BY WILLIAM A. HASWELL, M.A., B.SC. 263 



pair ; the fiagellum 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 six and a half lines. 



Ilab. Tasmania, (M.-M.J 



Leucothoe gracilis, sj). no v. (PL X., fig. 2.) 



Coxa) of the second pereiopoda not deeper than the others. 

 Superior antennae 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 Z. 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. Two anterior pairs of pereiopoda (wanting). 

 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. 



Length five lines. 



Hab. Tasmania, (M.-M.) 



