Xenocheira, Leptocheirus 625 



fringed with setae which reach to end of the long narrow setose 6*^; the narrowly 

 rounded apex of the 6*^ Joint is occupied by aveiy small, bent finger. Peraeopod2 

 (in figure) slender. Pevaeopod 3 (in figure) shorter, with piriform 2*^ Joint, 

 üropods 1 and 2 anned with a few acute spines. üropod 3, rami naiTOW, 

 with marginal spinules and apical setae. Telson scale-like, very short. L. 7 mm. 



Port-Jackson [East-Australia]. 



10. Gen. Leptocheirus Zadd. 



1844 Leptocheirus (Sp. un.: L. pilosus), Zaddach, Syn. Crust. Pruss., p. 7 | 1876 

 L.. A. Boeck. Skand. Arkt. Amphip., v.2 p. 547 | 1888 L., T. Stebbing in: ßep. Voy. 

 Challenger, u 29 p. 1707 | 1893 L., A. DellaValle in: F. Fl. Neapel, v.2Q p. 426 | 1894 

 L., G. 0. Sars, Crust. Norway, v. 1 p. 554 ] 1853 Leptochirus (non Germar 1824, 

 Coleoptera !), J.D.Dana in: U. S. expl. Exp., ^;. 13n p. 910 | 1853 Ptilocheirus (Sp. 

 un. : P. pinguis), Stimpson in: Smithson. Contr., v.6 nr. 5 p. 55 | 1871 ^oecfcm (Sp. un. : 

 B. typica), A. W. Malm in: Öfv. Ak. Förh., v. 27 p. 543. 



Body not strongly compressed. Pleon segment 3 the longest Head 

 without conspicuous rostrum. Side-plate 2 the largest, sometimes entirely 

 concealing the 1^*; side-plate 5 with front lobe much deeper than the hind 

 one. Antenna 1 the longer, 3<i Joint of peduncle not exceptionally long, 

 accessory flagellum usually present. Upper lip subquadrate, faintly emarginate. 

 Lower lip said to have the inner lobes sometimes partially coalesced. Mandible 

 with 6 — 16 spines in spine-row, 1^* Joint of palp not much shorter, 3^ rather 

 longer than 2^. Maxilla 1, inner plate rather large, usually only with 1 seta 

 at tip, outer with 11 spines (L. pinguis), but perhaps more commonly 10 

 (said to have 14 in Boeckia typica = L. hirsutimanus). Maxilla 2, inner 

 plate the shorter, narrowed distally, fringed on inner margin. Maxillipeds, inner 

 and outer plates well developed, but rather narrow, finger of palp short, 

 obtuse. Gnathopod 1, 2*^ Joint fringed on front, 3^—6*^ on hind margin; 

 3'^ bulging behind; 6*^ with palm well or ill-defined but short, finger short. 

 Gnathopod 2 simple, 2^, 5*^ and 6*^ joints with long fringes in front, 5*^ 

 longer than the tapering 6^^; finger weak. Peraeopods 3 — 5, 2^ Joint expanded; 

 peraeopod 5 much the longest. üropods 1 and 2, peduncle produced into 

 a long spine-like apical process, rami robust, spinöse, üropod 3, rami short, 

 longer than peduncle. Telson short. 



8 species accepted, 1 obscure. 



Synopsis of accepted species: 



i Gnathopod 1 longer and much stouter than 

 gnathopod 2 1. L. cornuaurei . . . . p. 626 

 Gnathopod 1 not longer and not much stouter 

 than gnathopod 2 — 2. 



I Antenna 1 without accessory flagellum ... 2. L. aberrans p. 626 



\ Antenna 1 with accessory flagellum — 3. 



iSide-plates 1 — 4 with spiniferous serrations of 

 hind margin 3. L. ping^s p. 627 

 Side-plates 1 — 4 without spiniferous serrations 

 of hind margin — 4. 



{ Pleon segment 4 not dentate 4. L. hirsutimanus . . p. 627 



\ Pleon segment 4 dentate — 5. 



I Pleon segment 4 with 2 dorsal teeth — 6. ' 



\ Pleon segment 4 with 3 dorsal teeth — - 7. 

 Das Tierreich. 21. Lief.: T. R. R. Stebbing, AmpMpoda I. 40 



