2G2 ON ATJSTKALIAN AMPHIPODA. 



internally with, a row of about fifteen short hairs ; dactylos fully 

 one-third of the length of the propodos. Posterior gnathopoda 

 having the distal process of the carpus nearly half as long as the 

 propodos, parallel- sided, incurved ; propodos equalling in length 

 the cephalon and the first three segments of the pereion, rather 

 more than twice as long as broad, with three small teeth and a 

 row of fine serrations on its palmar border, and aconical tooth on 

 the opposite border at the base of the dactylos ; dactylos not quite 

 half as long as the propodos, uniformly curved. Pereiopoda 

 subequal. Three posterior pairs of pleopoda slender, nearly 

 smooth, the protopodite of the fourth pair longer than that of the 

 fifth and sixth, that of the fifth the shortest. Telson elongated ; 

 the apex moderately acute. 



Colour of larger variety brick-red, or greenish, sometimes light 

 pink with innumerable minute crimson dots. 



Length six or seven lines. 



This species is one of the commonest Amphipods in Port 

 Jackson and other parts of the coast of New South "Wales. One 

 variety — the larger — is found in the pharynx of a common large 

 tunicate, scarcely one of which can be opened without one or 

 more of these crustaceans being found in its interior ; it is also 

 common in the cavities of large sponges. 



Another variety, distinguished from the first by its smaller 

 size, the greater slenderness of the pereiopoda, and its mottled- 

 crimson colour, inhabits the pharynx of various transparent simple 

 ascidians, and is also found in other situations. 



Leucothoe diemenensis, sp. nov. (PI. IX., fig. 5.) 



Body broad. Coxae 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 



