232 Proceedings of the Royal Society of Victoria. 



differs from it materially in the shape of the prehensile antennae 

 of the male, and the ovisac of the female, and also in some other 

 characters. 



Parartemia zietziana, sp. nov. (Plates XXVIIT., Fig. B, 

 and XXIX.). 



Body slender ; tail greatly elongated, about one-third longer 

 than the cephalon and trunk combined, terminal segment fully 

 twice as long as the preceding one. Cephalon large, as long as 

 tirst four segments of trunk combined. Eyes small and 

 prominent. 



First antennae short. Prehensile antennae of male, as usual, 

 •directed downwards ; first joint with bases coalesced to each 

 other, short, stout, fleshy, subquadangular in frontal outline and 

 widely divergent, so that the distail ends face obliquely outwards, 

 to which are articulated the second joints. These are twice as 

 long as the first joint, of firm consistency and slender cylindric 

 shape, curving but a little inwards, gradually tapering from the 

 base to a finely pointed extremity, and the surface unbroken by 

 a,ny ridges or spines. From the middle of the anterior surface 

 of each basal joint, and directed antei'iorly, arises a prominent 

 immovable spineform process, while from the inner side which 

 faces directly downwards, there is projected a definite ridge 

 ■extending nearly to the distal end of the joint, having the margin 

 concave. The pair of ridges are only separated medianly by a 

 very narrow fissure, and together form a concave space which 

 fits over the back of the female during copulation. The distal 

 angle of each ridge is narrowly rounded and a little produced 

 towards the end of the joint. 



Second antennae of female about the length of the head, 

 obliquely truncated at the end with the inner angle drawn out to 

 an acute point. 



Branchial feet of shape normal to the genus, no difference in 

 the two sexes ; covering plates rather small, gills of about 

 similar size. Endopodite with terminal lobe broad and laterally 

 expanded more or less, those pairs of about the middle area being 

 very much so, side margin meeting the distal end in a broad even 

 curve, and fringed with spiniform setae, the end being only a 



