54 Proceedings of the Royal Society of Victoria. 



over the outer face. Dactyl i at about the middle length bearing- 

 a secondary claw and three setae near to its base ; on the outer 

 margin a seta towards the proximal end. In the male the twa 

 pairs of gnathopoda are much more strongly built, the second 

 compared with the first rather longer, and propodus a very little 

 larger ; the second, compared with the female with the basis, 

 shorter, carpus much shorter, being less than two-thirds the 

 length of the propodus, and propodus much larger, in other 

 respects they are subequal. 



Pereiopoda with dactyli of each having a stout tine-pointed 

 spinule on the inner margin at the base of the claw, and near tO' 

 it on the side a seta, also on the outer margin more proximally 

 one, and sometimes two plumose setae. Last three pairs of 

 almost equal length, the penultimate a very little longer than the 

 other two. 



Terminal uropoda of medium length, differing in form in the 

 two sexes. In the female with the outer ramus twice the length 

 of the inner, terminating in a rudimentary joint, outer margin 

 with four, inner with three ridges of spines, and a longitudinal 

 series of plumose setae. Inner ramus lanceolate, outer margin 

 with three equidistant spines, inner with about six plumose setae, 

 apex with four long spinules. In the 7}iale, outer ramus subequal 

 to the female, inner ramus rather longer and of different shape, 

 its inner margin being almost straight and fringed with plumose 

 setae, the outer margin straight for about two-thirds of its length 

 when it is angularly deflected and runs straight to the narrowly 

 rounded apex, and is fringed with about six long spinules. The 

 apex carries a stout spine and a few spinules. 



The telson is cleft to the base, each piece is broadly rounded 

 at the end and furnished with numerous long spinules, also a few 

 on the upper surface. 



Colour. — Spirit specimens white. 



Letigth. — Largest 10 mm. 



Occ?irre7tce. — Yrow-i a little runnel in a fern gully at Monbulk, 

 near Lilydale, Victoria. Altitude about 800ft. In association 

 with Gammarus australis and Atyloides gabrieli (collected by 

 Mr. J. F. Haase). 



Remarks. — This species agrees rather closely with G. australis, 

 but, although inhabiting surface waters, is peculiarly character- 



