CRTTSTACEA. 313 



Leucothoe P crassimana, Kossmarm, Zool. Ergebn. einer Seise rothen 

 Meeres, Malacostraea, p. 131, pL xiii. figs. 9, 10 (1880). 



Leucothoe commensalis, HasweU, Proc. Linn. Soc. N. S. Wales, iv. 

 p. ^61, pi. X. fig. 3 (1880) ; Cat. Austr. Crust, p. 248 (1882), var. 



I refer to this species a single specimen from Port Jackson, 0-5 

 fms. It diifers only in the greater length of the superior antennae 

 from Mr. Haswell's description of L. commensalis, these exceeding 

 in length the head and first four segments of the body. It ranges 

 along the whole eastern coast of Australia, from Thursday Island in 

 the north to Western Port in the south. 



Mr. HasweU describes this as being one of the commonest Amphi- 

 poda of Port Jackson, where it is found within the pharynx of a 

 common large tunicate, in the cavities of large sponges, and in other 

 similar situations. A mutilated specimen is in the Museum collec- 

 tion from this locality, received from J. Brazier, Esq. 



It is not without much hesitation that I unite L. commensalis 

 with the European L. articulosa, yet upon comparison of the 

 Australian specimens of L. commensalis with the specimens from 

 Great Britain and Norway in the British-Museum collection I can 

 detect no difference of specific importance. In one English speci- 

 men the eyes are reddish, in another Australian example reddish 

 black, and in others scarcely any trace of the pigment remains. 

 There are variations in the length of the antennse and in the form 

 of the antero-lateral pwocesses of the first segment of the body, and 

 also in the degree of acuteness of the apex of the carpal process of 

 the second pair of legs, which, however, I cannot connect with the 

 geographical habitat of the individuals examined. As, however, the 

 series the Museum possesses is but small, and there are in the 

 national collection no specimens from localities intermediate between 

 Great Britain and Australia, it may be well to consider Mr. Has- 

 well's species as a variety, since there may be distinctive characters 

 discoverable in the colour of the eyes, or in other minor particulars. 

 The eyes in Abildgaard's original description are described as 

 black. 



Kossmann's species (X. crassimana), from the Eed Sea, is only 

 briefly characterized, but the details figured would seem to show 

 that this species is also identical with or very nearly allied to 

 L. articulosa. 



3. Leucothoe brevidigitata. (Plate XXXIV. fig. A.) 



The body is smooth, dorsally rounded and laterally compressed ; 

 the coxae of the first four legs deep, as in allied forms. Head small, 

 with a very small median rostral lobe, its antero-lateral angles 

 rounded and not much produced. The coxae of the fourth legs are 

 but little longer than the preceding, without any distinct postero- 

 lateral lobe ; they are slightly overlapped by the much shorter coxaB 

 of the fifth legs. There is a very smaU acute tooth at the postero- 

 lateral angles of the first tail-segment ; these angles in the second 



