AUSTRALIAN MALACOSTEACA. 235 



imperfectly subchelate, First and second pairs of pereiopoda 

 terminating in a styliform dactylos longer than the propodos ; 

 third and fourth pairs terminating in a short curved dactylos 

 directed posteriorly. Three posterior pairs of pleopoda biramous. 

 Telson squamiform, cleft. [S. B.} 



423. Ampelisca Australis. 



Ampellsca Australis, Haswell, 1. c, p. 257, Vol. iii., pi. viii., fig. 3. 



Superior antennas as long as the cephalon and the first segment 

 of the pereion ; first joint of peduncle short, stout ; second 

 longer and narrower ; third not distinguishable from the articuli 

 of the flagellum ; ilagellum slender, composed of elongated 

 articuli. Inferior antennas about twice as long as the superior ; 

 third segment of the peduncle short, stout; fourth narrow and 

 elongated (as long as the cephalon) ; fifth rather shorter than 

 fourth ; flagellum equal in length to the first two segments of 

 the peduncle, of about ten slender articuli. Maxillipedes with 

 the dactylos stout, as long as the propodos ; the plate of the 

 ischium furnished along its inner margin with a series of eight 

 short, broad, compressed spines, succeeded towards the apex by 

 long and slender spines. Gnathopoda non-subchelate ; the 

 anterior pair with the meros, carpus and propodos of nearly 

 equal length, narrow, furnished with long simple hairs ; posterior 

 pair similar, but shorter and slightly stouter ; dactylos two- 

 thirds of the length of the propodos. Two anterior pairs of 

 pereiopoda with the carpus very short, about one-fifth of the 

 length of the meros ; the propodos nearly twice as long as the 

 carpus, narrower ; the dactylos as long as the carpus and 

 propodos, nearly straight. Posterior pereiopoda with the dactylos 

 very small, directed backwards ; meros of the third and fourth 

 pairs shorter than the carpus ; carpus and propodos subequal, 

 fringed with long hairs ; basos of last pair narrower than that 

 of third and fourth, its posterior edge with a blunt projection, 

 armed with long bristles ; the meros very short and broad ; the 

 carpus longer than the meros and slightly narrower ; the propodos 

 shorter than the carpus, narrowed towards the dactylos, which is 

 long, slender and slightly curved. Sixth pair of pleopoda longsr 

 than the fifth pair, with the rami broad-lanceolate, the outer 

 armed on one border, and the inner on both with slender setse, 



