524 Talitridae, Talitrus 



11 



12 



Gnathopod 2 having the 5tli joint masked by 



the 4tli in the (5 11. Gen. Hyale .... p. 559 



Gnathopod 2 (Fig. 97) having the 5tli joint 

 produced between the 4tli joint and 6th in 

 the cJ — 12. 



l Telson (Fig. 98) undivided 12. Gen. Hyalella . . . p. 574 



\ Telson (Fig. 100) more or Icss divided .... 13. Gen. Allorchestes . p. 581 



1. Gen. Talitrus Latr. 



1793 [Subgen.] Gammarellus (part.), J. F. W. Herbst, "Naturg. Krabben Krebse, 

 V.2 p. 106 1 1802 Talitrus (part.), (Latreille in:) Eosc, Crust., v.l p. 78; v.2 p. 148 | 

 1802 & 03 T. (part.)-, Latreille, Hist. Crust. Ins., v.S p.38; v.6 p.294 [ 1888 T., T. Stebbing 

 in: Rep. Voy. Challenger, v.29 p. 1682 j 1890 T., G. O. Sars, Crust. Norway, v.l p. 22 | 



1891 T., T. Stebbing in: Ann. nat. Hist., ser. 6 v.S p. 324 | 1893 T., A. Della Valle in: 

 F. Fl. Neapel, v. 20 p. 492 ] 1835 Thalitrus, Guerin(-Meneville) in: Exp. Moree, Atlas 

 p. 3 I 1851 Subgen. Tcditrorchestia (Sp. un.: Talitrus cloquetii), F.Brandt in: Bull, 

 phys.-math. Ac. St.-Petersb., v. 9 p. 137. 



Peraeon dorsally broad, pleon compressed. Side-plate 1 naiTow, 5*^ 

 broad and deep. Antenna 1 much shortev than peduncle of antenna 2. 

 Antenna 2, basal Joint or joints soldered to head, with no gland-cone, 

 ultimate joint of peduncle the lougest joint. Epistome forming an obtuse 

 angle with upper lip. Upper lip distally rounded. Lower lip with tuft of 

 setules at inner corner of principal lobes. Maxilla 1, palp minute, 2-jointed. 

 Maxillipeds, palp rather short and broad, 4*^ joint wanting, Gnathopod 1 

 sti'onger than gnathopod 2, simple, 5*^ joint strong but linear. Gnathopod 2 

 feeble and similar in both sexes, 5^^ joint expanded proximally, 6^^ produced 

 beyond a minute chela-forming finger. Peraeopod 2 with short, notched 

 finger. Peraeopods 4 and 5 with expansion only of 2*^ joint. Branchial 

 vesicles twisted or bent. Marsupial plates small, lanceolate. Telson simple. 



4 species accepted, 2 doubtful. 

 Synopsis of accepted species: 



Peraeopods 3 and 4, 2d joint narrowing distally . . 1. T. sylvaticus . p. 524 

 Peraeopods 3 and 4, 2d joint regularly expanded — 2. 



{Antenna 1 reaching much beyond the penultimate 

 Joint of peduncle of antenna 2 2. T. alluaudi . . p. 525 

 Antenna 1 not reaching much beyond penultimate 

 Joint of peduncle of antenna 2 — 3. 



f Antenna 2, peduncle stout 3. T. saltator . . p. 525 



\ Antenna 2, peäuncle slender 4. T. gulliveri . . p. 526 



1. T. sylvaticus Hasw. 1879 T. s., Haswell in: P. Linn. Soc.N. S. Wales, v. 4 

 p. 246 f. 7 f . 1 I 1885 T. s. (T. affinis, laps. corr. : T. assimilis); Haswell in: P. Linn. 

 Soc. N.S.Wales, u.lO p.95 ^10 f . 1 | 1893 T. s., G. M. Thomson in: P. R. Soc. Tasmania, 



1892 p. 15 t.4 f. 1-10 I 1893 T. s., A. Della Yalle in: F. Fl. Neapel, v. 20 p. 512 | 1880 

 T. assimilis, Haswell in: P. Linn. Soc. N.S.Wales, v.6 p. 97 t. 5 f . 1 | 1898 Ch-chestia 

 sylvicola (err., non J.D.Dana 1852!), G.M.Thomson in: Tr. N. Zealand Inst., v. 31 p. 203. 



Side-plate 5 much the broadest. Eyes small, round. Antenna 1, 1^*" Joint 

 compressed, 2'^ the longest, 3*^ very short. flagellum rather shorter than peduncle. 

 Antenna 2 rather long, ultimate Joint of peduncle nearly twice as long as 

 penultimate, flagellum longer than peduncle. Maxillipeds, palp with rudiment 

 of a blunt terminal joint (Thomson). Gnathopod 1, 6*'* joint slender, tapering, 

 finger (in figure) very small. Gnathopod 2, 4*^» joint obtusely prominent, 

 more so in d than in 9 , 5*'' and 6*^ joints considerably longer in 9 than 



M 



