Descriptions of some Australian Pliyllopoda. 23 



The mandibles and maxillæ (ibid.) exhibit exactly the same 

 structure as in Limnadia, and need not therefore be de- 

 scribed in detail 



The legs are 17 pairs in number, and exhibit a rather 

 uniform structure, though the posterior pairs rapidly diminish 

 in size. They are composed of the same principal parts as 

 described above in Lepidurus ; but their form is rather different, 

 being much narrower, and also the consistency is more mem- 

 branous. The stem (see fig. 7) or endopodite, does not ex- 

 hibit any distinct segmentation, except in its outermost part, 

 and is quite straight, with the anterior face somewhat convex, 

 the posterior concave. The coxal lobe is well defined, conical 

 in form, and strongly incurved, terminating with 2 small spines 

 and having inside a transverse row of delicate curved setæ. 

 The endites are 5 in number, the 3 proximal ones forming 

 merely slight expansions of the inner edge of the stem, and 

 each being fringed with a double row of slender, ciliated setæ 

 The 4th endite is somewhat more projecting, forming a trian- 

 gular deflexed lobe setous at the tip, and has moreover a 

 transverse roAV of setæ in the middle. At the base of this 

 endite a faint suture may be traced, crossing the stem, and 

 marking off the terminal part from the proximal one. The 

 5th endite is movably articulated to the end of the stem, and 

 has the form of a narrow oblong blade setiferous all round. 

 The epipodite, or gill, issuing from the outer side of the stem, 

 at some distance from its base, is comparatively more fully 

 developed than in Limnadia, though not nearly of such large 

 size as in the American species, E. texana. It has the form 

 of a thin lamella of the usual spongy structure, and of an 

 oblong oval shape, being turned upwards along the outer side 

 of the basal part. The exopodite is represented by a narrow 

 plate issuing with a broad base from the outer edge of the 

 stem, and fringed along its outer edge with a dense row of 

 ciliated setæ. This plate is drawn out at both extremities to 



