56 Proceedings of the Royal Society of Victoria. 



six and the second and third joints, distally, two or three plumose 

 sensory setae. 



Lower Atitennae.- — The peduncle is a little longer than the 

 flagellurn, the two last joints subequal and clothed thickly with 

 bunches of setae, and, at the distal end of each, two or three 

 plumose sensory setae. There are about 19 joints in the 

 flagellum, which are also thickly setose, but they are not so long 

 or as dense as in G. australis. In the male the last joint of the 

 peduncle, on the inner side, has a row of four calceoli, and one on 

 each of the first six joints of the peduncle. In G. australis there 

 are no calceoli, but G. mortoni, which has relatively shorter 

 antennae, possesses one on each of the first six joints of the 

 flagellum, but none on the peduncle. The former lias longer and 

 more numerous setae than the other two local species. 



Coxnl-plates. — The first three pairs are fringed with spineform 

 setae as in G. australis, but they are not so numerous nor as long 

 as in that species ; each also bears three or four spines on the 

 posterior margin. The fourth is of even depth to its length, and 

 its ventral margin bears only a few setae. 



Branchial and Incubatory Lamellae. — The former are simple 

 and pedunculated, and the latter large and fringed with setae. 



First and Second Pereiopoda. — The first is a little longer than 

 the second, the latter compared with the third being about as 

 long as from the proximal end of the basos to near the limit of 

 the carpus. 



Third, Fourth and Fifth Pereiopoda. — The third and fifth 

 are of equal length and the fourth is a little longer. In G. 

 australis it is relatively longer. The bases of each are ex- 

 panded, that of the third being rather wider than the others, 

 being in the proportion of three-quarters as wide as its length. 

 In lateral outline it is oblong, subquadrate ; the foui'th has the 

 posterior. margin narrowing rather irregularly to the succeeding 

 joint ; the fifth also only differs in the hind margin which is 

 concave, it is irregularly serrate, and besides a fritige of setules 

 bears a rather stout spine at the distal extremity. 



Pleopoda and Uropoda. — These are normal and call for no 

 special mention, the terminal pair and the telson have already 

 been described. 



