580 Hyalella 



elongute joiuts. Antenna 2 slender, more tbuii half as long as body, iiltimate 

 Joint of pedunele long, flagellinn with IH — 15 elongate joints. Gnathopod 1 

 in ö as in H. iuermis (p. 578) but less robust, the H**» Joint scarcely widening 

 to the transverse palm. Gnathopod 2 in d (Fig. 97), 2<* Joint naiTow, 4*^^ 

 with rounded apex, 5*'* with the usual cup-forming fringed lobe, H*^ much 

 louger than broad, basal pavt navrow, rather abruptly widening at the boss 



which defines the oblique, slightly sinuous 



\. palm. Gnathopods 1 and 2 in Q small, 



-^.x\l 4***joint with rounded apex, 6*^^ in gnatho- 



ß'i- jomt ^_^ -TW _ ^,„ .^.^^^ pp^j ^ sliorter than 5*^ but in gnatho- 



/"^ iW pod 2 about as long, in both narrow, 



6"> Joint ---/--- Af ff~7;|. Teisüu oblong, naiTOwest at base, the sliort 



/ ,/i^ M^ palra transverse or slightly teuding to 



^<^'*fy j1 (r " ^™^°*^ ^ Iqytü. an acute angle with the bind margin. 



^ Peraeopods 3 — 5 successively a little 



Fig. 97. Fig. 98. longer, 2^ Joint oval in peraeopods 3 



Gnathopod 2, J. Thopod 3 and telaon. ^^^^ 4 j^^^jj ^-^g^. ^j^ peraeopod 5. 



Flg. 97 & 98. H. meinerti. ,, ' , • 1 i 1 f a 



Lggs and raarsupial plates large. Acces- 

 sory brauchiae on peraeopods 1 — 5, ordinary branchiae not perceived on 

 peraeopod 5. üropods 1 — 3 unusually slender; uropods 1 and 2 with lateral 

 spines on both rami. üropod 3 (Fig. 98) coraparatively long, the tapering 

 ramus rather longer than pedunele, extending considerably beyond the telson. 

 Telson (Fig. 98) oblong oval, with pair of spinules on rounded apex. L. 5 — 6 mm. 



Brazil (Laguna di Espino). 



15. H. warmingi Stebb. 1899 H. w., T. Stebbing in: Tr. Linn. Soc. London, 

 ser. 2 V.7 p.406 t. B2A. 



Body rather robust. Side-plate 6 deeply lobed bebind, Pleon Seg- 

 ment 3, postero-lateral corners a little produced backward, acute. Eyes small, 

 dark, rounded, more tlian the diameter apart. Antenna 1, 2^ Joint little shorter 

 than l^t, 3*^ a little shorter than 2'^, flagellum with 13 joints in c5', 10 in Q . 

 Antenna 2 more than half as long as body, gland-cone prominent, ultimate 

 Joint of pedunele longer than penultimate, flagellum with 19 joints in d, 

 15 in 9 . Maxiila 1, palp minute. Maxillipeds, 4^^^ Joint of palp with curved 

 spine on the blunt end. Gnathopod 1 in d, 5**1 Joint with bulging bind 

 margin fringed. 6**^ shorter, widening with sinuous bind raargin to the trans- 

 verse palm, whicb is defined by a process witbin which the finger closes, 

 an oblique row of spinules on surface. Gnathopod 2 in d, 2*^ Joint not 

 lobed below, 5**' short, the fringed cup-forming process rather long, 6*^ Joint 

 large, oval, palm very oblique, sinuous, foiming 3 lobes, of whicb tbe centre 

 one is broadest, tbe tinger closing at the 3*^ into a pocket, wbich meets tbe 

 bind margin at a well defined angle. Gnathopods 1 and 2 in o similar to 

 gnathopod 1 in d, but smaller, and 6^^ Joint in gnathopod 2 in o rather 

 longer and more slender than in gnathopod 1. Peraeopods 1 — 5 tolerably 

 robust and spinöse. Peraeopod 1 not shorter than peraeopod 2. Peraeo- 

 pods 3 — 5, 2^ Joint broadly oval, subequal in peraeopods 3 and 4, considerably 

 larger in peraeopod 5. Simple accessory branchiae on peraeopods 1 — 4 not 

 so long as principal branchiae. Uropods 1 and 2 with lateral spines on both 

 rami. üropod 3, ramus as long as pedunele. Telson squared at base, then 

 broadly rounded with 2 distant setules on broad apical margin. Colour 

 dusky in spirit. L. 5 — 6 mm. 



Brazil (Lagoa Santa, watercoui'se near Rio de Janeiro). Height 1200 m. 



