slightly produced in peraeopod 3, but forming no free hind corner in 

 peraeopods 4 and 5, finger with a short shai-p nail on its blunt apex. üropod S 

 not or not conspicuously reaching beyond uropod 1, the rami equal, rather 

 longer than peduncle, apices squarely truncate, tipped with setae. Telson 

 shorter than peduncle of uropod 3, cleft about ^/^ of length, lobes very 

 divergent, each haviug a tridentate apex, middle tooth longest, outer minute, 

 with intervening spinules. Colour transparent yellowish, with rosy tinting. 

 L. 6 — 9 mm. 



North- Atlantic with English Channel (Devon, Cornwall, Channel Islands; Azores; 

 West France) ; Mediterranean. 



4. M. inaequipes (A. Costa) 1847 Ämphithoe truncatipes (nom. nud.), (Spinola 

 in MS.) A. White, Crust. Brit. Mus., p. 87 | 1893 Maera t. (part.), A. Della Valle in: F. 

 Fl. Neapel, i;. 20 p. 725 t. 1 f. 2; t. 22 f. 26— 40 ] 1851 Ämphithoe inaequipes, (A. Costa 

 in:) F. W. Hope, Cat. Crost. Ital., p. 45 | 1857 Gammarus scissimanus, A. Costa in: 

 Mem. Acc. Napoli, v. 1 p. 221 t. 3 f . 7 | 1866 Maera scissimana + ^- integrimana, Cam. 

 Heller in: Denk. Ak. Wien, u26h p.40 t. 3 f. 24; p.40 t. 3 f. 25 | 1888 Moera s., F. 

 Barrois in: Bull. Soc. zool. France, u 13 p. 58 | 1888 If. s., F. Barrois, Cat. Crust. Agores, 

 p.35 textf. I 1862 M. truncatipes -\- M. blanchardi, Bäte, Cat. Amphip. Brit. Mus., p. 189 

 t.34 f. 4; p. 190 t.34 f. 5. 



Body rather robust, smooth. Head, lateral lobes rounded. Side-plate 1, 

 front corner a little produced, acute, 2^ squarely rounded, smaU. Pleon 



28* 



