AUSTRALIAN MALACOSTBACA. 249 



440. Leucothoe diemenensis. 



Leucothoe diemenensis, Haswell, 1. c, p. 262, pi. ix., fig. 5. 



Body broad. Coxa3 of the second pereiopoda rather deeper 

 than the others. Eyes round, large. Superior antennae equal in 

 length to the cephalon and the two first segments of the pereion ; 

 first two segments of the peduncle subequal, last short. Inferior 

 antennae with the peduncle equal in length to that of the superior 

 pair; the flagellum about half the length of the last segment 

 of the peduncle. Anterior gnathopoda large, in form nearly 

 resembling those of L. commensalis. Posterior gnathopoda very 

 large ; carpus closely applied to the propodos, its palmar process 

 nearly half as long as the latter, bifurcate at the extremity ; 

 propodos exceeding in length the cephalon and first three segments 

 of the pereion, long-oval, with two or three denticles towards 

 the proximal end of the palmar border ; dactylos more than half 

 as long as the propodos. Pereiopoda subequal. Sixth pair of 

 pleopoda the longest. Telson lanceolate, acute. Length 6| lines. 



Tasmania (Macleay Museum). 



441. Leucothoe gracilis. 



Leucothoe gracilis, Haswell, 1. c, p. 263, pi. x., fig. 2. 



Coxae of the second pereiopoda not deeper than the others. 

 Superior antenuae equal in length to the cephalon and the two 

 first segments of the pereion ; first joint of the peduncle stout ; 

 second equal to the first in length, but narrow ; third about half 

 the length of the second ; flagellum scarcely so long as the second 

 segment of the peduncle. Peduncle of the inferior antennae equal 

 in length to that of the superior pair ; flagellum shorter than the 

 last segment of the peduncle. Anterior gnathopoda large, hardly 

 distinguishable in form from those of L. commensalis ; carpus 

 equal in length to the cephalon and first two segments of the 

 pereion. Posterior gnathopoda very large, as long as the 

 cephalon and pereion, similar in shape to those of L. commensalis ; 

 propodos equalling in length the cephalon and two first segments 

 of the pereion. Three posterior pairs subequal, very small and 

 weak. Three posterior pairs of pleopoda long ; the fourth and 

 sixth subequal ; the fifth shorter. Telson triangular, pointed. 



Tasmania. 



The two preceding species are perhaps better regarded as local 

 varieties of L. commensalis. 



