GAMMARm,?:. 22 



tprminntos. Vlvun cxoooding the ])oreion in loii{?th, or at least 

 t (iiialling it (the api)eiulago.s excluded). Last ])air of pleopoda 

 half as long a-s the pleon ; theii" rami long and broad, equal, and 

 spinxilated along their edges. 

 " Length ^ an inch. 



" Hah. Found on muddy bottoms in the circumlittoral zone, Port 

 Jackson, Australia." — iStimjyson. 



32. Gammarus minus. 



Gamniarus minus, Sat/, Journ. Acad. Nat. Set. Philnd. i. p. 37G. 



Gdidrl, Iiircrft'hrafd of ]\[(iss(irhi(sctff;, p. .'^.34. 

 Gammarus miiuinus, White, Cat. Cnt-st. B. M. p. 88, 1847. 



" Eyes reniform. Superior antennae obviously longer than the in- 

 ferior ; flagellum with about twelve articulations ; secondary ap- 

 pendage short, attaining the tip of the second articulation of the 

 flagellum. Body whitish, Avith a few very pale lateral spots. 



" Length ^ths of an inch. 



" Hah. In brooks, under stones." — Say. " Found in ditches and 

 sluggish fresh water, adhering to sticks." — Gould. N. America. 



33. Gammarus plumicornis. 



Gammarus plumicornis, Costa, Rend, del/a licale Accad. delle Scienze 

 di Kapoli, 1853, p. 17(). 



" Antennaj subequal, shorter than the body; the inferior plumose, 

 with, the peduncle a little longer than the peduncle of the superior. 

 Gnathopoda I'obust, subequal, having the propoda oblong-ovate. 

 The posterior segment of the pleon dorsally furnished with fasci- 

 culi of spines. Postenor pair of pleopoda much exceeding the 

 preceding, which are rather short. 



" Length 6 lines . 



" Hab. Naples."— Cos/rt. 



.34. Gammarus obtiisung^s. 



Gammarus nbtusuiigui.s, Costa, Rend, delta Reale Accad. drlle Scienze 

 di Napoli, 1853, p. 170. 



" Having the dorsal surface round, unarmed. Superior antenna^ 

 slender, much longer than the body, flagellum more than double 

 the length of the ])eduncle ; inferior reaching a little beyond half 

 the length of the superior. Gnathopoda subequal, robust ; pro- 

 poda oblong ; dactyla infcriorly serrated. Posterior ])air of pleo- 

 poda not reaching beyond the ])receding. 



" Length 4 lines. 



•• /fah. Naples."— C'o.<!/r<. 



