Talitridae 523 



32. Fam. Talitridae 



1813/14 Orchestidae, Leach in: Edinb. P]nc., v.7 p.432 j 1853 0., J. D. Dana in: 

 U. S. expl. Exp., i;. I3ii p. 826, 846 | 1857 Subfam. Talitrmi, A.Costa in: Mem. Acc. 

 Napoli, v.l p. 173 j 1862 Orchestidae, Bäte, Cat. Amphip. Brit. Mus., p. 4 | 1871 0., A. 

 Boeck in: Forh. Selsk. Christian., 1870 p.91 1888 0., T. Stebbing in: Rep.Voy. Challenger, 

 V. 29 p. 602 etc. j 1890 Orchestüdae, G. 0. Sars, Cnist. Norway, v. 1 p. 21 | 1893 Orchestidi, 

 A. Della Valle in: F. Fl. Neapel, c. 20 p. 489. 



Head without pronounced rostrum, mouth-parts stroogly projecting below. 

 Side-plates 2 — 4 ratber large, 5^^ bilobed (side-plates 1 — 4 ofteu with a 

 small backward projection near the top of liiüd mavgin). AntenDa 1 usually 

 mucli shorter thaa antenna 2, without accessorv flagellum. Antenua 2 haviug 

 the basal Joint coalesced with the head. Upper lip large, distally rounded, 

 median line usually prominent. Lower lip without inner lobes. Mandible 

 without palp, otherwise normal. Maxiila 1, inner plate slender, tipped with 

 2 plumose setae, outer plate with 9 apical spines, palp 1-jointed, small, 

 from rudimentary to a length reaching base of spines of outer plate. Maxiila 2, 

 both plates with apical fringe of slender spines, which on the inner plate 

 is bounded by a plumose seta on the inner margin. Gnathopod 2 in the ö 

 either feebly chelate or (more generally) strongly subchelate (Fig. 9G, 97, 99 

 p. 565, 580, 583), in the Q either feebly chelate or subchelate. Uropod 3 

 usually with a Single ramus. Telson (Fig. 98, 100 p. 580, 583) usually short. 



Kepresented on almost all coasts, chiefly between tide-niarks or not far above 

 or below them, but sometinies reaching considerable heights inland; also found at 

 sea, perhaps generally in coniiection with floating objects; of the fresh water forms 

 some found down to considerable depths in lakes, others in streamlets up to very 

 great heights. 



13 genera, 101 accepted species and 45 doubtful. 



Synopsis of genera: 



j Pleopod 3 degraded 2. Gen. Talitroides . . p. 527 



\ Pleopod 3 not degraded — 2. 



{Maxillipeds, 4tJi Joint of palp wanting or quite 

 rudimentary — 3. 

 Maxillipeds, 4tli Joint of palp distinct — 6. 



j Gnathopod 1 simple in the (5 — -4. 

 \ (jnathopod 1 subchelate in the (J — 5. 



l Gnathopod 2 feebly chelate in the cj • • • • 1. Gen. Talitrus . . . p. 524 

 \ Gnathopod 2 strongly subchelate in the S • • 3. Gen. Orchestoidea . p. 527 



Gnathopod 1 (Fig. 93) subchelate in the ? ■ • 4. Gen. Orchestia . . p. 530 

 Gnathopod 1 (Fig. 94) simple in the $ . . . . 5. -Gen. Talorchestia . p. 543 



i Uropod 3, 1-jointed — 7. 



\ Uropod 3 (Fig. 98), not 1-jointed — 8. 



I Telson partially cleft • . . . 6. Gen. Ceina . . . . p. 554 



\ Telson entire 7. Gen. Chiltonia . . p. 555 



I Uropod 3 with two rami — 9. 



\ Uropod 3 (Fig. 98) with one ramus — 10. 



f Telson divided 8. Gen. Parhyale . . . p. 556 



Telson entire 9. Gen. Neobule . . . p. 556 



j Maxillipeds, 4th Joint of palp not unguiform . 10. Gen. Parorchestia . p. 557 

 \ Maxillipeds, 4*^ Joint of palp unguiform — 11. 



I 



