«656 Jassa 



flagellura with 4 joints, P* the longest, thrice as long as tlie little l-jointed 

 accessoiy flagellum. Antenna 2, flagellum witb 3 joints, 1^* about twice as 

 long as 2*^ and 3^ combiued, 2*^ more than twice as long as 3"^. Gnathopod 1, 

 6*** Joint piriform or oval, palm not defined except by the palmar spines; finger 

 slightly denticulate near the nail. Gnathopod 2 in d, 6*** Joint widening distally, 

 bind margin long, ending in a considerable tooth, the slightly oblique palm 

 having another rather smaller tooth adjacent to this, and after a cavity a 

 hroader tooth near the fiuger-hinge. Gnathopod 2 in 9 smaller than in ö 

 but veiy similar, only that the tooth of the bind margin is less advanced 

 than the adjacent tooth of the palm. Peraeopods 3 — 5 rather more sleuder 

 than in J. pulchella. üropod 3, outer ramus with uncinate apex but without 

 teeth on upper edge. Telson with a seta on each side of acute apex. 

 Colour pale yellow. L. 3 — 5 mm. 



- Bristol Channel (North Devon) ; Irish Sea (Isle of Man) ; Mediterranean ; Black Sea. 



7. J. frequens (Chilton) 1883 Podocerns f., Chilton in : Tr. N. Zealand Inst., 

 /v.U p.85 t. 3 f. 2 I 1884 P. latipes (cj), Chilton in: Tr. N. Zealand Inst., v.l6 p. 258 

 t.l9 f.2a— d 1 1893 P. frequens, P.l, A.DellaYalle in: F. Fl. Neapel, v. 20 p. 447, 448. 



Eyes moderately large, round. Antennae 1 and 2 equal, setose, slender. 

 Antenna 1, 3<^ Joint longer than l^*', as long as 2^, shorter than flagellum; 

 flagellum 8-jointed, accessory flagellum 2- or 3-jointed. Antenna 2, ultimate 

 Joint of peduncle as long as penultimate, shorter than the 8-jointed flagellum; 

 spines at apex of flagellum little curved. Gnathopod 1, h^^ Joint longer 

 tban 6*^, 6*^ narrowly oval; proximal half of finger serrate. Gnathopod 2 

 in cJ, 5*^ Joint short, cup-shaped, 6*^ stout, oblong, the bind margin ending 

 in a Square slightly emarginate process, a little overlapped by the broad 

 proximally seiTate finger; the not very oblique palm having a deep iudent 

 adjacent to process of bind margin. Gnathopod 2 in 9 and probably young ä 

 having 6^*^ Joint without the Square process, but the palm a little concave. 

 Peraeopods 1 — 5 rather stout, especially peraeopod 4, which in the adult d 

 has all the joints expanded, the 2^ — b^^ as broad as long, üropod 3, 

 peduncle stout, narrowing at apex, rami small, slender, nearly naked. 

 Telson with 2 curved spines, and anterior to these 1 or 2 simple setae. 

 L. about 3 mm. 



Lyttelton Harbour [New Zealand]. 



J. ealifornica (Boeek) 1872 Podocerus californicus, A. Boeck in: Forh. Selsk. 

 Christian.. 1871 p.41 1. 1 f. 6 | 1893 P.falcatus (pari), A. Della Valle in: F. Fl. Neapel, 

 «).20 p. 445. 



L. 7 mm. 



North-Pacific (California). 



J. falcata (Mont.) 1808 Cancer (Gammarus) falcatus, Montagu in: Tr. Linn. 

 Sx)C. London, v.9 p. 100 t. 5 f . 2 | 1812 Asiacus f., Pennant, Brit. Zool., ed. 5 vA p.34 j 

 1813/14 Cancer (Gammarus) f., Jassa (pari.)?, Leach in: Edinb. Enc, v. 7 p. 433 ] 1899 

 J. f., A. 0. Walker in : Ann. nat. Hist., ser. 7 v. 3 p. 395 | 1829 — 43 J. pelagica (err., 

 non Leach 1813/14!), Guerin-Meneville, Iconogr. R^gne an., v.2 Crust. t. 27 f. 3; v.3 

 Crust. p. 23. 



Possibly identical with J. dentex (p. 653). The elongate curved finger of gnatho- 

 pod 2 has (in figure) a prominent tooth on the inner margin not far from the finger-hinge. 



English Channel (South Devon). 



