230 Liljeborgia 



1. Gen. Liljeborgia Bäte 



1861 Iduna (non Keyserling & H. Blasiiis 1840, Aves!), A. Boeck in: Forh. 

 Skand. Naturf., Made 8 p. 656 | 1862 Liljeborgia (part.), Bäte (& Westwood), Brit. sess. 

 Crust., v.l p. 202 | 1862 i., Bäte, Cat. Amphip. Brit. Mus, p. 118 | 1876 L., A. Boeck. 

 Skand. Arkt. Amphip., v. 2 p. 496 | 1888 L., T. Stcbbing in : Rep. Voy. Challenger, v. 29 

 p. 980 I 1871 Lilljeborgia, A. Boeck in: Forh. Selsk. Christian., 1870 p. 154 | 1894 L., 

 G. 0. Sars, Oust. Norway, v.l p. 529 | 1865 Microplax (non Fieber 1861, Hemiptera!), 

 W. Lilljeborg in: N. Acta Soc. Upsal., ser. 3 i?. 6 nr. 1 p. 19. 



Pleon Segment 4 dorsally dentate. Antenna 1 the shorter, accessory 

 flagellum strongly developed. Mandible, cutting edge dentate, accessory 

 plate on- both maudibles, spiues of spine-row short, palp sleiider, with less 

 dilference in length than usual between the joints. Maxiila 1, inner plate 

 small, with 1 or 2 setae, outer plate with 10 spines, palp large. Maxilla 2, 

 inner plate the wider. Maxillipeds, outer plates narrow, reaching little beyond 

 1** Joint of elongate palp. Gnathopods 1 and 2, 5*^ Joint produced into a 

 considerable lobe, 6*^ Joint large, oval, finger long, more or less serrate 

 on inner margin. üropod 3, rami 1-jointed. 



8 species accepted, 2 doubtful. 



Synopsis of accepted species: 



{Pleon Segments 1 and 2 each with a single dorsal 

 tooth — 2. 

 Pleon Segments 1 and 2 each with more than 1 

 dorsal tooth — 6. 



I Pleon segment 3 without dorsal tooth; telson cleft 

 nearly to base — 3. 

 Pleon segment 3 with dorsal tooth; telson not 

 cleft nearly to base — 5. 



f Pleon segment 3, postero-lateral angles upturned 1. L. pallida . . . . p. 230 

 \ Pleon segment 3, postero-lateral angles not upturned — 4. 



(Eyes conspicuous; peraeopods 4 and 5, fxnger less 

 than half as long as 6tli Joint 2. L. brevieomis . . ]). 231 

 Eyes inconspicuous; peraeopods 4 and 5, finger 

 more than half as long as 6tli Joint .... 3. L. macrony^x . . . p. 231 



j, / Peraeopods 3 — 5, 2d Joint narrowly oblong ... 4. L. fissicornis • . p. 231 

 \ Peraeopods 3 — 5, 2d Joint broadly ovate .... 5. L. consanguinea . p. 232 



j Pleon Segments 1 and 2 quinquedentate .... 6. L, dubia p. 233 



\ Pleon Segments 1 and 2 tridentate — 7. 



f Pleon segment 3 not dentate, segment 4 unidentate 7. L. kinahani . . . p. 233 

 \ Pleon segment 3 unidentate, segment 4 bidentate 8. L. dellavallei . . p. 234 



1. Ij. pallida (Bäte) 1856 Gammarus? paUidus (uom. nud.), Bäte in: Rep. 

 Brit. Ass., Meet.25 p.o5 | 1857 G.? p., Bäte in: Ann. nat. Hist., ser. 2 ul9 p. 145 | 1862 

 Liljeborgia pallida {p&rt), Bäte & Westwood, Brit. sess. Crust., v.l p. 203 f. | 1862 L. p., 

 Bäte, Cat. Amphip. Brit. Mus., p. 118 t. 20 f. 5. 



In many respects agreeing with L. brevicornis; but: Pleon segment 3, 

 postero-lateral angles acutely toothed, with a distinct sinus above the upturned 

 point. Antenna 2, flagellum shorter than ultimate Joint of peduncle (a character 

 probably variable and less important). üropod 3, rami much shorter than 

 peduncle. Colour in life very white, back staiued with a rieh crimson 

 blotch, gnathopods 1 and 2 with a rosy hue on 6*^* Joint, and the same tint on 

 parts of the peraeopods. L. 5 mm. 



Plymouth Sound; off Torquay. 



