264 AUSTRALIAN MALACOSTBACA. 



dactylos stout, a row of acute denticles on its inner border. 

 Posterior gnathopoda smaller than the anterior pair ; carpus and 

 propodos subequal, serrated on their ventral border, armed with 

 fasciculi of hairs ; propodos ovate, half as broad as long, palm 

 not defined, nearly transverse ; dactylos stout, about one-third 

 of the length of the propodos, armed on its inner border with a 

 series of acute denticles. Second pair of pereiopoda longer than 

 the first; dactylos in both long, slender. Posterior pleopoda 

 biramous, the rami shorter than those of the preceding pairs, 

 lanceolate, with a few short, nearly straight setae along the 

 borders and at the extremity. Telson large, armed with a few 

 short hairs. Length 3h lines. 



Port Jackson. 



462. Microdeutopus Mortoni. A.M. 



Microdeutopus Mortoni, Haswell, 1. c, p. 339, pi. xxii., fig. 2. 



Anterior gnathopoda large ; meros produced at its inferior and 

 distal angle into a long sharp spine, which reaches beyond the 

 distal extremity of the carpus ; carpus larger than the propodos, 

 oblong, more than twice as long as broad, the upper border 

 convex, the lower straight ; propodos nearly as broad as the 

 carpus at the base, but narrowing slightly distally ; dactylos 

 two-thirds of the length of the propopos, minutely dentate on 

 its inner border. Last pair of pereiopoda longer than the others. 

 Posterior pleopoda short, the rami tipped with setae which are 

 longer and more slender than those on the preceding pairs. 

 Telson conical, tipped with about half-a-dozen seta) similar to 

 those on the posterior pleopoda. Length W in. 



Clark Island, Port Jackson. 



463. Microdeutopus tenuipes. A.M. 

 Microdeutopus tenuipes, Haswell, 1. c, p. 339, pi. xxii., fig. 1. 

 Eyes round. Superior antennae as long as the cephalon and 



first six segments of the pereion ; first segment of the peduncle 

 scarcely as long as the cephalon, second half as long again, and 

 much more slender ; third about one- fifth of the length of the 

 second ; flagellum longer than the peduncle, of about eighteen 

 elongated articuli, each tipped distally above and below with a 

 few short hairs. Inferior antennae about four-fifths of the 



